Rhodanine flanked indacenodithiophene as non-fullerene acceptor for efficient polymer solar cells  

作　　者：Boyu Jia Yao Wu Fuwen Zhao Cenqi Yan Siya Zhu Pei Cheng Jiangquan Mai Tsz-Ki Lau Xinhui Lu Chun-Jen Su Chunru Wang Xiaowei Zhan 

机构地区：[1]Key Laboratory of Polymer Chemistry and Physics of Ministry of Education,Department of Materials Science and Engineering,College of Engineering,Peking University,Beijing 100871,China [2]Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China [3]Department of Physics,Chinese University of Hong Kong,New Territories,Hong Kong,China [4]National Synchrotron Radiation Research Center,Taiwan 30076,China

出　　处：《Science China Chemistry》2017年第2期257-263,共7页中国科学（化学英文版）

基　　金：supported by the National Basic Research Program of China(2013CB834702);the National Natural Science Foundation of China(91433114)

摘　　要：A fused-ring electron acceptor IDT-2BR1 based on indacenodithiophene core with hexyl side-chains flanked by benzothiadiazole rhodanine was designed and synthesized.In comparison with its counterpart with hexylphenyl side-chains(IDT-2BR),IDT-2BR1exhibits higher highest occupied molecular orbital(HOMO)energy but similar lowest unoccupied molecular orbital(LUMO)energy(IDT-2BR1:HOMO=-5.37eV,LUMO=-3.67eV;IDT-2BR:HOMO=-5.52eV,LUMO=-3.69eV),red-shifted absorption and narrower bandgap.IDT-2BR1 has higher electron mobility(2.2×10^(-3)cm^2 V^(-1)s^(-1))than IDT-2BR(3.4×10^(-4)cm^2 V^(-1)s^(-1))due to the reduced steric hindrance and ordered molecular packing.Fullerene-free organic solar cells based on PTB7-Th:IDT-2BRl yield power conversion efficiencies up to 8.7%,higher than that of PTB7-Th:IDT-2BR(7.7%),with a high open circuit voltage of0.95 V and good device stability.A fused-ring electron acceptor IDT-2BR1 based on indacenodithiophene core with hexyl side-chains flanked by benzothiadiazole rhodanine was designed and synthesized.In comparison with its counterpart with hexylphenyl side-chains（IDT-2BR）,IDT-2BR1exhibits higher highest occupied molecular orbital（HOMO）energy but similar lowest unoccupied molecular orbital（LUMO）energy（IDT-2BR1：HOMO=-5.37eV,LUMO=-3.67eV;IDT-2BR：HOMO=-5.52eV,LUMO=-3.69eV）,red-shifted absorption and narrower bandgap.IDT-2BR1 has higher electron mobility（2.2×10^-3 cm^2 V^-1 s^-1 ）than IDT-2BR（3.4×10^-4 cm^2 V^-1 s^-1 ）due to the reduced steric hindrance and ordered molecular packing.Fullerene-free organic solar cells based on PTB7-Th：IDT-2BRl yield power conversion efficiencies up to 8.7%,higher than that of PTB7-Th：IDT-2BR（7.7%）,with a high open circuit voltage of0.95 V and good device stability.

关 键 词：organic solar cell non-fullerene acceptor fused-ring electron acceptor indacenodithiophene rhodanine 

分 类 号：TM914.4[电气工程—电力电子与电力传动] O626[理学—有机化学]