Photovoltaic molecules based on vinylene-bridged oligothiophene applied for bulk-heterojunction organic solar cells  

作　　者：Jing Zhang Pan Yin Linjun Xu Ping Shen Mingfu Ye Ningyi Yuan Jianning Ding 

机构地区：[1]School of Material Science & Engineering, Jiangsu Collaborative Innovation Center of Photovoltaic Science & Engineering, Changzhou University, Changzhou 213164, Jiangsu, China [2]College of Chemistry and Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, Xiongtan University, Xiangtan 411105, Hunan, China [3]School of Chemistry and Chemical Engineering Anhui University of Technology, Maanshan 243002, Anhui, China

出　　处：《Journal of Energy Chemistry》2018年第2期426-431,共6页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China (51272033, 51572037, 51603021);333 Project of Jiangsu Province (BRA2017353);the Priority Academic Program Development of Jiangsu Higher Education Institutions and Anhui Provincial Natural Science Foundation (1608085QF156)

摘　　要：We have synthesized two photovoltaic molecules（HEX-3TVT-ID and EH-3TVT-ID） based on vinylenebridged oligothiophene applied as donor for the solution-processable bulk-heterojunction organic solar cells（OSCs）. Vinylene unit was introduced as π-bridge in the oligothiophenes with 1,3-indenedione as end group and 4,4’-dihexyl-2,2’：5’,2’-terthiophene or 3’,4’-di（octan-3-yl）-2,2’：5’,2’-terthiophene as core,respectively. Due to the different substituent positions of the alkyl group relative to the vinylene unit in the terthiophene, HEX-3TVT-ID and EH-3TVT-ID show different optical and electrochemical properties, corresponding to the photovoltaic performance of the OSCs devices. The power conversion efficiency（PCE） of the OSCs based on a blend of HEX-3TVT-ID and PC71BM（1：0.8, weight ratio, 0.5% CN） reached 2.3%. In comparison, the OSCs based on the blend of EH-3TVT-ID and PC71BM in the weight ratio of 1：1 without the additive show a higher PCE of 2.7%, with a typically high VOC of 0.93 V, under the illumination of AM 1.5, 100 mW cm-2.We have synthesized two photovoltaic molecules（HEX-3TVT-ID and EH-3TVT-ID） based on vinylenebridged oligothiophene applied as donor for the solution-processable bulk-heterojunction organic solar cells（OSCs）. Vinylene unit was introduced as π-bridge in the oligothiophenes with 1,3-indenedione as end group and 4,4’-dihexyl-2,2’：5’,2’-terthiophene or 3’,4’-di（octan-3-yl）-2,2’：5’,2’-terthiophene as core,respectively. Due to the different substituent positions of the alkyl group relative to the vinylene unit in the terthiophene, HEX-3TVT-ID and EH-3TVT-ID show different optical and electrochemical properties, corresponding to the photovoltaic performance of the OSCs devices. The power conversion efficiency（PCE） of the OSCs based on a blend of HEX-3TVT-ID and PC71BM（1：0.8, weight ratio, 0.5% CN） reached 2.3%. In comparison, the OSCs based on the blend of EH-3TVT-ID and PC71BM in the weight ratio of 1：1 without the additive show a higher PCE of 2.7%, with a typically high VOC of 0.93 V, under the illumination of AM 1.5, 100 mW cm-2.

关 键 词：Organic solar cells Photovoltaic organic molecules Vinylene-bridged oligothiophene 

分 类 号：TM914.4[电气工程—电力电子与电力传动]