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Prof. Jun Hong Noh
School of Civil, Environmental and Architectural Engineering, Korea University, Seoul 136-713, Republic of Korea

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0 Solar Cells
0 Photoelectrochemical cells
0 Oxide nanoparticles and thin films
0 Inorganic-organic hybrid crystals
0 Perovskite halides

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Research article
Published: 03 May 2021 in Advanced Functional Materials
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In n‐i‐p halide perovskite solar cells (HPSCs), the development of p‐type oxides is one of the most noteworthy approaches as hole transport materials (HTMs) for long‐term stability and mass production. However, the deposition of oxide HTMs through a solution process over the perovskite layer without damage to the perovskite layer remains a major challenge. Here, the colloidal dispersion of ligand‐off NiO nanoparticles (NPs) to form the HTM overlayer on perovskite using appropriate solvents that do not damage the underlying perovskite layer is reported. Monodispersed NiO NPs are synthesized using oleylamine (OLA) ligands via the solvothermal method, and the OLA ligands are then removed to form ligand‐off NiO NPs. Based on the Hansen solubility theory, appropriate mixed solvents are found for both the dispersion of NiO NPs without ligands and coating without perovskite damage. The colloidal dispersion form a compact and uniform NiO NPs layer of 30 nm thickness on the perovskite layer, allowing n‐SnO2/Halide/p‐NiO HPSCs to be successfully fabricated. The HPSC shows a record power conversion efficiency under one sun illumination for an n‐i‐p oxide/halide/oxide structure and excellent thermal stability maintaining 98% of the initial efficiency for 580 h under 85 °C and 10% relative humidity condition.

ACS Style

So Yeon Park; Se Jin Kim; Jun Hyeok Lee; Min Ju Jeong; Jae Myeong Lee; Hyun Suk Jung; Jun Hong Noh. Tailoring of Ligand‐Off Nanoparticles Inks for Thin p‐Type Oxide Overlayers Formation with Maintaining Intact Halide Perovskite. Advanced Functional Materials 2021, 31, 2100863 .

AMA Style

So Yeon Park, Se Jin Kim, Jun Hyeok Lee, Min Ju Jeong, Jae Myeong Lee, Hyun Suk Jung, Jun Hong Noh. Tailoring of Ligand‐Off Nanoparticles Inks for Thin p‐Type Oxide Overlayers Formation with Maintaining Intact Halide Perovskite. Advanced Functional Materials. 2021; 31 (31):2100863.

Chicago/Turabian Style

So Yeon Park; Se Jin Kim; Jun Hyeok Lee; Min Ju Jeong; Jae Myeong Lee; Hyun Suk Jung; Jun Hong Noh. 2021. "Tailoring of Ligand‐Off Nanoparticles Inks for Thin p‐Type Oxide Overlayers Formation with Maintaining Intact Halide Perovskite." Advanced Functional Materials 31, no. 31: 2100863.

Paper
Published: 02 March 2021 in Energy & Environmental Science
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Halide perovskite solar cells (PSCs) have recently shown a leap forward in performance by reducing the recombination loss at the interface between the perovskite and hole-transporting layers through surface treatment.

ACS Style

Min Ju Jeong; Kyung Mun Yeom; Se Jin Kim; Eui Hyuk Jung; Jun Hong Noh. Spontaneous interface engineering for dopant-free poly(3-hexylthiophene) perovskite solar cells with efficiency over 24%. Energy & Environmental Science 2021, 14, 2419 -2428.

AMA Style

Min Ju Jeong, Kyung Mun Yeom, Se Jin Kim, Eui Hyuk Jung, Jun Hong Noh. Spontaneous interface engineering for dopant-free poly(3-hexylthiophene) perovskite solar cells with efficiency over 24%. Energy & Environmental Science. 2021; 14 (4):2419-2428.

Chicago/Turabian Style

Min Ju Jeong; Kyung Mun Yeom; Se Jin Kim; Eui Hyuk Jung; Jun Hong Noh. 2021. "Spontaneous interface engineering for dopant-free poly(3-hexylthiophene) perovskite solar cells with efficiency over 24%." Energy & Environmental Science 14, no. 4: 2419-2428.

Progress report
Published: 12 February 2021 in Advanced Energy Materials
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Halide perovskite solar cells (HPSCs) contain charge transport layers (CTLs) both above and below the photoactive perovskite layer. These semiconducting CTLs are just as important as the perovskite layer to fully realizing the potential of perovskite materials. In particular, semiconducting oxide overlayer materials (SOOMs) are expected to lower costs and provide better long‐term stability compared to the organic semiconducting materials commonly used for the upper layer. However, SOOM‐based HPSCs are currently less efficient than conventional devices owing to SOOM's deposition constraints imposed by the underlying perovskite layer. This progress report focuses on the recent evolution of SOOM‐based HPSCs by describing the key issues and recent advances in SOOM deposition methods. Finally, remaining challenges and future research directions for SOOMs are discussed to provide guidance toward the commercialization of HPSCs.

ACS Style

Mun Young Woo; Kwang Choi; Jun Hyeok Lee; So Yeon Park; Jun Hong Noh. Recent Progress in the Semiconducting Oxide Overlayer for Halide Perovskite Solar Cells. Advanced Energy Materials 2021, 11, 2003119 .

