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Two wide-bandgap copolymer donors, W4 and W5, based on mono-fluorine- and mono-alkoxyl-substituted benzene units were developed. W4 and W5 were synthesized from cheap and commercially available starting materials. Organic solar cells based on W4 and W5 gave decent power conversion efficiencies of up to 15.25%.
Liming Ding; Jingui Xu; An Xin Sun; Zuo Xiao; Ergang Wang; Bin Zhang; Yong Hua. Efficient wide-bandgap copolymer donors with reduced synthesis cost. Journal of Materials Chemistry C 2021, 1 .
AMA StyleLiming Ding, Jingui Xu, An Xin Sun, Zuo Xiao, Ergang Wang, Bin Zhang, Yong Hua. Efficient wide-bandgap copolymer donors with reduced synthesis cost. Journal of Materials Chemistry C. 2021; ():1.
Chicago/Turabian StyleLiming Ding; Jingui Xu; An Xin Sun; Zuo Xiao; Ergang Wang; Bin Zhang; Yong Hua. 2021. "Efficient wide-bandgap copolymer donors with reduced synthesis cost." Journal of Materials Chemistry C , no. : 1.
In this article combining density functional theory (DFT) calculations and corresponding experimental measurements, the adsorption behaviors and working mechanism of the alcohol-soluble ionic organic interlayer on different electrode substrates were studied. The results suggest that, when the ionic organic bipyridine salt interlayer (FPyBr) is adsorbed on the Ag surface, Br– will break away from molecule chains and form new chemical bonds with the Ag substrate, as confirmed by both the X-ray photoelectron spectroscopy (XPS) study and DFT study for the first time. Charges are further found to transfer to the Ag substrate from the new interlayer molecular structure without Br–, resulting in adsorption dipoles directed from Ag to the interlayer. Moreover, the direction of the intrinsic dipole of the molecule itself on the Ag substrate is also verified, which is the same as that of the adsorption dipole. Subsequently, the superposition of the two dipoles results in a large reduction of the Ag substrate work function. In addition, the dipole formation mechanism of the interlayer on the ITO surface was also studied. The change in the work function of the ITO substrate by this interlayer is found to be smaller than that of Ag as confirmed by both a DFT study and scanning Kelvin probe microscopy (SKPM) results, which is mainly due to the reversed direction of the molecular intrinsic dipole with respect to the interfacial dipole. The worst device performance of organic solar cells based on the ITO-FPyBr substrate is considered to be one of the consequences of the feature. The findings here are of great importance for the study of the mechanism of the ionic organic interlayer in organic electronic devices, providing insightful understandings on how to further improve the material and device performance.
Chuang Feng; Xiaojing Wang; Guiting Chen; Bin Zhang; Zhicai He; Yong Cao. Mechanism of the Alcohol-Soluble Ionic Organic Interlayer in Organic Solar Cells. Langmuir 2021, 37, 4347 -4354.
AMA StyleChuang Feng, Xiaojing Wang, Guiting Chen, Bin Zhang, Zhicai He, Yong Cao. Mechanism of the Alcohol-Soluble Ionic Organic Interlayer in Organic Solar Cells. Langmuir. 2021; 37 (14):4347-4354.
Chicago/Turabian StyleChuang Feng; Xiaojing Wang; Guiting Chen; Bin Zhang; Zhicai He; Yong Cao. 2021. "Mechanism of the Alcohol-Soluble Ionic Organic Interlayer in Organic Solar Cells." Langmuir 37, no. 14: 4347-4354.
The novel and appropriate molecular design for polymer donors are playing an important role in realizing high-efficiency and high stable polymer solar cells (PSCs). In this work, four conjugated polymers (PIDT-O, PIDTT-O, PIDT-S and PIDTT-S) with indacenodithiophene (IDT) and indacenodithieno [3,2-b]thiophene (IDTT) as the donor units, and alkoxy-substituted benzoxadiazole and benzothiadiazole derivatives as the acceptor units have been designed and synthesized. Taking advantages of the molecular engineering on polymer backbones, these four polymers showed differently photophysical and photovoltaic properties. They exhibited wide optical bandgaps of 1.88, 1.87, 1.89 and 1.91 eV and quite impressive hole mobilities of 6.01 × 10−4, 7.72 × 10−4, 1.83 × 10−3, and 1.29 × 10−3 cm2 V−1 s−1 for PIDT-O, PIDTT-O, PIDT-S and PIDTT-S, respectively. Through the photovoltaic test via using PIDT-O, PIDTT-O, PIDT-S and PIDTT-S as donor materials and [6,6]-phenyl-C-71-butyric acid methyl ester (PC71BM) as acceptor materials, all the PSCs presented the high open circuit voltages (Vocs) over 0.85 V, whereas the PIDT-S and PIDTT-S based devices showed higher power conversion efficiencies (PCEs) of 5.09% and 4.43%, respectively. Interestingly, the solvent vapor annealing (SVA) treatment on active layers could improve the fill factors (FFs) extensively for these four polymers. For PIDT-S and PIDTT-S, the SVA process improved the FFs exceeding 71%, and ultimately the PCEs were increased to 6.05%, and 6.12%, respectively. Therefore, this kind of wide band-gap polymers are potentially candidates as efficient electron-donating materials for constructing high-performance PSCs.
