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Prof. Jongin Hong
Department of Chemistry, Chung-Ang University, Seoul 06974, Korea

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Research Keywords & Expertise

0 Density Functional Theory
0 Energy Harvesting
0 Nanomaterials
0 Photovoltaics
0 Scanning Probe Microscopy

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Density Functional Theory
Energy Harvesting
smart windows

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Original paper
Published: 22 June 2021 in Journal of the Korean Physical Society
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A neutron beam, generated from a proton beam with an energy of 26.5 MeV, is used to modify the polymer films annealed at different temperatures, and the effects of neutron irradiation on the crystallinity and ordering of the polymer chains and hence the ferroelectric properties of the films are analyzed. The ferroelectric properties are characterized using piezoresponse force microscopy and polarization-voltage measurements. A comparison of the non-irradiated and irradiated P(VDF-TrFE) films shows that the remnant polarization of the irradiated films increases to 17% owing to the microstructural changes induced in them.

ACS Style

Eunhye Shin; Seonhyoung Kim; Jongin Hong; Byung-Hyuk Jun. Effects of neutron irradiation on ferroelectric properties of P(VDF-TrFE) thin films. Journal of the Korean Physical Society 2021, 1 -8.

AMA Style

Eunhye Shin, Seonhyoung Kim, Jongin Hong, Byung-Hyuk Jun. Effects of neutron irradiation on ferroelectric properties of P(VDF-TrFE) thin films. Journal of the Korean Physical Society. 2021; ():1-8.

Chicago/Turabian Style

Eunhye Shin; Seonhyoung Kim; Jongin Hong; Byung-Hyuk Jun. 2021. "Effects of neutron irradiation on ferroelectric properties of P(VDF-TrFE) thin films." Journal of the Korean Physical Society , no. : 1-8.

Journal article
Published: 08 February 2021 in Sustainability
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The concept of smart windows that can change the properties of windows and doors in response to external stimuli has recently been introduced. Smart windows provide superior energy savings and control of indoor environments. This concept can advance sustainable architecture, and it will make it possible to connect with the fourth industry, which has developed recently. However, unlike the relevant hardware, is advancing rapidly, research on methods of adjusting smart windows is slow. Therefore, in this study, an analysis of energy use over time was conducted on electrochromic windows, one of the main types of smart windows. Through this analysis, the optimal properties of electrochromic smart windows were identified, and an operation schedule was created. In addition, energy saving rates were derived through a comparison with existing architectural windows.

ACS Style

Jae-Hyang Kim; Jongin Hong; Seung-Hoon Han. Optimized Physical Properties of Electrochromic Smart Windows to Reduce Cooling and Heating Loads of Office Buildings. Sustainability 2021, 13, 1815 .

AMA Style

Jae-Hyang Kim, Jongin Hong, Seung-Hoon Han. Optimized Physical Properties of Electrochromic Smart Windows to Reduce Cooling and Heating Loads of Office Buildings. Sustainability. 2021; 13 (4):1815.

Chicago/Turabian Style

Jae-Hyang Kim; Jongin Hong; Seung-Hoon Han. 2021. "Optimized Physical Properties of Electrochromic Smart Windows to Reduce Cooling and Heating Loads of Office Buildings." Sustainability 13, no. 4: 1815.

Cover image
Published: 03 February 2021 in Color Research & Application
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The cover image is based on the Research Article Measuring and describing the discoloration of liquid foundation by Yuchun Yan et al., https://doi.org/10.1002/col.22584.

ACS Style

Yuchun Yan; Juhyun Lee; Jongin Hong; Hyeon‐Jeong Suk. Cover Image. Color Research & Application 2021, 46, 1 .

AMA Style

Yuchun Yan, Juhyun Lee, Jongin Hong, Hyeon‐Jeong Suk. Cover Image. Color Research & Application. 2021; 46 (2):1.

Chicago/Turabian Style

Yuchun Yan; Juhyun Lee; Jongin Hong; Hyeon‐Jeong Suk. 2021. "Cover Image." Color Research & Application 46, no. 2: 1.