AMA Style

Mun Young Woo, Kwang Choi, Jun Hyeok Lee, So Yeon Park, Jun Hong Noh. Recent Progress in the Semiconducting Oxide Overlayer for Halide Perovskite Solar Cells. Advanced Energy Materials. 2021; 11 (27):2003119.

Chicago/Turabian Style

Mun Young Woo; Kwang Choi; Jun Hyeok Lee; So Yeon Park; Jun Hong Noh. 2021. "Recent Progress in the Semiconducting Oxide Overlayer for Halide Perovskite Solar Cells." Advanced Energy Materials 11, no. 27: 2003119.

Journal article
Published: 04 January 2021 in Nature Energy
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The solution process has been employed to obtain Ruddlesden–Popper two-dimensional/three-dimensional (2D/3D) halide perovskite bilayers in perovskite solar cells for improving the efficiency and chemical stability; however, the solution process has limitations in achieving thermal stability and designing a proper local electric field for efficient carrier collection due to the formation of a metastable quasi-2D perovskite. Here we grow a stable and highly crystalline 2D (C4H9NH3)2PbI4 film on top of a 3D film using a solvent-free solid-phase in-plane growth, which could result in an intact 2D/3D heterojunction. An enhanced built-in potential is achieved at the 2D/3D heterojunction with a thick 2D film, resulting in high photovoltage in the device. The intact 2D/3D heterojunction endow the devices with an open-circuit voltage of 1.185 V and a certified steady-state efficiency of 24.35%. The encapsulated device retained 94% of its initial efficiency after 1,056 h under the damp heat test (85 °C/85% relative humidity) and 98% after 1,620 h under full-sun illumination. Two-dimensional structures introduced into perovskite solar cells improve performance yet their morphological and dimensional control remains challenging. Jang et al. devise a solid-phase approach to grow phase-pure two-dimensional perovskites over bulk perovskite, which affords greater device efficiency and stability.

ACS Style

Yeoun-Woo Jang; Seungmin Lee; Kyung Mun Yeom; Kiwan Jeong; Kwang Choi; ManSoo Choi; Jun Hong Noh. Intact 2D/3D halide junction perovskite solar cells via solid-phase in-plane growth. Nature Energy 2021, 6, 63 -71.

AMA Style

Yeoun-Woo Jang, Seungmin Lee, Kyung Mun Yeom, Kiwan Jeong, Kwang Choi, ManSoo Choi, Jun Hong Noh. Intact 2D/3D halide junction perovskite solar cells via solid-phase in-plane growth. Nature Energy. 2021; 6 (1):63-71.

Chicago/Turabian Style

Yeoun-Woo Jang; Seungmin Lee; Kyung Mun Yeom; Kiwan Jeong; Kwang Choi; ManSoo Choi; Jun Hong Noh. 2021. "Intact 2D/3D halide junction perovskite solar cells via solid-phase in-plane growth." Nature Energy 6, no. 1: 63-71.

Progress report
Published: 09 September 2020 in Advanced Materials
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Metal halide perovskite (MHP)‐based tandem solar cells are a promising candidate for use in cost‐effective and high‐performance solar cells that can compete with fossil fuels. To understand the research trends for MHP‐based tandem solar cells, a general introduction to single‐junction and multiple‐junction MHP solar cells and the configuration of tandem devices is provided, along with an overview of the recent progress regarding various MHP‐based tandem cells, including MHP/crystalline silicon, MHP/CuInGaS, MHP/organic photovoltaic, MHP/quantum dot, and all‐perovskite tandem cell. Future research directions for MHP‐based tandem solar cells are also discussed.

ACS Style

Kyung Mun Yeom; So Un Kim; Mun Young Woo; Jun Hong Noh; Sang Hyuk Im. Recent Progress in Metal Halide Perovskite‐Based Tandem Solar Cells. Advanced Materials 2020, 32, 1 .

AMA Style

Kyung Mun Yeom, So Un Kim, Mun Young Woo, Jun Hong Noh, Sang Hyuk Im. Recent Progress in Metal Halide Perovskite‐Based Tandem Solar Cells. Advanced Materials. 2020; 32 (51):1.

Chicago/Turabian Style

Kyung Mun Yeom; So Un Kim; Mun Young Woo; Jun Hong Noh; Sang Hyuk Im. 2020. "Recent Progress in Metal Halide Perovskite‐Based Tandem Solar Cells." Advanced Materials 32, no. 51: 1.

Journal article
Published: 16 June 2020 in MRS Bulletin
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The efficiency of halide perovskite solar cells has progressed rapidly through a series of major breakthroughs. Currently, a certified efficiency of 25.2% has been achieved for a solar cell using a polycrystalline thin film. This is the result of having reached 75% of the Shockley–Queisser limit for single-junction solar cells. However, for further improvements, new breakthrough technologies are required. This article reviews the impact of previous breakthrough technologies on the efficiency of halide perovskite solar cells, based on certified efficiencies. We clarify the current status of halide perovskite solar cells and introduce photon recycling as the next technological innovation for higher efficiencies. Photon recycling keeps the photon concentration inside the light-harvesting layer high, and consequently, leads to open-circuit voltages close to the theoretical value. Although photon recycling has not yet been implemented in real halide perovskite solar cells, three key technologies for implementing it are examined.