Siyang Liu; Shuwang Yi; Peiling Qing; Tersilla Virgili; Bin Gu; Zhicai He; Bin Zhang. Molecular Engineering Enhances the Charge Carriers Transport in Wide Band-Gap Polymer Donors Based Polymer Solar Cells. Molecules 2020, 25, 4101 .
AMA StyleSiyang Liu, Shuwang Yi, Peiling Qing, Tersilla Virgili, Bin Gu, Zhicai He, Bin Zhang. Molecular Engineering Enhances the Charge Carriers Transport in Wide Band-Gap Polymer Donors Based Polymer Solar Cells. Molecules. 2020; 25 (18):4101.
Chicago/Turabian StyleSiyang Liu; Shuwang Yi; Peiling Qing; Tersilla Virgili; Bin Gu; Zhicai He; Bin Zhang. 2020. "Molecular Engineering Enhances the Charge Carriers Transport in Wide Band-Gap Polymer Donors Based Polymer Solar Cells." Molecules 25, no. 18: 4101.
Fused-ring bislactone units yield decent polymer donors, which gave high open-circuit voltages in organic solar cells, demonstrating the potential of bislactone building blocks. Download : Download high-res image (73KB)Download : Download full-size image
Ji Xiong; Jingui Xu; Yufan Jiang; Zuo Xiao; Qinye Bao; Feng Hao; Yaqing Feng; Bin Zhang; Zhiwen Jin; Liming Ding. Fused-ring bislactone building blocks for polymer donors. Science Bulletin 2020, 65, 1792 -1795.
AMA StyleJi Xiong, Jingui Xu, Yufan Jiang, Zuo Xiao, Qinye Bao, Feng Hao, Yaqing Feng, Bin Zhang, Zhiwen Jin, Liming Ding. Fused-ring bislactone building blocks for polymer donors. Science Bulletin. 2020; 65 (21):1792-1795.
Chicago/Turabian StyleJi Xiong; Jingui Xu; Yufan Jiang; Zuo Xiao; Qinye Bao; Feng Hao; Yaqing Feng; Bin Zhang; Zhiwen Jin; Liming Ding. 2020. "Fused-ring bislactone building blocks for polymer donors." Science Bulletin 65, no. 21: 1792-1795.
The correlation between molecular packing structure and its room-temperature phosphorescence (RTP), hence rational promotion of the intensity, remains unclear. We herein present racemism enhanced RTP chiral chromophores by 2,2-bis-(diphenylphosphino)-1,1-napthalene (rac-BINAP) in comparison to its chiral counterparts. The result shows that rac-BINAP in crystal with denser density, consistent with a long standing Wallach’s rule, exhibits deeper red RTP at 680 nm than that of the chiral counterparts. The cross packing between alternative R- and S- forms in rac-BINAP crystal significantly retards the bimolecular quenching pathway, triplet-triplet annihilation (TTA), and hence suppresses the non-radiative pathway, boosting the RTP intensity. The result extends the Wallach’s rule to the fundamental difference in chiral-photophysics. In electroluminescence, rac-BINAP exhibits more balanced fluorescence versus phosphorescence intensity by comparison with that of photoluminescence, rendering a white-light emission. The result paves an avenue en route for white-light organic light emitting diodes via full exploitation of intrinsic fluorescence and phosphorescence.
Xiugang Wu; Chun-Ying Huang; Deng-Gao Chen; DengHui Liu; Chichi Wu; Keh-Jiunh Chou; Bin Zhang; Yafei Wang; Yu Liu; Elise Y. Li; Weiguo Zhu; Pi-Tai Chou. Exploiting racemism enhanced organic room-temperature phosphorescence to demonstrate Wallach’s rule in the lighting chiral chromophores. Nature Communications 2020, 11, 1 -10.
AMA StyleXiugang Wu, Chun-Ying Huang, Deng-Gao Chen, DengHui Liu, Chichi Wu, Keh-Jiunh Chou, Bin Zhang, Yafei Wang, Yu Liu, Elise Y. Li, Weiguo Zhu, Pi-Tai Chou. Exploiting racemism enhanced organic room-temperature phosphorescence to demonstrate Wallach’s rule in the lighting chiral chromophores. Nature Communications. 2020; 11 (1):1-10.
Chicago/Turabian StyleXiugang Wu; Chun-Ying Huang; Deng-Gao Chen; DengHui Liu; Chichi Wu; Keh-Jiunh Chou; Bin Zhang; Yafei Wang; Yu Liu; Elise Y. Li; Weiguo Zhu; Pi-Tai Chou. 2020. "Exploiting racemism enhanced organic room-temperature phosphorescence to demonstrate Wallach’s rule in the lighting chiral chromophores." Nature Communications 11, no. 1: 1-10.
