Alkyl chain engineering of non-fullerene small molecule acceptors for solution-processable organic solar cells

作者:Yi, LZ (Yi, Lezhi)[ 1 ] ; Dai, SY (Dai, Suiyang)[ 1 ] ; Sun, R (Sun, Rui)[ 1 ] ; Wang, W (Wang, Wei)[ 1 ] ; Wu, Y (Wu, Yao)[ 1 ] ; Jiao, XC (Jiao, Xuechen)[ 2 ] ; Zhang, C (Zhang, Chang)[ 1 ] ; Min, J (Min, Jie)[ 1,3,4 ]

ORGANIC ELECTRONICS

卷: 87

文献号: 105963

DOI: 10.1016/j.orgel.2020.105963

出版年:DEC 2020

文献类型:Article

摘要

The impact of alkyl side chain substitutions of small molecule non-fullerene acceptors (NFAs) on their photovoltaic performance of bulk heterojunction (BHJ) organic solar cells (OSCs) has been studied. To further investigate the effects of side chains, in this work a series of NFAs based on a Y6 core derivatized with various alkyl groups of 6-phenylhexyl, 6-phenoxylhexyl and n-octyl (named Y6-phC6, Y6-phOC6, and Y6-nC8) are synthesized, and their detailed structure-properties correlations are investigated. The results in terms of UV-vis absorption, cyclic voltammetry and density functional theory calculation show the variations of alkyl chains have little influence on the absorption spectra and energy levels. However, these seemingly negligible changes have a pronounced impact on the molecular aggregation or crystallinity in the neat films, which in turn influences the photovoltaic properties of these devices resulting from the various microstructures of the BHJ blends and carrier dynamics in the corresponding devices. Among these three systems, OSCs based on a blend of Y6-phC6 and polymer donor PM6 show the highest power conversion efficiency of 11.77%.

关键词

KeyWords Plus:13-PERCENT EFFICIENCY; ELECTRON-ACCEPTORS; POLYMER; PERFORMANCE; RECOMBINATION; UNIT

作者信息

通讯作者地址:

Wuhan University Wuhan Univ, Inst Adv Studies, Wuhan 430072, Peoples R China.

通讯作者地址: Min, J (通讯作者)

Wuhan Univ, Inst Adv Studies, Wuhan 430072, Peoples R China.

地址:

[ 1 ]‎ Wuhan Univ, Inst Adv Studies, Wuhan 430072, Peoples R China

[ 2 ]‎ Monash Univ, Dept Mat Sci & Engn, Melbourne, Vic, Australia

[ 3 ]‎ Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China

[ 4 ]‎ Zhengzhou Univ, Minist Educ, Key Lab Mat Proc & Mold, Zhengzhou 450002, Peoples R China

电子邮件地址:min.jie@whu.edu.cn