Full paper
Published: 12 January 2021 in Advanced Materials Interfaces
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Lithium‐rich amorphous Li‐La‐Zr‐O (a‐Li‐La‐Zr‐O) electrolyte is successfully synthesized using sol–gel processing method. With unlimited compositions of the amorphous structure, lithium‐rich compositions are systematically investigated to determine optimal composition and optimized processing conditions of a‐Li‐La‐Zr‐O coatings. There is an improvement in ionic conductivity of a‐Li‐La‐Zr‐O with Li content increasing, specifically from 3.0 × 10−8 S cm−1 (Li8La2Zr2O11) to 1.18 × 10−6 S cm−1 (Li18La2Zr2O16), thereby resulting in low activation energy. The high‐ionic‐conductivity a‐Li‐La‐Zr‐O is implemented as an artificial solid electrolyte interface coating layer on cathode materials. The a‐Li‐La‐Zr‐O‐coated LiCoO2 (LCO) and LiNi0.8Mn0.1Co0.1O2 (NMC 811) coin cells exhibit better cycling performance than the bare coin cell at the optimum compositional ratio of a‐Li‐La‐Zr‐O. A‐Li‐La‐Zr‐O can be a promising material for solid electrolyte battery and a potential coating layer for the modification of cathode surface.

ACS Style

Tan Tan Bui; Boseon Yun; Kwabena Darko; Seung Beom Shin; Jaehyun Kim; Jongin Hong; Minah Lee; Sung Kyu Park; Myung‐Gil Kim. Solution Processing of Lithium‐Rich Amorphous Li‐La‐Zr‐O Ion Conductor and Its Application for Cycling Durability Improvement of LiCoO 2 Cathode as Coating Layer. Advanced Materials Interfaces 2021, 8, 1 .

AMA Style

Tan Tan Bui, Boseon Yun, Kwabena Darko, Seung Beom Shin, Jaehyun Kim, Jongin Hong, Minah Lee, Sung Kyu Park, Myung‐Gil Kim. Solution Processing of Lithium‐Rich Amorphous Li‐La‐Zr‐O Ion Conductor and Its Application for Cycling Durability Improvement of LiCoO 2 Cathode as Coating Layer. Advanced Materials Interfaces. 2021; 8 (5):1.

Chicago/Turabian Style

Tan Tan Bui; Boseon Yun; Kwabena Darko; Seung Beom Shin; Jaehyun Kim; Jongin Hong; Minah Lee; Sung Kyu Park; Myung‐Gil Kim. 2021. "Solution Processing of Lithium‐Rich Amorphous Li‐La‐Zr‐O Ion Conductor and Its Application for Cycling Durability Improvement of LiCoO 2 Cathode as Coating Layer." Advanced Materials Interfaces 8, no. 5: 1.

Research article
Published: 12 October 2020 in Color Research & Application
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Although it is widely known that the foundation color gradually changes over time after applying the makeup, no scientific clues are available, thereby remaining the “darkening” phenomenon equivocal. This study measured the discoloration of liquid foundations and suggested indices to describe the discoloration over time. Four liquid foundations were applied to opacity charts with a thickness of 100 μm, the surface color was obtained using a non‐contact spectrophotometer, and reported in the CIE 1976 L*a*b* color space. A long‐term measurement for 24 hours was conducted in that the initial 2 hours were measured with a 60‐second interval. The discoloration was observed as the decrease of both lightness and hue angle (h* of CIE L*C*h*) of liquid foundation over time. Different degrees and speed of color change were observed across the four foundations. Also, the discoloration was tested on three healthy human skins in 2‐hour intervals in repeated measurements. Positive correlations in changes of lightness and hue were found among the opacity charts and human skin. Furthermore, the study suggests indices, “Dt” and “TΔE” to describe the quantitative amount of discoloration over time and time duration of discoloration, respectively.

ACS Style

Yuchun Yan; Juhyun Lee; Jongin Hong; Hyeon‐Jeong Suk. Measuring and describing the discoloration of liquid foundation. Color Research & Application 2020, 46, 362 -375.

AMA Style

Yuchun Yan, Juhyun Lee, Jongin Hong, Hyeon‐Jeong Suk. Measuring and describing the discoloration of liquid foundation. Color Research & Application. 2020; 46 (2):362-375.

Chicago/Turabian Style

Yuchun Yan; Juhyun Lee; Jongin Hong; Hyeon‐Jeong Suk. 2020. "Measuring and describing the discoloration of liquid foundation." Color Research & Application 46, no. 2: 362-375.

