Synthesis and photovoltaic properties of a star-shaped molecule based on a triphenylamine core and branched terthiophene end groups  

作　　者：GAO Lei ZHANG Jing HE Chang SHEN SuLing ZHANG Yi LIU HongTao SUN QingJiang LI YongFang 

机构地区：[1]State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University [2]Institute of Chemistry, Chinese Academy of Sciences

出　　处：《Science China Chemistry》2013年第7期997-1003,共7页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China (50933003 and 21021091);the support from MOE, Jiangsu Province, and SEU (NCET-09-0294, 20100092120037,XNY-48-037 and Seujq201103)

摘　　要：A new star-shaped donor-acceptor molecule has been synthesized for application as the donor material in solution-processed bulk-heterojunction organic solar cells (OSCs). The molecule consists of a triphenylamine (TPA) unit as the core and a donor unit with three arms containing benzo[1,2,5]thiadiazole (BT) acceptor units and 5,5''-dihexyl-2,2′:3′,2″-terthiophene (tTh) end groups. The molecule, denoted S(TPA-BT-tTh), exhibits a broad absorption band in the wavelength range 300-650 nm and high hole mobility of 1.1×10 -4 cm2 V -1 s 1 . An OSC device based on S(TPA-BT-tTh) as donor and [6,6]-phenyl C71 -butyric acid methyl ester (PC 70 BM) as the acceptor (1:3, w/w) exhibited a power conversion efficiency of 2.28% with a short circuit current density of 6.39 mA/cm2 under illumination of AM.1.5, 100 mW/cm2 .A new star-shaped donor-acceptor molecule has been synthesized for application as the donor material in solution-processed bulk-heterojunction organic solar cells （OSCs）. The molecule consists of a triphenylamine （TPA） unit as the core and a donor unit with three arms containing benzo[1,2,5]thiadiazole （BT） acceptor units and 5,5＇-dihexyl-2,2＇：3＇,2＇-terthiophene （tTh） end groups. The molecule, denoted S（TPA-BT-tTh）, exhibits a broad absorption band in the wavelength range 300-650 nm and high hole mobility of 1.1×10^-4 cm2 V^-1 s^-1. An OSC device based on S（TPA-BT-tTh） as donor and [6,6]-phenyl C71-butyric acid methyl ester （PC70BM） as the acceptor （1：3, w/w） exhibited a power conversion efficiency of 2.28% with a short circuit current density of 6.39 mA/cm2 under illumination of AM. 1.5, 100 mW/cm2.

关 键 词：organic solar cells star-shaped photovoltaic organic molecules solution-processability 

分 类 号：O626.12[理学—有机化学] TQ426.92[理学—化学]