ACS Style

Seungmin Lee; Kwang Choi; Chang Ha Min; Mun Young Woo; Jun Hong Noh. Photon recycling in halide perovskite solar cells for higher efficiencies. MRS Bulletin 2020, 45, 439 -448.

AMA Style

Seungmin Lee, Kwang Choi, Chang Ha Min, Mun Young Woo, Jun Hong Noh. Photon recycling in halide perovskite solar cells for higher efficiencies. MRS Bulletin. 2020; 45 (6):439-448.

Chicago/Turabian Style

Seungmin Lee; Kwang Choi; Chang Ha Min; Mun Young Woo; Jun Hong Noh. 2020. "Photon recycling in halide perovskite solar cells for higher efficiencies." MRS Bulletin 45, no. 6: 439-448.

Journal article
Published: 11 October 2019 in Acta Materialia
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Halide perovskites attract enormous attention as promising light absorption and emission materials for photovoltaics and optoelectronic applications. Here we report ternary diagrams of the phase, optical bandgap energy (Eg) and photoluminescence intensity of methylammonium lead halide (MAPbX3, where X = I, Br and Cl) perovskites, with three vertices of MAPbI3, MAPbBr3 and MAPbCl3. All the compositions were synthesized via a facile mechanochemical reaction at room temperature, to ensure the desired stoichiometries of the final products. Through structural study on MAPbX3, the phase diagram comprising a single phase region and two multi-phase regions was obtained. In the single phase region, the a-axis lattice constant increases almost linearly with increasing the average size of the X site ions. Interestingly, Eg decreases almost linearly with increasing the average size of the X site ions, giving negligible deviation from Vegard's law. As the result, a certain bandgap value, in the range of 1.55 - 2.9 eV, can be easily designed with infinite numbers of compositions. For the last, the ternary diagram of the photoluminescence intensity reveals the effective compositions for red, green and blue light emission. The comprehensive structural and optical information reported in this study is useful for designing halide perovskites for various applications. In addition, our approach for compositional mapping various characteristics using a solid-state reaction is an efficient and robust way to studying halide perovskites.

ACS Style

Se-Yun Kim; Ho-Chang Lee; Yujin Nam; Yeonghun Yun; Si-Hong Lee; Dong Hoe Kim; Jun Hong Noh; Joon-Hyung Lee; Dae-Hwan Kim; Sangwook Lee; Young-Woo Heo. Ternary diagrams of the phase, optical bandgap energy and photoluminescence of mixed-halide perovskites. Acta Materialia 2019, 181, 460 -469.

AMA Style

Se-Yun Kim, Ho-Chang Lee, Yujin Nam, Yeonghun Yun, Si-Hong Lee, Dong Hoe Kim, Jun Hong Noh, Joon-Hyung Lee, Dae-Hwan Kim, Sangwook Lee, Young-Woo Heo. Ternary diagrams of the phase, optical bandgap energy and photoluminescence of mixed-halide perovskites. Acta Materialia. 2019; 181 ():460-469.

Chicago/Turabian Style

Se-Yun Kim; Ho-Chang Lee; Yujin Nam; Yeonghun Yun; Si-Hong Lee; Dong Hoe Kim; Jun Hong Noh; Joon-Hyung Lee; Dae-Hwan Kim; Sangwook Lee; Young-Woo Heo. 2019. "Ternary diagrams of the phase, optical bandgap energy and photoluminescence of mixed-halide perovskites." Acta Materialia 181, no. : 460-469.

Journal article
Published: 09 October 2019 in The Journal of Physical Chemistry Letters
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Managing defects in SnO2 is critical for improving the power conversion efficiency (PCE) of halide perovskite-based solar cells. However, typically reported SnO2-based perovskite solar cells have inherent defects in the SnO2 layer, which lead to a lower PCE and hysteresis. Here, we report that a dual-coating approach for SnO2 with different annealing temperatures can simultaneously form a SnO2 layer with high crystallinity and uniform surface coverage. Along with these enhanced physical properties, the dual-coated SnO2 layer shows favorable band alignment with a mixed halide perovskite. After careful optimization of the dual-coating method, the average PCE of the perovskite solar cell based on the dual-coated SnO2 layer increases from 18.07 to 19.23% with a best-performing cell of 20.03%. Note that a facile two-step coating and annealing method can open new avenues to develop SnO2-based perovskite solar cells with stabilized and improved photovoltaic performances.

ACS Style

Jung Hwan Lee; Dongguen Shin; Ryan Rhee; Sangeun Yun; Kyung Mun Yeom; Do Hyung Chun; Sunje Lee; Dongho Kim; Yeonjin Yi; Jun Hong Noh; Jong Hyeok Park. Band Alignment Engineering between Planar SnO2 and Halide Perovskites via Two-Step Annealing. The Journal of Physical Chemistry Letters 2019, 10, 6545 -6550.