Journal article
Published: 29 August 2020 in Journal of the Korean Physical Society
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For large-scale cathode-material synthesis, the sol-gel process with an atomically mixed metal precursor could provide a facile route to achieve a homogeneously mixed oxide-based cathode material. However, the industrial feasibility of this strategy could be limited by the high preparation cost of the precursors. Although this can be addressed by utilizing low-cost reagents and simplifying the calcination step, typically a trade-off would exist between the cost and the performance. In this study, we demonstrate the facile large-scale synthesis of lithium nickel manganese oxide (LiNi0.5Mn1.5O4) by using a polyvinylpyrrolidone-assisted citric-acid sol-gel combustion method. After single-step calcination at 900 °C for 12 h, the LiNi0.5Mn1.5O4 particles with a truncated octahedron morphology showed a superb discharge capacity (130.8 mAh·g−1) and cyclability (90.9% after 200 cycles).

ACS Style

Boseon Yun; Jongin Hong; Myung-Gil Kim. Large-Scale Synthesis of High Electrochemical Performance LiNi0.5Mn1.5O4 by using a Polyvinylpyrrolidone-Assisted Citric-Acid Sol-Gel Combustion Method. Journal of the Korean Physical Society 2020, 77, 332 -336.

AMA Style

Boseon Yun, Jongin Hong, Myung-Gil Kim. Large-Scale Synthesis of High Electrochemical Performance LiNi0.5Mn1.5O4 by using a Polyvinylpyrrolidone-Assisted Citric-Acid Sol-Gel Combustion Method. Journal of the Korean Physical Society. 2020; 77 (4):332-336.

Chicago/Turabian Style

Boseon Yun; Jongin Hong; Myung-Gil Kim. 2020. "Large-Scale Synthesis of High Electrochemical Performance LiNi0.5Mn1.5O4 by using a Polyvinylpyrrolidone-Assisted Citric-Acid Sol-Gel Combustion Method." Journal of the Korean Physical Society 77, no. 4: 332-336.

Journal article
Published: 14 August 2020 in Solar Energy Materials and Solar Cells
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Since the discovery of the photovoltaic (PV) effect in the 19th century, various PV windows have been developed to improve the energy performance of a building and expand the supply of renewable energy. Dye-sensitized solar cells (DSSCs) have attracted attention as promising alternatives to conventional silicon solar cells because of their transparency and aesthetic value. This study aims to analyze the effect of DSSC windows on the building environment and energy performance and build a database to help architects select appropriate DSSC windows for future zero-energy buildings (ZEBs). We use DesignBuilder, a building energy analysis program, to evaluate indoor illuminance, indoor temperature, cooling and heating energy, lighting energy, and power generation. Our prototype DSSC windows exhibit an improved heat transmission rate (i.e., U-value) but lower visible-light transmission (VLT) than low-emissivity glazing windows; thus, they decrease the heating energy and increase the cooling and lighting energy. We predict that DSSC windows meeting the criteria of 13% power conversion efficiency (PCE) and 30% VLT will achieve energy savings of 4861.44 kWh/yr. PV windows with over 50% VLT with any PCE can be beneficial to net zero-energy and net energy-plus buildings.

ACS Style

Min Hee Chung; Bo Rang Park; Eun Ji Choi; Young Jae Choi; Choonyeob Lee; Jongin Hong; Hye Un Cho; Ji Hyeon Cho; Jin Woo Moon. Performance level criteria for semi-transparent photovoltaic windows based on dye-sensitized solar cells. Solar Energy Materials and Solar Cells 2020, 217, 110683 .

AMA Style

Min Hee Chung, Bo Rang Park, Eun Ji Choi, Young Jae Choi, Choonyeob Lee, Jongin Hong, Hye Un Cho, Ji Hyeon Cho, Jin Woo Moon. Performance level criteria for semi-transparent photovoltaic windows based on dye-sensitized solar cells. Solar Energy Materials and Solar Cells. 2020; 217 ():110683.

Chicago/Turabian Style

Min Hee Chung; Bo Rang Park; Eun Ji Choi; Young Jae Choi; Choonyeob Lee; Jongin Hong; Hye Un Cho; Ji Hyeon Cho; Jin Woo Moon. 2020. "Performance level criteria for semi-transparent photovoltaic windows based on dye-sensitized solar cells." Solar Energy Materials and Solar Cells 217, no. : 110683.