Green fabrication, including green materials and green solvents, is an attractive technique in organic electronics.
Xiaojing Wang; Shuwang Yi; Zhicai He; Xinhua Ouyang; Hong-Bin Wu; Weiguo Zhu; Bin Zhang; Yong Cao. An environmentally friendly natural polymer as a universal interfacial modifier for fullerene and non-fullerene polymer solar cells. Sustainable Energy & Fuels 2019, 4, 1234 -1241.
AMA StyleXiaojing Wang, Shuwang Yi, Zhicai He, Xinhua Ouyang, Hong-Bin Wu, Weiguo Zhu, Bin Zhang, Yong Cao. An environmentally friendly natural polymer as a universal interfacial modifier for fullerene and non-fullerene polymer solar cells. Sustainable Energy & Fuels. 2019; 4 (3):1234-1241.
Chicago/Turabian StyleXiaojing Wang; Shuwang Yi; Zhicai He; Xinhua Ouyang; Hong-Bin Wu; Weiguo Zhu; Bin Zhang; Yong Cao. 2019. "An environmentally friendly natural polymer as a universal interfacial modifier for fullerene and non-fullerene polymer solar cells." Sustainable Energy & Fuels 4, no. 3: 1234-1241.
A series of solution-processible blue small molecules based on bis(benzothiophene-S,S-dioxide) fused polycyclic aromatics (FBTO) are synthesized, which show the high EL performance with the maximum current efficiency of 6.37 cd A−1.
Liwen Hu; Siyang Liu; Guohua Xie; Wei Yang; Bin Zhang. Bis(benzothiophene-S,S-dioxide) fused small molecules realize solution-processible, high-performance and non-doped blue organic light-emitting diodes. Journal of Materials Chemistry C 2019, 8, 1002 -1009.
AMA StyleLiwen Hu, Siyang Liu, Guohua Xie, Wei Yang, Bin Zhang. Bis(benzothiophene-S,S-dioxide) fused small molecules realize solution-processible, high-performance and non-doped blue organic light-emitting diodes. Journal of Materials Chemistry C. 2019; 8 (3):1002-1009.
Chicago/Turabian StyleLiwen Hu; Siyang Liu; Guohua Xie; Wei Yang; Bin Zhang. 2019. "Bis(benzothiophene-S,S-dioxide) fused small molecules realize solution-processible, high-performance and non-doped blue organic light-emitting diodes." Journal of Materials Chemistry C 8, no. 3: 1002-1009.
The development of effectively universal interfacial materials for both conventional and inverted polymer solar cells (PSCs) plays a very crucial role in achieving highly photovoltaic performance and feasible device engineering. In this study, two novel alcohol-soluble conjugated polymers (PBSON-P and PBSON-FEO) with bis(benzothiophene-S,S-dioxide)-fused aromatics (FBTO) as the core unit and amino as functional groups are synthesized. They are utilized as universal cathode interfacial layers for both conventional and inverted PSCs simultaneously. Ascribing to the enlarged conjugated planarity and higher electron affinity for an FBTO unit, both PBSON-P and PBSON-FEO exhibit versatile electron-transporting abilities. They show wide band gaps that are important for light absorption in inverted PSCs, at which point PBSON-P and PBSON-FEO are more progressive than some of the reported small band gap cathode interfacial materials. Importantly, PBSON-P and PBSON-FEO display deep highest occupied molecular orbital energy levels, which can block holes at the cathode and thus increase the fill factor. As a result, both conventional and inverted PSCs using PBSON-P and PBSON-FEO as cathode interlayers realize high photovoltaic performance. Therefore, this series of novel polymers are amphibious cathode interfacial materials for high-performance conventional and inverted PSCs.
Guiting Chen; Gaoheng Qian; Shuwang Yi; Zhicai He; Hong-Bin Wu; Wei Yang; Bin Zhang; Yong Cao. Molecular Engineering on Bis(benzothiophene-S,S-dioxide)-Based Large-Band Gap Polymers for Interfacial Modifications in Polymer Solar Cells. ACS Applied Materials & Interfaces 2019, 11, 45969 -45978.
AMA StyleGuiting Chen, Gaoheng Qian, Shuwang Yi, Zhicai He, Hong-Bin Wu, Wei Yang, Bin Zhang, Yong Cao. Molecular Engineering on Bis(benzothiophene-S,S-dioxide)-Based Large-Band Gap Polymers for Interfacial Modifications in Polymer Solar Cells. ACS Applied Materials & Interfaces. 2019; 11 (49):45969-45978.