AMA Style

Jung Hwan Lee, Dongguen Shin, Ryan Rhee, Sangeun Yun, Kyung Mun Yeom, Do Hyung Chun, Sunje Lee, Dongho Kim, Yeonjin Yi, Jun Hong Noh, Jong Hyeok Park. Band Alignment Engineering between Planar SnO2 and Halide Perovskites via Two-Step Annealing. The Journal of Physical Chemistry Letters. 2019; 10 (21):6545-6550.

Chicago/Turabian Style

Jung Hwan Lee; Dongguen Shin; Ryan Rhee; Sangeun Yun; Kyung Mun Yeom; Do Hyung Chun; Sunje Lee; Dongho Kim; Yeonjin Yi; Jun Hong Noh; Jong Hyeok Park. 2019. "Band Alignment Engineering between Planar SnO2 and Halide Perovskites via Two-Step Annealing." The Journal of Physical Chemistry Letters 10, no. 21: 6545-6550.

Journal article
Published: 07 October 2019 in Nature
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Majority and minority carrier properties such as type, density and mobility represent fundamental yet difficult to access parameters governing semiconductor device performance. Obtaining this information simultaneously under light illumination would unlock many critical parameters vital for optoelectronic devices and solar cells, but realizing this goal has remained elusive. Here we demonstrate a carrier-resolved photo-Hall technique that rests on a new equation relating hole–electron Hall mobility difference (ΔμH), Hall coefficient (H) and conductivity (σ): ΔμH = d(σ2H)/dσ. This discovery, together with advances in a.c.-field Hall measurement using a rotating parallel dipole line system, allows us to unlock a host of critical parameters for both majority and minority carriers such as recombination lifetime, diffusion length and recombination coefficient. We successfully apply this technique to a variety of solar absorbers, including high-performance lead-iodide-based perovskites. By mapping the Hall data against varying light intensities, unprecedented simultaneous access to these parameters is demonstrated. This information, buried in the photo-Hall measurement1,2, has been elusive for 140 years since the original discovery of the Hall effect3. Beyond historical significance, the applications of simultaneous majority/minority carrier measurement are broad, including photovoltaics and other optoelectronic devices.

ACS Style

Oki Gunawan; Seong Ryul Pae; Douglas M. Bishop; Yudistira Virgus; Jun Hong Noh; Nam Joong Jeon; Yun Seog Lee; Xiaoyan Shao; Teodor Todorov; David B. Mitzi; Byungha Shin. Carrier-resolved photo-Hall effect. Nature 2019, 575, 151 -155.

AMA Style

Oki Gunawan, Seong Ryul Pae, Douglas M. Bishop, Yudistira Virgus, Jun Hong Noh, Nam Joong Jeon, Yun Seog Lee, Xiaoyan Shao, Teodor Todorov, David B. Mitzi, Byungha Shin. Carrier-resolved photo-Hall effect. Nature. 2019; 575 (7781):151-155.

Chicago/Turabian Style

Oki Gunawan; Seong Ryul Pae; Douglas M. Bishop; Yudistira Virgus; Jun Hong Noh; Nam Joong Jeon; Yun Seog Lee; Xiaoyan Shao; Teodor Todorov; David B. Mitzi; Byungha Shin. 2019. "Carrier-resolved photo-Hall effect." Nature 575, no. 7781: 151-155.

Journal article
Published: 17 August 2019 in ACS Sustainable Chemistry & Engineering
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ACS Style

Woohyeon Kang; Jae-Chan Kim; Jun Hong Noh; Dong-Wan Kim. Waste Liquid-Crystal Display Glass-Directed Fabrication of Silicon Particles for Lithium-Ion Battery Anodes. ACS Sustainable Chemistry & Engineering 2019, 7, 15329 -15338.

AMA Style

Woohyeon Kang, Jae-Chan Kim, Jun Hong Noh, Dong-Wan Kim. Waste Liquid-Crystal Display Glass-Directed Fabrication of Silicon Particles for Lithium-Ion Battery Anodes. ACS Sustainable Chemistry & Engineering. 2019; 7 (18):15329-15338.

Chicago/Turabian Style

Woohyeon Kang; Jae-Chan Kim; Jun Hong Noh; Dong-Wan Kim. 2019. "Waste Liquid-Crystal Display Glass-Directed Fabrication of Silicon Particles for Lithium-Ion Battery Anodes." ACS Sustainable Chemistry & Engineering 7, no. 18: 15329-15338.

Article
Published: 18 June 2019 in Joule
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Summary For commercializing perovskite solar cells (PSCs), moisture-tolerant materials are required because a moisture-free environment cannot be maintained on an actual production line (large scale). Recently, PSCs with efficiency exceeding 22% have been fabricated using Li-doped mesoporous TiO2 as an electron transport layer (ETL). However, the use of Li can negatively influence device stability during the fabrication process under humid air because of its hydroscopic property. Here, we report a strategy for improving processing stability without sacrificing the power conversion efficiency (PCE) under a humid atmospheric environment by employing a mesoporous BaSnO3 as an ETL. Using the mesoporous BSO ETL, we achieved a certified efficiency of 21.3% and stabilized efficiency of 21.7%. Furthermore, the BSO-based PSCs also exhibited better processing stability than Li-doped TiO2-based PSCs under humid air. We believe that this strategy of introducing BSO into PSCs will accelerate the commercialization of PSCs.