Journal article
Published: 09 May 2020 in Nanomaterials
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Two donor-π-spacer-acceptor (D-π-A) organic dyes were designed as photochromic dyes with the same π-spacer and acceptor but different donors, based on their electron-donating strength. Various structural, electronic, and optical properties, chemical reactivity parameters, and certain crucial factors that affect short-circuit current density (Jsc) and open circuit voltage (Voc) were investigated computationally using density functional theory and time-dependent density functional theory. The trans-cis isomerization of these azobenzene-based dyes and its effect on their properties was studied in detail. Furthermore, the dye-(TiO2)9 anatase nanoparticle system was simulated to understand the electronic structure of the interface. Based on the results, we justified how the trans-cis isomerization and different donor groups influence the physical properties as well as the photovoltaic performance of the resultant dye-sensitized solar cells (DSSCs). These theoretical calculations can be used for the rapid screening of promising dyes and their optimization for photochromic DSSCs.

ACS Style

Al Mamunur Rashid; Dini Hayati; Kyungwon Kwak; Jongin Hong. Theoretical Investigation of Azobenzene-Based Photochromic Dyes for Dye-Sensitized Solar Cells. Nanomaterials 2020, 10, 914 .

AMA Style

Al Mamunur Rashid, Dini Hayati, Kyungwon Kwak, Jongin Hong. Theoretical Investigation of Azobenzene-Based Photochromic Dyes for Dye-Sensitized Solar Cells. Nanomaterials. 2020; 10 (5):914.

Chicago/Turabian Style

Al Mamunur Rashid; Dini Hayati; Kyungwon Kwak; Jongin Hong. 2020. "Theoretical Investigation of Azobenzene-Based Photochromic Dyes for Dye-Sensitized Solar Cells." Nanomaterials 10, no. 5: 914.

Journal article
Published: 11 March 2020 in Nanomaterials
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Pt catalytic nanoparticles on F-doped SnO2/glass substrates were prepared by polyol reduction below 200 °C. The polyol reduction resulted in better transparency of the counter electrode and high power-conversion efficiency (PCE) of the resultant dye-sensitized solar cells (DSSCs) compared to conventional thermal reduction. The PCEs of the DSSCs with 5 μm-thick TiO2 photoanodes were 6.55% and 5.01% under front and back illumination conditions, respectively. The back/front efficiency ratio is very promising for efficient bifacial DSSCs.

ACS Style

Alvien Ghifari; Dang Xuan Long; Seonhyoung Kim; Brian Ma; Jongin Hong. Transparent Platinum Counter Electrode Prepared by Polyol Reduction for Bifacial, Dye-Sensitized Solar Cells. Nanomaterials 2020, 10, 502 .

AMA Style

Alvien Ghifari, Dang Xuan Long, Seonhyoung Kim, Brian Ma, Jongin Hong. Transparent Platinum Counter Electrode Prepared by Polyol Reduction for Bifacial, Dye-Sensitized Solar Cells. Nanomaterials. 2020; 10 (3):502.

Chicago/Turabian Style

Alvien Ghifari; Dang Xuan Long; Seonhyoung Kim; Brian Ma; Jongin Hong. 2020. "Transparent Platinum Counter Electrode Prepared by Polyol Reduction for Bifacial, Dye-Sensitized Solar Cells." Nanomaterials 10, no. 3: 502.

Journal article
Published: 06 February 2020 in Coatings
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The effects of the neutron irradiation treatment on indium-gallium-zinc oxide (IGZO) are investigated as a function of the neutron irradiation time. With an increase in neutron irradiation time, the oxygen vacancies associated the oxygen deficient states increase, and both shallow and deep band edge states below the conduction band also increase. Moreover, the conduction band offset continuously decreases because of the increase in the oxygen vacancies with increasing the neutron irradiation time. In IGZO TFTs with the neutron irradiation time for 10 s, superior device performance demonstrates such as the lower threshold voltage, higher field effect mobility, smaller sub-threshold gate swing, larger on-off current ratio, and improved bias stability, comparing those of other IGZO TFTs.

ACS Style

Sera Kwon; Jongin Hong; Byung-Hyuk Jun; Kwun-Bum Chung. Improvement of Electrical Performance by Neutron Irradiation Treatment on IGZO Thin Film Transistors. Coatings 2020, 10, 147 .

AMA Style

Sera Kwon, Jongin Hong, Byung-Hyuk Jun, Kwun-Bum Chung. Improvement of Electrical Performance by Neutron Irradiation Treatment on IGZO Thin Film Transistors. Coatings. 2020; 10 (2):147.

Chicago/Turabian Style

Sera Kwon; Jongin Hong; Byung-Hyuk Jun; Kwun-Bum Chung. 2020. "Improvement of Electrical Performance by Neutron Irradiation Treatment on IGZO Thin Film Transistors." Coatings 10, no. 2: 147.

