- Dithienosilole–phenylquinoxaline-based copolymers with A-D-A-D and A-D structures for polymer solar cells
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Two copolymers having D-A-D-A (P1) and D-A (P2) structures with quinoxaline acceptor unit and dithienosilole donor unit were synthesized and their optical and electrochemical (both experimental and theoretical) properties were investigated. The optical pr
- Keshtov, Mukhamed L.,Khokhlov, Alexei R.,Kuklin, Sergei A.,Nikolaev, Alexander Yu,Koukaras, Emmanuel N.,Sharma, Ganesh D.
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p. 376 - 386
(2017/11/23)
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- FUSED RING DERIVATIVE AND ORGANIC SOLAR CELL COMPRISING THE SAME
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The present invention relates to a condensed cyclic derivative represented by chemical formula 1, and an organic solar cell containing the same. According to an embodiment of the present invention, the condensed cyclic derivative exhibits excellent coating properties by having a hydroxyl group, an alkyl group, an alkoxy group, and a sulfide group as a substituent.COPYRIGHT KIPO 2017
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- Synthesis and photophysical properties of semiconductor molecules D1-A-D2-A-D1-type structure based on derivatives of quinoxaline and dithienosilole for organics solar cells
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A novel small molecule with D1-A-D2-A-D1 structure denoted as DTS(QxHT2)2 based on quinoxaline acceptor and dithienosilone donor units was synthesized and its optical and electrochemical properties were investigated. The thin film of DTS(QxHT2)2 showed a broad absorption profile covering the solar spectrum from 350?nm to 780?nm with an optical bandgap of 1.63?eV. The energy levels estimated from the cyclic voltammetry indicate that this small molecule is suitable as donor along with PC71BM as acceptor for the fabrication solution processed bulk heterojunction solar cells for efficient exciton dissociation and high open circuit voltage. The organic solar cells based on optimized DTS(QxHT2)2:PC71BM active layers processed with chloroform and DIO/CF showed overall power conversion efficiency of 3.16% and 6.30%, respectively. The higher power conversion efficiency of the solar cell based on the DIO/CF processed active layer is attributed to enhanced short circuit photocurrent and fill factor may be related to better phase separation between donor and acceptor in the active layer and more balanced charge transport, induced by the solvent additive. The power conversion efficiency of the organic solar cell was further improved up to 7.81% based on active layer processed with solvent additive, using CuSCN as hole transport layer instead of PEDOT:PSS and mainly attributed to increased fill factor and open circuit voltage due the formation of better Ohmic contact between the active layer and the CuSCN layer.
- Keshtov,Godovsky, D. Yu,Kuklin,Nicolaev,Lee,Lim,Lee,Koukaras,Sharma, Ganesh D.
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p. 361 - 370
(2016/11/09)
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- Comparative studies of photochemical cross-linking methods for stabilizing the bulk hetero-junction morphology in polymer solar cells
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We are here presenting a comparative study between four different types of functionalities for cross-linking. With relatively simple means bromine, azide, vinyl and oxetane could be incorporated into the side chains of the low band-gap polymer TQ1. Cross-linking of the polymers was achieved by UV-light illumination to give solvent resistant films and reduced phase separation and growth of PCBM crystallites in polymer:PCBM films. The stability of solar cells based on the cross-linked polymers was tested under various conditions. This study showed that cross-linking can improve morphological stability but that it has little influence on the photochemical stability which is also decisive for stable device operation under constant illumination conditions. The Royal Society of Chemistry 2012.
- Carle, Jon Eggert,Andreasen, Birgitta,Tromholt, Thomas,Madsen, Morten V.,Norrman, Kion,Jorgensen, Mikkel,Krebs, Frederik C.
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p. 24417 - 24423
(2013/03/28)
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- A copolymer based on benzo[1,2-b:4,5-b′]dithiophene and quinoxaline derivative for photovoltaic application
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A D-A-D copolymer (PBDTQx) with a bandgap of 1.78 eV, containing alkoxy-substituted benzo[1,2-b:4,5-b′]dithiophene (BDT) as donor and quinoxaline derivative (Qx) as acceptor, was synthesized by Stille coupling reaction. In order to study the photovoltaic property of PBDTQx, polymer solar cells (PSCs) were fabricated with PBDTQx as the electron donor blended with [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) as the electron acceptor. The power conversion efficiency (PCE) of PSC was 1.01% for an optimized PBDTQx: PC61BM ratio of 1:5, under the illumination of AM 1.5, 100 mW/cm2. The results indicated that PBDTQx was a promising donor candidate in the application of polymer solar cells.
- Wu, Haimei,Qu, Bo,Cong, Zhiyuan,Liu, Hongli,Tian, Di,Gao, Bowen,An, Zhongwei,Gao, Chao,Xiao, Lixin,Chen, Zhijian,Liu, Huanhuan,Gong, Qihuang,Wei, Wei
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p. 897 - 903
(2012/10/30)
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