ACS Style

Jaehoon Chung; Seong Sik Shin; Geunjin Kim; Nam Joong Jeon; Tae-Youl Yang; Jun Hong Noh; Jangwon Seo. Impact of Electrode Materials on Process Environmental Stability of Efficient Perovskite Solar Cells. Joule 2019, 3, 1977 -1985.

AMA Style

Jaehoon Chung, Seong Sik Shin, Geunjin Kim, Nam Joong Jeon, Tae-Youl Yang, Jun Hong Noh, Jangwon Seo. Impact of Electrode Materials on Process Environmental Stability of Efficient Perovskite Solar Cells. Joule. 2019; 3 (8):1977-1985.

Chicago/Turabian Style

Jaehoon Chung; Seong Sik Shin; Geunjin Kim; Nam Joong Jeon; Tae-Youl Yang; Jun Hong Noh; Jangwon Seo. 2019. "Impact of Electrode Materials on Process Environmental Stability of Efficient Perovskite Solar Cells." Joule 3, no. 8: 1977-1985.

Letter
Published: 27 March 2019 in Nature
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Perovskite solar cells typically comprise electron- and hole-transport materials deposited on each side of a perovskite active layer. So far, only two organic hole-transport materials have led to state-of-the-art performance in these solar cells1: poly(triarylamine) (PTAA)2,3,4,5 and 2,2ʹ,7,7ʹ-tetrakis(N,N-di-p-methoxyphenylamine)-9,9ʹ-spirobifluorene (spiro-OMeTAD)6,7. However, these materials have several drawbacks in terms of commercialization, including high cost8, the need for hygroscopic dopants that trigger degradation of the perovskite layer9 and limitations in their deposition processes10. Poly(3-hexylthiophene) (P3HT) is an alternative hole-transport material with excellent optoelectronic properties11,12,13, low cost8,14 and ease of fabrication15,16,17,18, but so far the efficiencies of perovskite solar cells using P3HT have reached only around 16 per cent19. Here we propose a device architecture for highly efficient perovskite solar cells that use P3HT as a hole-transport material without any dopants. A thin layer of wide-bandgap halide perovskite is formed on top of the narrow-bandgap light-absorbing layer by an in situ reaction of n-hexyl trimethyl ammonium bromide on the perovskite surface. Our device has a certified power conversion efficiency of 22.7 per cent with hysteresis of ±0.51 per cent; exhibits good stability at 85 per cent relative humidity without encapsulation; and upon encapsulation demonstrates long-term operational stability for 1,370 hours under 1-Sun illumination at room temperature, maintaining 95 per cent of the initial efficiency. We extend our platform to large-area modules (24.97 square centimetres)—which are fabricated using a scalable bar-coating method for the deposition of P3HT—and achieve a power conversion efficiency of 16.0 per cent. Realizing the potential of P3HT as a hole-transport material by using a wide-bandgap halide could be a valuable direction for perovskite solar-cell research.

ACS Style

Eui Hyuk Jung; Nam Joong Jeon; Eun Young Park; Chan Su Moon; Tae Joo Shin; Tae-Youl Yang; Jun Hong Noh; Jangwon Seo. Efficient, stable and scalable perovskite solar cells using poly(3-hexylthiophene). Nature 2019, 567, 511 -515.

AMA Style

Eui Hyuk Jung, Nam Joong Jeon, Eun Young Park, Chan Su Moon, Tae Joo Shin, Tae-Youl Yang, Jun Hong Noh, Jangwon Seo. Efficient, stable and scalable perovskite solar cells using poly(3-hexylthiophene). Nature. 2019; 567 (7749):511-515.

Chicago/Turabian Style

Eui Hyuk Jung; Nam Joong Jeon; Eun Young Park; Chan Su Moon; Tae Joo Shin; Tae-Youl Yang; Jun Hong Noh; Jangwon Seo. 2019. "Efficient, stable and scalable perovskite solar cells using poly(3-hexylthiophene)." Nature 567, no. 7749: 511-515.

Research article
Published: 06 March 2019 in ACS Applied Materials & Interfaces
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The development of a scalable fabrication technology for halide perovskite solar cells (HPSCs) is an important challenge to realize their commercialization. In particular, continuous solution-coating processes are needed to produce scalable large-area HPSCs. Herein, we report a single-solution bar-coating process that introduces an intermediate phase stage for large-area CH3NH3PbI3 films with full coverage and smooth morphology using N-cyclohexyl-2-pyrrolidone (CHP) as a mediator. In contrast to the conventional double-solution coating methods that use anti-solvent treatments, the pre-formed uniform intermediate phase in the single-solution bar-coating process enables the formation of highly uniform perovskite films with a 10 cm × 10 cm area even without anti-solvent treatment. The HPSCs fabricated using the resultant single-solution bar-coated perovskite films exhibit superior photovoltaic performance, narrower distribution, and smaller loss with a larger active area compared with devices fabricated using a single-solution spin-coated perovskite film.

ACS Style

YeonKyeong Ju; So Yeon Park; Kyung Mun Yeom; Jun Hong Noh; Hyun Suk Jung. Single-Solution Bar-Coated Halide Perovskite Films via Mediating Crystallization for Scalable Solar Cell Fabrication. ACS Applied Materials & Interfaces 2019, 11, 11537 -11544.