Chicago/Turabian StyleGuiting Chen; Gaoheng Qian; Shuwang Yi; Zhicai He; Hong-Bin Wu; Wei Yang; Bin Zhang; Yong Cao. 2019. "Molecular Engineering on Bis(benzothiophene-S,S-dioxide)-Based Large-Band Gap Polymers for Interfacial Modifications in Polymer Solar Cells." ACS Applied Materials & Interfaces 11, no. 49: 45969-45978.
High-performance conventional polymer solar cells based on a poly[N-9''-heptadecanyl-2,7-carbazole-alt- 5,5-(4',7'-di-2-thienyl-2',1',3'-benzothiadiazole)] (PCDTBT): [6,6]-phenyl C71-butyric acid methyl ester (PC $_71$ BM) system are achieved via cathodic interfacial engineering by a bispyridinium salt small molecule (FPyBr). The bispyridinium salt can form a directed dipole at the cathode interface and thus decrease the cathode work function, leading to an improved built-in potential and open-circuit voltage. The good energy level alignment and hole-blocking ability of FPyBr at the cathode may suppress the charge recombination and promote the electron extraction process to improve the device performance. A smooth and uniform FPyBr film can be formed on the active layer, resulting in a good interfacial contact. As a result, a power conversion efficiency of 7.68% can be realized with FPyBr, which is significantly higher than for bare Al, solvent-treated and poly[(9,9-bis(3'-(N,N-dimethylamino)-propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)]-modified devices. To the best of our knowledge, this result is one of the highest photovoltaic performance based on PCDTBT:PC $_71$ BM system. Therefore, FPyBr is a promising cathode modifier for high-performance polymer solar cells.
Guiting Chen; Sha Liu; Zhicai He; Hong-Bin Wu; Wei Yang; Bin Zhang. Efficient Interface Engineering Enhances Photovoltaic Performance of a Bulk-Heterojunction PCDTBT:PC71BM System. IEEE Journal of Photovoltaics 2019, 9, 1258 -1265.
AMA StyleGuiting Chen, Sha Liu, Zhicai He, Hong-Bin Wu, Wei Yang, Bin Zhang. Efficient Interface Engineering Enhances Photovoltaic Performance of a Bulk-Heterojunction PCDTBT:PC71BM System. IEEE Journal of Photovoltaics. 2019; 9 (5):1258-1265.
Chicago/Turabian StyleGuiting Chen; Sha Liu; Zhicai He; Hong-Bin Wu; Wei Yang; Bin Zhang. 2019. "Efficient Interface Engineering Enhances Photovoltaic Performance of a Bulk-Heterojunction PCDTBT:PC71BM System." IEEE Journal of Photovoltaics 9, no. 5: 1258-1265.
Blue organic light-emitting diodes (OLEDs) are of great significance in the fields of flat-panel display and solid-state lighting sources. Herein, two blue small molecules, consisting of spirobifluorene and dibenzothiophene-S,S-dioxide units (FSO-37SF and FSO-28SF) were successfully synthesized by the simple palladium-catalyzed Suzuki coupling reaction. The resulting molecules exhibited excellent thermal stability with thermal decomposition temperatures over 480 °C and high photoluminescence quantum efficiency up to 95.4% in solution. Ascribing to the introduction of unique spirobifuorene in dibenzothiophene-S,S-dioxide backbone, both of FSO-37SF and FSO-28SF showed the weak intermolecular interaction. Through the electroluminescent characterization, the donor-acceptor (D-A) typed FSO-37SF in the neat device exhibited a low roll-off and stable blue emission with Commission International de L’Eclairge (CIE) coordinates of (0.19, 0.14). Besides, the FSO-28SF in the neat device obtained a low turn-on voltage of 3.0 V in spite of broad emission. However, in the doping device with mCP as host, the FSO-28SF displayed higher luminance efficiency with CIE coordinates of (0.16, 0.06) and a narrow full-width at half maximum (FWHM) of 60 nm, which was very close to the CIE of the high-definition television (HDTV) standard blue.
Liwen Hu; Na Wang; Dongcheng Chen; Shi-Jian Su; Wei Yang; Bin Zhang. The dibenzothiophene-S,S-dioxide and spirobifluorene based small molecules promote Low roll-off and Blue organic light-emitting diodes. Journal of Photochemistry and Photobiology A: Chemistry 2019, 382, 111946 .
AMA StyleLiwen Hu, Na Wang, Dongcheng Chen, Shi-Jian Su, Wei Yang, Bin Zhang. The dibenzothiophene-S,S-dioxide and spirobifluorene based small molecules promote Low roll-off and Blue organic light-emitting diodes. Journal of Photochemistry and Photobiology A: Chemistry. 2019; 382 ():111946.
Chicago/Turabian StyleLiwen Hu; Na Wang; Dongcheng Chen; Shi-Jian Su; Wei Yang; Bin Zhang. 2019. "The dibenzothiophene-S,S-dioxide and spirobifluorene based small molecules promote Low roll-off and Blue organic light-emitting diodes." Journal of Photochemistry and Photobiology A: Chemistry 382, no. : 111946.
