Comparison of conventional and inverted structures in fullerene-free organic solar cells  

作　　者：Yifan Wang Huitao Bai Xiaowei Zhan 

机构地区：[1]Beijing National Laboratory for Molecular Sciences,Institute of Chemistry,Chinese Academy of Sciences [2]University of Chinese Academy of Sciences [3]Department of Materials Science and Engineering,College of Engineering,Key Laboratory of Polymer Chemistry and Physics of Ministry of Education,Peking University

出　　处：《Journal of Energy Chemistry》2015年第6期744-749,共6页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(91433114,51261130582,21025418);the 973 Program(2011CB808401);the Chinese Academy of Sciences

摘　　要：A n-type small molecule DC-IDT2E with 4,4,9,9-tetrakis（4-hexylphenyl）-indaceno[1,2-b：5,6-bt]dithiophene as a central building block, furan as rr-bridges, and 1,1 -dicyanomethylene-3-indanone as end acceptor groups, was synthesized and used as an electron acceptor in solution-processed organic solar cells （OSCs）. DC-IDT2F exhibited good thermal stability, broad and strong absorption in 500-850 rim, a narrow bandgap of 1.54 eV, LUMO of-3.88 eV, HOMO of-5.44 eV and an electron mobility of 6.5 × 10-4 cm2/（V.s）. DC-IDT2F-based OSCs with conventional and inverted structures exhibited power conversion efficiencies of 2.26 and 3.08% respec- tively. The effect of vertical phase separation and morphology of the active layer on the device performance in the two structures was studied.A n-type small molecule DC-IDT2E with 4,4,9,9-tetrakis（4-hexylphenyl）-indaceno[1,2-b：5,6-bt]dithiophene as a central building block, furan as rr-bridges, and 1,1 -dicyanomethylene-3-indanone as end acceptor groups, was synthesized and used as an electron acceptor in solution-processed organic solar cells （OSCs）. DC-IDT2F exhibited good thermal stability, broad and strong absorption in 500-850 rim, a narrow bandgap of 1.54 eV, LUMO of-3.88 eV, HOMO of-5.44 eV and an electron mobility of 6.5 × 10-4 cm2/（V.s）. DC-IDT2F-based OSCs with conventional and inverted structures exhibited power conversion efficiencies of 2.26 and 3.08% respec- tively. The effect of vertical phase separation and morphology of the active layer on the device performance in the two structures was studied.

关 键 词：Organic solar cells Non-fullerene acceptors Fullerene free Vertical phase separation Inverted structure 

分 类 号：O613.71[理学—无机化学] TM914.4[理学—化学]