AMA Style

YeonKyeong Ju, So Yeon Park, Kyung Mun Yeom, Jun Hong Noh, Hyun Suk Jung. Single-Solution Bar-Coated Halide Perovskite Films via Mediating Crystallization for Scalable Solar Cell Fabrication. ACS Applied Materials & Interfaces. 2019; 11 (12):11537-11544.

Chicago/Turabian Style

YeonKyeong Ju; So Yeon Park; Kyung Mun Yeom; Jun Hong Noh; Hyun Suk Jung. 2019. "Single-Solution Bar-Coated Halide Perovskite Films via Mediating Crystallization for Scalable Solar Cell Fabrication." ACS Applied Materials & Interfaces 11, no. 12: 11537-11544.

Journal article
Published: 19 February 2019 in Journal of Power Sources
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We report on a simple and efficient process to enhance the performance of perovskite solar cells by using ITO electrodes with a nanoporous surface formed by wet-etching of self-agglomerated Ag nanoparticles. Effective removal of the Ag nanoparticles embedded in the surface of the ITO electrodes result in a nanoporous structure without changing the ITO's sheet resistance (10.17 Ω/square) and optical transmittance (89.08%) at a 550 nm wavelength. Examinations with a scanning electron microscope, a transmission electron microscope, and two-dimensional porous mapping show that the nanoporous ITO surface has an increased contact area with the electron transport layer, which enhanced the carrier extraction efficiency of the perovskite solar cells. Compare to perovskite solar cells fabricated on typical ITO with a flat surface morphology, the perovskite solar cells fabricated on the nanoporous-surface ITO show a higher fill factor of 81.1% and a power conversion efficiency of 20.1%. These results indicate that modified ITO surfaces with nano-scale porosity provide a simple and efficient method to improve the power conversion efficiency of perovskite solar cells without a complicated process.

ACS Style

Jae-Ho Kim; Tae-Yeon Seong; Kwun-Bum Chung; Chan Su Moon; Jun Hong Noh; Hae-Jun Seok; Han-Ki Kim. Transparent Sn-doped In2O3 electrodes with a nanoporous surface for enhancing the performance of perovskite solar cells. Journal of Power Sources 2019, 418, 152 -161.

AMA Style

Jae-Ho Kim, Tae-Yeon Seong, Kwun-Bum Chung, Chan Su Moon, Jun Hong Noh, Hae-Jun Seok, Han-Ki Kim. Transparent Sn-doped In2O3 electrodes with a nanoporous surface for enhancing the performance of perovskite solar cells. Journal of Power Sources. 2019; 418 ():152-161.

Chicago/Turabian Style

Jae-Ho Kim; Tae-Yeon Seong; Kwun-Bum Chung; Chan Su Moon; Jun Hong Noh; Hae-Jun Seok; Han-Ki Kim. 2019. "Transparent Sn-doped In2O3 electrodes with a nanoporous surface for enhancing the performance of perovskite solar cells." Journal of Power Sources 418, no. : 152-161.

Communication
Published: 16 February 2019 in Energy & Environmental Science
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BaSnO3 is designed as an electron transport layer of high-efficiency perovskite and dye-sensitized solar cells by fine-tuning energy levels through substitution of specific amounts of Sr ions.

ACS Style

Seong Sik Shin; Jae Ho Suk; Bong Joo Kang; Wenping Yin; Seon Joo Lee; Jun Hong Noh; Tae Kyu Ahn; Fabian Rotermund; In Sun Cho; Sang Il Seok. Energy-level engineering of the electron transporting layer for improving open-circuit voltage in dye and perovskite-based solar cells. Energy & Environmental Science 2019, 12, 958 -964.

AMA Style

Seong Sik Shin, Jae Ho Suk, Bong Joo Kang, Wenping Yin, Seon Joo Lee, Jun Hong Noh, Tae Kyu Ahn, Fabian Rotermund, In Sun Cho, Sang Il Seok. Energy-level engineering of the electron transporting layer for improving open-circuit voltage in dye and perovskite-based solar cells. Energy & Environmental Science. 2019; 12 (3):958-964.

Chicago/Turabian Style

Seong Sik Shin; Jae Ho Suk; Bong Joo Kang; Wenping Yin; Seon Joo Lee; Jun Hong Noh; Tae Kyu Ahn; Fabian Rotermund; In Sun Cho; Sang Il Seok. 2019. "Energy-level engineering of the electron transporting layer for improving open-circuit voltage in dye and perovskite-based solar cells." Energy & Environmental Science 12, no. 3: 958-964.

Rapid communication
Published: 31 August 2018 in The Journal of Physical Chemistry Letters
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Halide perovskite solar cells (HPSCs) have a significant potential for future photovoltaic systems because of a high power conversion efficiency (PCE) exceeding 23% using solution processing methods. A low-temperature processed oxide layer is a challenging issue for large-scale manufacture of flexible and low-cost HPSCs. Here, we propose a simple reverse micelle–water injection method for highly dispersed ligand-capped ultrafine SnO2 quantum dots (QD). Interestingly, we observed that the ligands, which help in the formation of a uniform SnO2 QD thin film, spontaneously exchange for halide through a perovskite solution, and finally we form a suitable SnO2 QD–halide junction for high-performance HPSCs. The flexible HPSC with the SnO2 QD–halide junction formed via the ligand exchange exhibits a high PCE of 17.7% using a flexible substrate. It also shows an excellent flexibility, where the initial PCE is maintained within 92% after 1000 bending cycles with a bending radius of 18 mm.