A series of symmetric carbazole derivatives (CzP-H, CzP-CN, CzP-Me, and CzP-OMe), which comprise electron-donating and electron-drawing groups appending on a phenyl core, was synthesized and characterized in detail. These compounds exhibit excellent thermal stabilities, with thermal decomposition temperatures exceeding 400 °C. From the fluorescent spectra in film, CzP-H, CzP-Me, and CzP-OMe showed UV to blue-violet emission, with peaks at 396 nm, 402 nm, and 392 nm, respectively. The E00 energies of CzP-H, CzP-CN, CzP-Me, and CzP-OMe were 3.39 eV, 2.83 eV, 3.50 eV, and 3.35 eV, respectively. From the electrochemical measurements, the highest occupied molecular orbital (HOMOs) energy levels were −5.30 eV, −5.64 eV, −5.46 eV, and −5.24 eV for CzP-H, CzP-CN, CzP-Me, and CzP-OMe, respectively. Through calculations from HOMO energy levels and E00 energies, the lowest unoccupied molecular orbital (LUMOs) energy levels of CzP-H, CzP-CN, CzP-Me, and CzP-OMe were −1.91 eV, −2.81 eV, −1.96 eV, and −1.89 eV, respectively. Therefore, the introduction of different substitutes in phenyl cores would distinctly affect the photophysical properties. These results indicate that the prepared carbazole derivatives could be potential candidates for realizing ultraviolet or blue-violet emission.
Siyang Liu; Pengju Lin; Fangfang Niu; Pengju Zeng; Bin Zhang. π-Bridge Effect on Symmetric Carbazole-Based Small Molecules for Realizing Ultraviolet Fluorescent Emission. Materials 2018, 11, 617 .
AMA StyleSiyang Liu, Pengju Lin, Fangfang Niu, Pengju Zeng, Bin Zhang. π-Bridge Effect on Symmetric Carbazole-Based Small Molecules for Realizing Ultraviolet Fluorescent Emission. Materials. 2018; 11 (4):617.
Chicago/Turabian StyleSiyang Liu; Pengju Lin; Fangfang Niu; Pengju Zeng; Bin Zhang. 2018. "π-Bridge Effect on Symmetric Carbazole-Based Small Molecules for Realizing Ultraviolet Fluorescent Emission." Materials 11, no. 4: 617.
Two large band-gap polymers (PTPACF and PTPA2CF) based on polytriphenylamine derivatives with the introduction of electron-withdrawing trifluoromethyl groups were designed and prepared by Suzuki polycondensation reaction. The chemical structures, thermal, optical and electrochemical properties were characterized in detail. From the UV-visible absorption spectra, the PTPACF and PTPA2CF showed the optical band gaps of 2.01 and 2.07 eV, respectively. The cyclic voltammetry (CV) measurement displayed the deep highest occupied molecular orbital (HOMO) energy levels of −5.33 and −5.38 eV for PTPACF and PTPA2CF, respectively. The hole mobilities, determined by field-effect transistor characterization, were 2.5 × 10−3 and 1.1 × 10−3 cm2 V−1 S−1 for PTPACF and PTPA2CF, respectively. The polymer solar cells (PSCs) were tested under the conventional device structure of ITO/PEDOT:PSS/polymer:PC71BM/PFN/Al. All of the PSCs showed the high open circuit voltages (Vocs) with the values approaching 1 V. The PTPACF and PTPA2CF based PSCs gave the power conversion efficiencies (PCEs) of 3.24% and 2.40%, respectively. Hence, it is a reliable methodology to develop high-performance large band-gap polymer donors with high Vocs through the feasible side-chain modification.
Shuwang Yi; Wanyuan Deng; Sheng Sun; Linfeng Lan; Zhicai He; Wei Yang; Bin Zhang. Trifluoromethyl-Substituted Large Band-Gap Polytriphenylamines for Polymer Solar Cells with High Open-Circuit Voltages. Polymers 2018, 10, 52 .
AMA StyleShuwang Yi, Wanyuan Deng, Sheng Sun, Linfeng Lan, Zhicai He, Wei Yang, Bin Zhang. Trifluoromethyl-Substituted Large Band-Gap Polytriphenylamines for Polymer Solar Cells with High Open-Circuit Voltages. Polymers. 2018; 10 (1):52.
Chicago/Turabian StyleShuwang Yi; Wanyuan Deng; Sheng Sun; Linfeng Lan; Zhicai He; Wei Yang; Bin Zhang. 2018. "Trifluoromethyl-Substituted Large Band-Gap Polytriphenylamines for Polymer Solar Cells with High Open-Circuit Voltages." Polymers 10, no. 1: 52.