Journal article
Published: 29 May 2019 in Materials
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We report the simple synthesis of two organic chromophores featuring an ethynyl-thienothiophene linker with an n-hexyl chain (CSD-03 and CSD-04), their optical and electrochemical properties, and their use as photosensitizers in dye-sensitized solar cells (DSSCs). Our theoretical and experimental studies show that adding the second thienothiophene allows for narrowing the bandgap of the molecule and thus ensuring more light harvesting in the visible region. The efficiencies of both CSD-03 (5.46 ± 0.03%) and CSD-04 (5.20 ± 0.03%) are comparable to that of N719 (5.92 ± 0.01%) in translucent DSSCs fabricated with 5 μm-thick TiO2 photoanodes.

ACS Style

Dong-Suk Lim; Kwang-Won Park; Alan A. Wiles; Jongin Hong. Metal-Free Organic Chromophores Featuring an Ethynyl-Thienothiophene Linker with an n-Hexyl Chain for Translucent Dye-Sensitized Solar Cells. Materials 2019, 12, 1741 .

AMA Style

Dong-Suk Lim, Kwang-Won Park, Alan A. Wiles, Jongin Hong. Metal-Free Organic Chromophores Featuring an Ethynyl-Thienothiophene Linker with an n-Hexyl Chain for Translucent Dye-Sensitized Solar Cells. Materials. 2019; 12 (11):1741.

Chicago/Turabian Style

Dong-Suk Lim; Kwang-Won Park; Alan A. Wiles; Jongin Hong. 2019. "Metal-Free Organic Chromophores Featuring an Ethynyl-Thienothiophene Linker with an n-Hexyl Chain for Translucent Dye-Sensitized Solar Cells." Materials 12, no. 11: 1741.

Journal article
Published: 26 March 2019 in Energies
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The present study sets out to review the thermal and optical properties of electrochromic windows (ECWs) through an analysis of the improvement in the energy performance of a building resulting from their application. The performance analysis was based on the change in the room temperature according to the solar transmittance and the orientation of the ECWs, the energy consumptions of the building’s heating/cooling systems, and that of the building’s lighting according to the visible light transmittance (VLT). To achieve this, the Quick Energy Simulation Tool (eQUEST), a building energy interpretation program, was used. The solar heat gain coefficient (SHGC) of the ECWs was found to be significantly reduced. This had the effect of lowering the room temperature in summer, such that the effect on the summer cooling energy consumption was also remarkable. However, with a reduction in the VLT, the lighting energy consumption increased. The net result of the changes in the heating/cooling and lighting energy consumptions was a reduction of about 11,207 kWh/yr (8.89%). The ECWs were found to realize a greater reduction in a building’s energy consumption than was possible with windows glazed with low-E coated glass.

ACS Style

Bo Rang Park; Jongin Hong; Eun Ji Choi; Young Jae Choi; Choonyeob Lee; Jin Woo Moon. Improvement in Energy Performance of Building Envelope Incorporating Electrochromic Windows (ECWs). Energies 2019, 12, 1181 .

AMA Style

Bo Rang Park, Jongin Hong, Eun Ji Choi, Young Jae Choi, Choonyeob Lee, Jin Woo Moon. Improvement in Energy Performance of Building Envelope Incorporating Electrochromic Windows (ECWs). Energies. 2019; 12 (6):1181.

Chicago/Turabian Style

Bo Rang Park; Jongin Hong; Eun Ji Choi; Young Jae Choi; Choonyeob Lee; Jin Woo Moon. 2019. "Improvement in Energy Performance of Building Envelope Incorporating Electrochromic Windows (ECWs)." Energies 12, no. 6: 1181.

Journal article
Published: 12 March 2019 in Materials
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Coplanar metal-free organic dyes featuring a furylethynyl spacer with different donor residues (MeO-, MeS-, and Me₂N-) have been synthesized. Density functional theory (DFT) calculations predicted that the Me₂N- residue would facilitate more effective charge transfer from donor to acceptor than the MeO- and MeS- residues. In agreement with DFT calculations, the dye-sensitized solar cells (DSSCs) fabricated with the Me₂N- functionalized dye exhibited the best power conversion efficiency (η), 2.88%. Furthermore, the effect of the furan spacer on the photophysical properties and DSSC parameters are discussed in comparison to a previously reported thiophene counterpart.