ACS Style

So Yeon Park; Mi Yeon Baek; Yeonkyeon Ju; Dong Hoe Kim; Chan Su Moon; Jun Hong Noh; Hyun Suk Jung. Simultaneous Ligand Exchange Fabrication of Flexible Perovskite Solar Cells using Newly Synthesized Uniform Tin Oxide Quantum Dots. The Journal of Physical Chemistry Letters 2018, 9, 5460 -5467.

AMA Style

So Yeon Park, Mi Yeon Baek, Yeonkyeon Ju, Dong Hoe Kim, Chan Su Moon, Jun Hong Noh, Hyun Suk Jung. Simultaneous Ligand Exchange Fabrication of Flexible Perovskite Solar Cells using Newly Synthesized Uniform Tin Oxide Quantum Dots. The Journal of Physical Chemistry Letters. 2018; 9 (18):5460-5467.

Chicago/Turabian Style

So Yeon Park; Mi Yeon Baek; Yeonkyeon Ju; Dong Hoe Kim; Chan Su Moon; Jun Hong Noh; Hyun Suk Jung. 2018. "Simultaneous Ligand Exchange Fabrication of Flexible Perovskite Solar Cells using Newly Synthesized Uniform Tin Oxide Quantum Dots." The Journal of Physical Chemistry Letters 9, no. 18: 5460-5467.

Research article
Published: 16 August 2018 in ACS Applied Materials & Interfaces
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A highly-durable, highly-flexible transparent electrode (FTE) is developed by applying a composite made of a thin metal grid and a doped conducting polymer onto a colorless-polyimide-coated NOA63 substrate. The proposed FTE exhibits a transparency of 90.7% at 550 nm including the substrate and a sheet resistance of 30.3 Ω/sq and can withstand both moderately high-temperature annealing (~180 °C) and acidic solution (70 °C, pH 0.3) processes without performance degradation. The fabricated FTE yielded good mechanical stability under 10,000 cycles of bending deformations at a bending radius less than 1 mm without degradation of electrical conductivity. The high durability of the proposed FTE allows for the fabrication of flexible energy harvesting devices requiring harsh conditions, such as highly-flexible perovskite solar cells (FPSCs) with a steady state power conversion efficiency (PCE) of 12.7%. Notably, 93% of the original PCE is maintained after 2,000 bending cycles at an extremely small bending radius of 1.5 mm. The FPSCs installed on curved surfaces of commercial devices drives them under various environments. The applicability of the proposed FTE is further confirmed via the fabrication of a flexible perovskite LED. The proposed FTE demonstrates great potential for applications in the field of flexible optoelectronic devices.

ACS Style

Sang Woo Jin; Yong Hui Lee; Kyung Mun Yeom; Junyeong Yun; Heun Park; Yu Ra Jeong; Soo Yeong Hong; Geumbee Lee; Seung Yun Oh; Jin Ho Lee; Jun Hong Noh; Jeong Sook Ha. Highly Durable and Flexible Transparent Electrode for Flexible Optoelectronic Applications. ACS Applied Materials & Interfaces 2018, 10, 30706 -30715.

AMA Style

Sang Woo Jin, Yong Hui Lee, Kyung Mun Yeom, Junyeong Yun, Heun Park, Yu Ra Jeong, Soo Yeong Hong, Geumbee Lee, Seung Yun Oh, Jin Ho Lee, Jun Hong Noh, Jeong Sook Ha. Highly Durable and Flexible Transparent Electrode for Flexible Optoelectronic Applications. ACS Applied Materials & Interfaces. 2018; 10 (36):30706-30715.

Chicago/Turabian Style

Sang Woo Jin; Yong Hui Lee; Kyung Mun Yeom; Junyeong Yun; Heun Park; Yu Ra Jeong; Soo Yeong Hong; Geumbee Lee; Seung Yun Oh; Jin Ho Lee; Jun Hong Noh; Jeong Sook Ha. 2018. "Highly Durable and Flexible Transparent Electrode for Flexible Optoelectronic Applications." ACS Applied Materials & Interfaces 10, no. 36: 30706-30715.

Journals
Published: 04 June 2018 in Journal of Materials Chemistry A
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A fast and large-area-compatible two-step deposition method for perovskite is developed to achieve over 18% for MAPbI3.

ACS Style

Young Yun Kim; Eun Young Park; Tae-Youl Yang; Jun Hong Noh; Tae Joo Shin; Nam Joong Jeon; Jangwon Seo. Fast two-step deposition of perovskite via mediator extraction treatment for large-area, high-performance perovskite solar cells. Journal of Materials Chemistry A 2018, 6, 12447 -12454.