A class of novel alcohol-soluble polyfluorene derivatives with a pyridine group incorporating at the side chains of fluorene is developed to modify the cathode interfaces of both conventional and inverted polymer solar cells. A class of novel alcohol-soluble conjugated polymers with pyridine incorporated at the side chains of fluorene scaffolds is developed and used as cathode interfacial layers (CILs) for both conventional and inverted polymer solar cells (PSCs). The pyridine group can endow these polymers with solubility in methanol (MeOH) in the presence of trace acetic acid (AcOH), which is beneficial for the realization of PSC fabrication by low-cost solution processing without interfacial mixing. In addition, the pyridine group can not only build interfacial dipoles at the CIL/cathode interfaces, leading to reduced cathode work functions and improved open-circuit voltages, but also n-dope the fullerene acceptors, which decreases the interfacial energy loss at the cathode side. As a result, for conventional PSCs based on poly[ N -9′′-heptadecanyl-2,7-carbazole- alt -5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)] (PCDTBT):[6,6]-phenyl C71-butyric acid methyl ester (PC71BM), these resulting polymers can increase the power conversion efficiency (PCE) from 5.38% (without any CIL) and 5.50% (with MeOH/AcOH treatment) to 6.54%–6.97%. For the inverted PSCs based on poly[4,8-bis(2-ethylhexyloxyl)benzo[1,2- b :4,5- b ′]dithiophene-2,6-diyl- alt -ethylhexyl-3-fluorothieno[3,4- b ]thiophene-2-carboxylate-4,6-diyl] (PTB7):PC71BM, these resulting polymers can improve the PCE from 3.64% (without any CIL) and 4.25% (with MeOH/AcOH treatment) to 7.21%–7.96%. Therefore, these pyridine-functionalized polymers are promising candidates as CILs for high-performance PSCs.
Guiting Chen; Sha Liu; Zhicai He; Hong-Bin Wu; Wei Yang; Bin Zhang; Yong Cao. Pyridine-incorporated alcohol-soluble neutral polyfluorene derivatives as efficient cathode-modifying layers for polymer solar cells. Polymer Chemistry 2017, 8, 6720 -6732.
AMA StyleGuiting Chen, Sha Liu, Zhicai He, Hong-Bin Wu, Wei Yang, Bin Zhang, Yong Cao. Pyridine-incorporated alcohol-soluble neutral polyfluorene derivatives as efficient cathode-modifying layers for polymer solar cells. Polymer Chemistry. 2017; 8 (44):6720-6732.
Chicago/Turabian StyleGuiting Chen; Sha Liu; Zhicai He; Hong-Bin Wu; Wei Yang; Bin Zhang; Yong Cao. 2017. "Pyridine-incorporated alcohol-soluble neutral polyfluorene derivatives as efficient cathode-modifying layers for polymer solar cells." Polymer Chemistry 8, no. 44: 6720-6732.
Guiting Chen; Sheng Sun; Yong Yang; Linfeng Lan; Lei Ying; Wei Yang; Bin Zhang; Yong Cao. A solution-processed and low threshold voltage p-type small molecule based on indolocarbazole- and benzothiophene-fused rings. Dyes and Pigments 2017, 144, 32 -40.
AMA StyleGuiting Chen, Sheng Sun, Yong Yang, Linfeng Lan, Lei Ying, Wei Yang, Bin Zhang, Yong Cao. A solution-processed and low threshold voltage p-type small molecule based on indolocarbazole- and benzothiophene-fused rings. Dyes and Pigments. 2017; 144 ():32-40.
Chicago/Turabian StyleGuiting Chen; Sheng Sun; Yong Yang; Linfeng Lan; Lei Ying; Wei Yang; Bin Zhang; Yong Cao. 2017. "A solution-processed and low threshold voltage p-type small molecule based on indolocarbazole- and benzothiophene-fused rings." Dyes and Pigments 144, no. : 32-40.
Water-soluble polypyrrole nanoparticles (PPy NPs) were developed and demonstrated as effective modifiers of PEDOT:PSS. By using them as the anode interfaces of polymer solar cells (PSCs), these PSCs showed a high power conversion efficiency (PCE) with the value of 9.48% as doping 20% PPy NPs into PEDOT:PSS. Interestingly, the enhancement of ∼16% and ∼150% compared with that of pure PEDOT:PSS (PCE = 8.04%) and PEDOT:PSS-free (PCE = 3.76%) was observed. Importantly, the stability of these devices with 20% PPy NPs doped PEDOT:PSS was also improved significantly. The enhanced performance was possible attributed to the changes of pH value, enhanced conductivities, and morphological changes of PEDOT:PSS. Our study supplies an alternative method to obtain high-efficient PSCs with the development of polymer NPs interfacial materials.
Xingye Zhang; Bin Zhang; Xinhua Ouyang; Lihui Chen; Hui Wu. Polymer Solar Cells Employing Water-Soluble Polypyrrole Nanoparticles as Dopants of PEDOT:PSS with Enhanced Efficiency and Stability. The Journal of Physical Chemistry C 2017, 121, 18378 -18384.