ACS Style

Luis A. Serrano; Kwang-Won Park; Sungwoo Ahn; Alan A. Wiles; Jongin Hong; Graeme Cooke. Coplanar Donor-π-Acceptor Dyes Featuring a Furylethynyl Spacer for Dye-Sensitized Solar Cells. Materials 2019, 12, 839 .

AMA Style

Luis A. Serrano, Kwang-Won Park, Sungwoo Ahn, Alan A. Wiles, Jongin Hong, Graeme Cooke. Coplanar Donor-π-Acceptor Dyes Featuring a Furylethynyl Spacer for Dye-Sensitized Solar Cells. Materials. 2019; 12 (5):839.

Chicago/Turabian Style

Luis A. Serrano; Kwang-Won Park; Sungwoo Ahn; Alan A. Wiles; Jongin Hong; Graeme Cooke. 2019. "Coplanar Donor-π-Acceptor Dyes Featuring a Furylethynyl Spacer for Dye-Sensitized Solar Cells." Materials 12, no. 5: 839.

Journal article
Published: 18 January 2019 in Nanomaterials
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A series of donor–π-conjugated spacer–acceptor (D–π–A) organic dyes featuring an azobenzene spacer were designed as chromic dyes and investigated computationally. The electron-donating strength was modified by introducing electron-donating units to the donor side. In particular, the trans–cis isomerization of the azobenzene-based dyes and its effect on the optical and electronic properties were further scrutinized. In both trans and cis conformers, a gradual increase in electron-donating strength promoted the natural charge separation between donor and acceptor moieties, thereby allowing the absorption of a longer wavelength of visible light. Importantly, the conformational change of the azobenzene bridge resulted in different absorption spectra and light-harvesting properties. The azobenzene-based dyes will open up a new research path for chromic dye-sensitized solar cells.

ACS Style

Al Mamunur Rashid; Dini Hayati; Kyungwon Kwak; Jongin Hong. Computational Investigation of Tuning the Electron-Donating Ability in Metal-Free Organic Dyes Featuring an Azobenzene Spacer for Dye-Sensitized Solar Cells. Nanomaterials 2019, 9, 119 .

AMA Style

Al Mamunur Rashid, Dini Hayati, Kyungwon Kwak, Jongin Hong. Computational Investigation of Tuning the Electron-Donating Ability in Metal-Free Organic Dyes Featuring an Azobenzene Spacer for Dye-Sensitized Solar Cells. Nanomaterials. 2019; 9 (1):119.

Chicago/Turabian Style

Al Mamunur Rashid; Dini Hayati; Kyungwon Kwak; Jongin Hong. 2019. "Computational Investigation of Tuning the Electron-Donating Ability in Metal-Free Organic Dyes Featuring an Azobenzene Spacer for Dye-Sensitized Solar Cells." Nanomaterials 9, no. 1: 119.

Journal article
Published: 06 September 2018 in Journal of the Korean Physical Society
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Cubic BaTiO3 (C-BT) and tetragonal BaTiO3 (T1-BT) nanoparticles were prepared by a solvothermal method with controlling the Ba/Ti precursor ratio. Triethanolamine was additionally employed in the synthesis to obtain ferroelectric BaTiO3 with improved particle size distribution and tetragonality (T2-BT). The prepared nanoparticles were thoroughly characterized by scanning electron microscopy, transmission electron microscopy, Brunauer-Emmett-Teller analysis, X-ray diffraction, X-ray photoelectron spectroscopy, ultraviolet-visible spectroscopy, photoluminescence, and second-harmonic generation. Importantly, the BaTiO3 nanoparticles were introduced into the scattering layer of dye-sensitized solar cells and T2-BT showed better power conversion efficiency than C-BT and T1-BT.

ACS Style

Ming Hao Jin; Eunhye Shin; Saera Jin; Hongil Jo; Kang Min Ok; Jongin Hong; Byung-Hyuk Jun; James R. Durrant. Solvothermal Synthesis of Ferroelectric BaTiO3 Nanoparticles and Their Application to Dye-sensitized Solar Cells. Journal of the Korean Physical Society 2018, 73, 627 -631.

AMA Style

Ming Hao Jin, Eunhye Shin, Saera Jin, Hongil Jo, Kang Min Ok, Jongin Hong, Byung-Hyuk Jun, James R. Durrant. Solvothermal Synthesis of Ferroelectric BaTiO3 Nanoparticles and Their Application to Dye-sensitized Solar Cells. Journal of the Korean Physical Society. 2018; 73 (5):627-631.