AMA Style

Young Yun Kim, Eun Young Park, Tae-Youl Yang, Jun Hong Noh, Tae Joo Shin, Nam Joong Jeon, Jangwon Seo. Fast two-step deposition of perovskite via mediator extraction treatment for large-area, high-performance perovskite solar cells. Journal of Materials Chemistry A. 2018; 6 (26):12447-12454.

Chicago/Turabian Style

Young Yun Kim; Eun Young Park; Tae-Youl Yang; Jun Hong Noh; Tae Joo Shin; Nam Joong Jeon; Jangwon Seo. 2018. "Fast two-step deposition of perovskite via mediator extraction treatment for large-area, high-performance perovskite solar cells." Journal of Materials Chemistry A 6, no. 26: 12447-12454.

Preprint
Published: 22 February 2018
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Majority and minority carrier properties such as type, density and mobility represent fundamental yet difficult to access parameters governing semiconductor device performance, most notably solar cells. Obtaining this information simultaneously under light illumination would unlock many critical parameters such as recombination lifetime, recombination coefficient, and diffusion length; while deeply interesting for optoelectronic devices, this goal has remained elusive. We demonstrate here a new carrier-resolved photo-Hall technique that rests on a new identity relating hole-electron mobility difference ($\Delta\mu$), Hall coefficient ($h$), and conductivity ($\sigma$): $\Delta\mu=(2+d\ln h/d\ln \sigma)\,h\,\sigma$, and a rotating parallel dipole line ac-field Hall system with Fourier/lock-in detection for clean Hall signal measurement. We successfully apply this technique to recent world-record-quality perovskite and kesterite films and map the results against varying light intensities, demonstrating unprecedented simultaneous access to the above-mentioned parameters.

ACS Style

Oki Gunawan; Seong Ryul Pae; Douglas M. Bishop; Yun Seog Lee; Yudistira Virgus; Nam Joong Jeon; Jun Hong Noh; Xiaoyan Shao; Teodor Todorov; David B. Mitzi; Byungha Shin. Carrier-Resolved Photo Hall Measurement in World-Record-Quality Perovskite and Kesterite Solar Absorbers. 2018, 1 .

AMA Style

Oki Gunawan, Seong Ryul Pae, Douglas M. Bishop, Yun Seog Lee, Yudistira Virgus, Nam Joong Jeon, Jun Hong Noh, Xiaoyan Shao, Teodor Todorov, David B. Mitzi, Byungha Shin. Carrier-Resolved Photo Hall Measurement in World-Record-Quality Perovskite and Kesterite Solar Absorbers. . 2018; ():1.

Chicago/Turabian Style

Oki Gunawan; Seong Ryul Pae; Douglas M. Bishop; Yun Seog Lee; Yudistira Virgus; Nam Joong Jeon; Jun Hong Noh; Xiaoyan Shao; Teodor Todorov; David B. Mitzi; Byungha Shin. 2018. "Carrier-Resolved Photo Hall Measurement in World-Record-Quality Perovskite and Kesterite Solar Absorbers." , no. : 1.

Rapid communication
Published: 17 November 2017 in ACS Energy Letters
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In Sn-based halide perovskite solar cells (PSCs), the oxidation of Sn2+ to Sn4+ under ambient air leads to unwanted p-type doping in the perovskite film, which is a main reason for increased background carrier density and low efficiency. Here, we find that the introduction of bromide into formamidinium tin iodide (CH(NH2)2SnI3, FASnI3) lattice significantly lowers the carrier density of perovskite absorber, which is thought to be a result of reduction of Sn vacancies. It reduces the leakage current of devices, increases recombination lifetime, and finally improves open-circuit voltage and fill factor of the resulting devices employing mesoporous TiO2 as an electron transport layer. Consequently, a high power conversion efficiency (PCE) of 5.5% is achieved with an average PCE of 5%, and after encapsulation the devices are highly stable over 1000 h under continuous one sun illumination including the ultraviolet region. This study suggests a simple approach for improving stability and efficiency in FASnI3-based PSCs.

ACS Style

Seon Joo Lee; Seong Sik Shin; Jino Im; Tae Kyu Ahn; Jun Hong Noh; Nam Joong Jeon; Sang Il Seok; Jangwon Seo. Reducing Carrier Density in Formamidinium Tin Perovskites and Its Beneficial Effects on Stability and Efficiency of Perovskite Solar Cells. ACS Energy Letters 2017, 3, 46 -53.

AMA Style

Seon Joo Lee, Seong Sik Shin, Jino Im, Tae Kyu Ahn, Jun Hong Noh, Nam Joong Jeon, Sang Il Seok, Jangwon Seo. Reducing Carrier Density in Formamidinium Tin Perovskites and Its Beneficial Effects on Stability and Efficiency of Perovskite Solar Cells. ACS Energy Letters. 2017; 3 (1):46-53.

Chicago/Turabian Style

Seon Joo Lee; Seong Sik Shin; Jino Im; Tae Kyu Ahn; Jun Hong Noh; Nam Joong Jeon; Sang Il Seok; Jangwon Seo. 2017. "Reducing Carrier Density in Formamidinium Tin Perovskites and Its Beneficial Effects on Stability and Efficiency of Perovskite Solar Cells." ACS Energy Letters 3, no. 1: 46-53.