AMA StyleXingye Zhang, Bin Zhang, Xinhua Ouyang, Lihui Chen, Hui Wu. Polymer Solar Cells Employing Water-Soluble Polypyrrole Nanoparticles as Dopants of PEDOT:PSS with Enhanced Efficiency and Stability. The Journal of Physical Chemistry C. 2017; 121 (34):18378-18384.
Chicago/Turabian StyleXingye Zhang; Bin Zhang; Xinhua Ouyang; Lihui Chen; Hui Wu. 2017. "Polymer Solar Cells Employing Water-Soluble Polypyrrole Nanoparticles as Dopants of PEDOT:PSS with Enhanced Efficiency and Stability." The Journal of Physical Chemistry C 121, no. 34: 18378-18384.
A novel bispyridinium salt (FPyBr) is designed as a cathode modifier to achieve high-performance and low-hysteresis fullerene/perovskite solar cells with a maximal PCE of 19.61%.
Guiting Chen; Fan Zhang; Meiyue Liu; Jun Song; Jiarong Lian; Pengju Zeng; Hin-Lap Yip; Wei Yang; Bin Zhang; Yong Cao. Fabrication of high-performance and low-hysteresis lead halide perovskite solar cells by utilizing a versatile alcohol-soluble bispyridinium salt as an efficient cathode modifier. Journal of Materials Chemistry A 2017, 5, 17943 -17953.
AMA StyleGuiting Chen, Fan Zhang, Meiyue Liu, Jun Song, Jiarong Lian, Pengju Zeng, Hin-Lap Yip, Wei Yang, Bin Zhang, Yong Cao. Fabrication of high-performance and low-hysteresis lead halide perovskite solar cells by utilizing a versatile alcohol-soluble bispyridinium salt as an efficient cathode modifier. Journal of Materials Chemistry A. 2017; 5 (34):17943-17953.
Chicago/Turabian StyleGuiting Chen; Fan Zhang; Meiyue Liu; Jun Song; Jiarong Lian; Pengju Zeng; Hin-Lap Yip; Wei Yang; Bin Zhang; Yong Cao. 2017. "Fabrication of high-performance and low-hysteresis lead halide perovskite solar cells by utilizing a versatile alcohol-soluble bispyridinium salt as an efficient cathode modifier." Journal of Materials Chemistry A 5, no. 34: 17943-17953.
A novel n-type conjugated polymer containing dibenzothiophene-S,S-dioxide (FSO), bispyridinium, and fluorene scaffolds in the backbone (PFSOPyCl) was synthesized and used in the cathode interfacial layers (CILs) of conventional polymer solar cells (PSCs). The high electron affinities and large planar structures of the FSO and bispyridinium units endowed this polymer with good energy level alignments with [6,6]-phenyl-C71 butyric acid methyl ester (PC71BM) and metal cathode, and excellent electron transport and extraction properties. Polymer solar cells (PSCs) based on the poly[N-9″-heptadecanyl-2,7-carbazole-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)] (PCDTBT):PC71BM system with PFSOPyCl CIL exhibited simultaneous enhancement in open-circuit voltage (Voc), short-circuit current density (Jsc), and fill factor (FF), while the power conversion efficiency increased from 5.47% to 6.79%, relative to the bare Al device. Besides, PSC based on the poly[4,8-bis(2-ethylhexyloxyl)benzo[1,2-b:4,5-b′]dithio-phene-2,6-diyl-alt-ethylhexyl-3-fluorothithieno [3,4-b]thiophene-2-carboxylate-4,6-diyl] (PTB7):PC71BM system achieved a PCE of 8.43% when using PFSOPyCl as CIL. Hence, PFSOPyCl is a promising candidate CIL for PSCs.
Guiting Chen; Sha Liu; Jin Xu; Ruifeng He; Zhicai He; Hong-Bin Wu; Wei Yang; Bin Zhang; Yong Cao. Dibenzothiophene-S,S-dioxide and Bispyridinium-Based Cationic Polyfluorene Derivative as an Efficient Cathode Modifier for Polymer Solar Cells. ACS Applied Materials & Interfaces 2017, 9, 4778 -4787.
AMA StyleGuiting Chen, Sha Liu, Jin Xu, Ruifeng He, Zhicai He, Hong-Bin Wu, Wei Yang, Bin Zhang, Yong Cao. Dibenzothiophene-S,S-dioxide and Bispyridinium-Based Cationic Polyfluorene Derivative as an Efficient Cathode Modifier for Polymer Solar Cells. ACS Applied Materials & Interfaces. 2017; 9 (5):4778-4787.
Chicago/Turabian StyleGuiting Chen; Sha Liu; Jin Xu; Ruifeng He; Zhicai He; Hong-Bin Wu; Wei Yang; Bin Zhang; Yong Cao. 2017. "Dibenzothiophene-S,S-dioxide and Bispyridinium-Based Cationic Polyfluorene Derivative as an Efficient Cathode Modifier for Polymer Solar Cells." ACS Applied Materials & Interfaces 9, no. 5: 4778-4787.