Chicago/Turabian Style

Ming Hao Jin; Eunhye Shin; Saera Jin; Hongil Jo; Kang Min Ok; Jongin Hong; Byung-Hyuk Jun; James R. Durrant. 2018. "Solvothermal Synthesis of Ferroelectric BaTiO3 Nanoparticles and Their Application to Dye-sensitized Solar Cells." Journal of the Korean Physical Society 73, no. 5: 627-631.

Short communication
Published: 30 July 2018 in Materials Letters
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We have developed time-resolved fractal dimension analysis in ferroelectric copolymer films in order to understand the effect of polarization relaxation on domain wall roughness. Interestingly, the progressive polarization relaxation of irregular domains results from the domain back reversal at the boundaries where the antiparallel polarization encounters, and therefore has a significant influence on the fractal dimension of the irregular domains as a function of time.

ACS Style

Seonhyoung Kim; Kwang-Won Park; Ho-Young Woo; Jongin Hong. Time-resolved fractal dimension analysis in ferroelectric copolymer thin films using R-based image processing. Materials Letters 2018, 230, 195 -198.

AMA Style

Seonhyoung Kim, Kwang-Won Park, Ho-Young Woo, Jongin Hong. Time-resolved fractal dimension analysis in ferroelectric copolymer thin films using R-based image processing. Materials Letters. 2018; 230 ():195-198.

Chicago/Turabian Style

Seonhyoung Kim; Kwang-Won Park; Ho-Young Woo; Jongin Hong. 2018. "Time-resolved fractal dimension analysis in ferroelectric copolymer thin films using R-based image processing." Materials Letters 230, no. : 195-198.

Journal article
Published: 20 July 2018 in Thin Solid Films
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Numerous LiCoO2 cathode thin-films have been prepared for all-solid-state thin-film battery applications. Preparation methods include sputtering, pulsed laser deposition, electron beam evaporation, screen printing, and spin coating. When compared to vacuum deposition methods, the solution-processed fabrication methods could result in significant cost savings and large-area production. Unfortunately, high-temperature annealing (Tanneal > 700 °C) of LiCoO2 cathode thin film is usually crucial for achieving a high performance layered phase. Here, we report on phase control of spin-coated LiCoO2 thin film by varying the molecular weight of polyvinylpyrrolidone (PVP) at low temperature. We could achieve thick and smooth film morphology by optimizing the PVP molecular weight. This method could be a promising cathode layer for low-cost thin-film batteries.

ACS Style

Seungwoo Yu; Chahwan Hwang; Do Jeon Kim; Joohyung Park; Seonhyoung Kim; Jongin Hong; Jihyun An; Tae Hoon Lee; Myung-Gil Kim. Characterization of low-temperature solution-processed LiCoO2 thin-film cathode with molecular weight control of polyvinylpyrrolidone. Thin Solid Films 2018, 661, 46 -52.

AMA Style

Seungwoo Yu, Chahwan Hwang, Do Jeon Kim, Joohyung Park, Seonhyoung Kim, Jongin Hong, Jihyun An, Tae Hoon Lee, Myung-Gil Kim. Characterization of low-temperature solution-processed LiCoO2 thin-film cathode with molecular weight control of polyvinylpyrrolidone. Thin Solid Films. 2018; 661 ():46-52.

Chicago/Turabian Style

Seungwoo Yu; Chahwan Hwang; Do Jeon Kim; Joohyung Park; Seonhyoung Kim; Jongin Hong; Jihyun An; Tae Hoon Lee; Myung-Gil Kim. 2018. "Characterization of low-temperature solution-processed LiCoO2 thin-film cathode with molecular weight control of polyvinylpyrrolidone." Thin Solid Films 661, no. : 46-52.

Journal article
Published: 01 July 2018 in Applied Thermal Engineering
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ACS Style

Bo Rang Park; Eun Ji Choi; Jongin Hong; Je Hyeon Lee; Jin Woo Moon. Development of an energy cost prediction model for a VRF heating system. Applied Thermal Engineering 2018, 140, 476 -486.

AMA Style

Bo Rang Park, Eun Ji Choi, Jongin Hong, Je Hyeon Lee, Jin Woo Moon. Development of an energy cost prediction model for a VRF heating system. Applied Thermal Engineering. 2018; 140 ():476-486.

Chicago/Turabian Style

Bo Rang Park; Eun Ji Choi; Jongin Hong; Je Hyeon Lee; Jin Woo Moon. 2018. "Development of an energy cost prediction model for a VRF heating system." Applied Thermal Engineering 140, no. : 476-486.