Two water-soluble cationic fluorophores (FSOPyCl and FSOmiCl) based on bispyridinium and dibenzothiophene-S,S-dioxide show deep blue emission, and exhibit high photoluminescence quantum yields of 69% and 50% in water, respectively.
Guiting Chen; Ruifeng He; Wei Yang; Bin Zhang. Synthesis and optical and electrochemical properties of water-soluble cationic fluorophores based on bispyridinium and dibenzothiophene-S,S-dioxide. New Journal of Chemistry 2017, 41, 1696 -1703.
AMA StyleGuiting Chen, Ruifeng He, Wei Yang, Bin Zhang. Synthesis and optical and electrochemical properties of water-soluble cationic fluorophores based on bispyridinium and dibenzothiophene-S,S-dioxide. New Journal of Chemistry. 2017; 41 (4):1696-1703.
Chicago/Turabian StyleGuiting Chen; Ruifeng He; Wei Yang; Bin Zhang. 2017. "Synthesis and optical and electrochemical properties of water-soluble cationic fluorophores based on bispyridinium and dibenzothiophene-S,S-dioxide." New Journal of Chemistry 41, no. 4: 1696-1703.
Wenkai Zhong; Chao Xu; Biao Xiao; Li Fan; HongBin Wu; Bin Zhang; Wei Yang. High molecular weight broad band-gap polymers based on indolo[3,2-b]carbazole and thiazolo[5,4-d]thiazole derivatives for solar cells. Polymer Science, Series B 2016, 58, 587 -593.
AMA StyleWenkai Zhong, Chao Xu, Biao Xiao, Li Fan, HongBin Wu, Bin Zhang, Wei Yang. High molecular weight broad band-gap polymers based on indolo[3,2-b]carbazole and thiazolo[5,4-d]thiazole derivatives for solar cells. Polymer Science, Series B. 2016; 58 (5):587-593.
Chicago/Turabian StyleWenkai Zhong; Chao Xu; Biao Xiao; Li Fan; HongBin Wu; Bin Zhang; Wei Yang. 2016. "High molecular weight broad band-gap polymers based on indolo[3,2-b]carbazole and thiazolo[5,4-d]thiazole derivatives for solar cells." Polymer Science, Series B 58, no. 5: 587-593.
Two chemically tailored new conjugated copolymers, HSL1 and HSL2, were developed and applied as hole selective layers to improve the anode interface of fullerene/perovskite planar heterojunction solar cells. The introduction of polar functional groups on the polymer side chains increases the surface energy of the hole selective layers (HSLs), which promote better wetting with the perovskite films and lead to better films with full coverage and high crystallinity. The deep highest occupied molecular orbital levels of the HSLs align well with the valence band of the perovskite semiconductors, resulted in increase photovoltage. The high lying lowest unoccupied molecule orbital level provides sufficient electron blocking ability to prevent electrons from reaching the anode and reduces the interfacial trap‐assisted recombination at the poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate)/perovskite interface, resulting in a longer charge‐recombination lifetime and shorter charge‐extraction time. In the presence of the HSLs, high‐performance CH3NH3PbI xCl3− x perovskite solar cells with a power conversion efficiency (PCE) of 16.6% (V oc: 1.07 V) and CH3NH3Pb(I0.3Br0.7) xCl3− x cells with a PCE of 10.3% (V oc: 1.34 V) can be realized.
Qifan Xue; Guiting Chen; Meiyue Liu; Jingyang Xiao; Ziming Chen; Zhicheng Hu; Xiao-Fang Jiang; Bin Zhang; Fei Huang; Wei Yang; Hin-Lap Yip; Yong Cao. Improving Film Formation and Photovoltage of Highly Efficient Inverted-Type Perovskite Solar Cells through the Incorporation of New Polymeric Hole Selective Layers. Advanced Energy Materials 2015, 6, 1 .
AMA StyleQifan Xue, Guiting Chen, Meiyue Liu, Jingyang Xiao, Ziming Chen, Zhicheng Hu, Xiao-Fang Jiang, Bin Zhang, Fei Huang, Wei Yang, Hin-Lap Yip, Yong Cao. Improving Film Formation and Photovoltage of Highly Efficient Inverted-Type Perovskite Solar Cells through the Incorporation of New Polymeric Hole Selective Layers. Advanced Energy Materials. 2015; 6 (5):1.
Chicago/Turabian StyleQifan Xue; Guiting Chen; Meiyue Liu; Jingyang Xiao; Ziming Chen; Zhicheng Hu; Xiao-Fang Jiang; Bin Zhang; Fei Huang; Wei Yang; Hin-Lap Yip; Yong Cao. 2015. "Improving Film Formation and Photovoltage of Highly Efficient Inverted-Type Perovskite Solar Cells through the Incorporation of New Polymeric Hole Selective Layers." Advanced Energy Materials 6, no. 5: 1.