Full paper
Published: 21 December 2017 in Advanced Electronic Materials
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Here, the preparation of transparent amorphous oxide semiconductor (AOS) films with unprecedented conductivity via an optimized activation process under hydrogen atmosphere for applications in solution‐processed large‐area optoelectronics is reported. Owing to their high cost and mechanical vulnerability, conventional vacuum‐processed indium–tin oxide (ITO) electrodes are inappropriate for use in next‐generation flexible and wearable electronic devices and systems. As an alternative to the ITO electrodes, solution‐processed AOS films, such as a‐IZO and a‐ZITO, with an optimized composition and postreduction treatment under hydrogen show the highest electrical conductivity of ≈300 S cm−1 and a high optical transmittance of over 90% at 550 nm. The microstructures and electrical properties of these AOS films are also studied in order to determine the optimized chemical composition and postreduction conditions. It is found that a controlled hydrogen reduction treatment of AOS films is critical for achieving high electrical conductivity by suppressing the surface morphology degradation and grain boundary disconnection. Furthermore, the a‐IZO transparent conductive electrodes are successfully implemented for high efficiency organic photovoltaic cells based on the PTB7/PC71BM active layers. This technique promises the low‐cost fabrication of high mobility and/or conductive AOSs for their applications in large‐area transparent and flexible optoelectronics.

ACS Style

Byung Doo Choi; Joohyung Park; Kang-Jun Baeg; Minji Kang; Jae Sang Heo; Seonhyoung Kim; Jongkook Won; Seungwoo Yu; Kyunghan Ahn; Tae Hoon Lee; Jongin Hong; Dong-Yu Kim; Hakan Usta; Choongik Kim; Sung Kyu Park; Myung-Gil Kim. Optimized Activation of Solution-Processed Amorphous Oxide Semiconductors for Flexible Transparent Conductive Electrodes. Advanced Electronic Materials 2017, 4, 1 .

AMA Style

Byung Doo Choi, Joohyung Park, Kang-Jun Baeg, Minji Kang, Jae Sang Heo, Seonhyoung Kim, Jongkook Won, Seungwoo Yu, Kyunghan Ahn, Tae Hoon Lee, Jongin Hong, Dong-Yu Kim, Hakan Usta, Choongik Kim, Sung Kyu Park, Myung-Gil Kim. Optimized Activation of Solution-Processed Amorphous Oxide Semiconductors for Flexible Transparent Conductive Electrodes. Advanced Electronic Materials. 2017; 4 (1):1.

Chicago/Turabian Style

Byung Doo Choi; Joohyung Park; Kang-Jun Baeg; Minji Kang; Jae Sang Heo; Seonhyoung Kim; Jongkook Won; Seungwoo Yu; Kyunghan Ahn; Tae Hoon Lee; Jongin Hong; Dong-Yu Kim; Hakan Usta; Choongik Kim; Sung Kyu Park; Myung-Gil Kim. 2017. "Optimized Activation of Solution-Processed Amorphous Oxide Semiconductors for Flexible Transparent Conductive Electrodes." Advanced Electronic Materials 4, no. 1: 1.

Journal article
Published: 12 October 2017 in Nanomaterials
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TiO2 nanowire networks were prepared, using the corrosion of Ti foils in alkaline (potassium hydroxide, KOH) solution at different temperatures, and then a further ion-exchange process. The prepared nanostructures were characterized by field emission scanning electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy. The wet corroded foils were utilized as the photoanodes of bendable dye-sensitized solar cells (DSSCs), which exhibited a power conversion efficiency of 1.11% under back illumination.

ACS Style

Saera Jin; Eunhye Shin; Jongin Hong. TiO2 Nanowire Networks Prepared by Titanium Corrosion and Their Application to Bendable Dye-Sensitized Solar Cells. Nanomaterials 2017, 7, 315 .

AMA Style

Saera Jin, Eunhye Shin, Jongin Hong. TiO2 Nanowire Networks Prepared by Titanium Corrosion and Their Application to Bendable Dye-Sensitized Solar Cells. Nanomaterials. 2017; 7 (10):315.

Chicago/Turabian Style

Saera Jin; Eunhye Shin; Jongin Hong. 2017. "TiO2 Nanowire Networks Prepared by Titanium Corrosion and Their Application to Bendable Dye-Sensitized Solar Cells." Nanomaterials 7, no. 10: 315.