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Crystallinity dictates the selection of fullerene or non-fullerene acceptors in a small molecule organic solar cell
Yu, Qingqing1,2; Xu, Jingjing1,3; Fu, Jiehao1,3; Xu, Tongle1,2; Yan, Xinhao1,2; Chen, Shanshan4; Chen, Haiyan1,3; Sun, Kuan4; Kan, Zhipeng1,3; Lu, Shirong1,3
2021-03-01
摘要The side chains of a molecule affect the molecular packing and crystallinity which are crucial factors determining the photovoltaic properties in organic solar cells (OSCs). In this work, two small molecule donors, BDT(X1) and BDT(X2), with identical backbone and slightly different side chains on the end groups have been designed and synthesized. Compared with BDT(X1) with linear alkyl chain, BDT(X2) featuring a branched alkyl chain in the terminal groups has larger steric hindrance and exhibits weaker crystallinity and less compact molecule stacking. Application of the two small molecule donors in OSCs shows that BDT(X1) is more suitable for IDIC, a nonfullerene acceptor, while BDT(X2) demonstrates higher OSC performance when blended with fullerene acceptor PC71 BM. Morphology and grazing-incidence wide-angle X-ray scattering (GIWAXS) studies reveal that crystallinity plays a key role in determining the molecular packing and phase separation with fullerene/non-fullerene acceptors which in turn influence the charge transport and photovoltaic properties. Our results provide some guidance on selection of acceptors for a given donor and demonstrate the importance of fine tuning of the crystallinity in small molecule OSCs.
关键词Organic solar cells Crystallinity Small molecule donor Photovoltaic performances Device fabrication
DOI10.1016/j.dyepig.2020.109085
发表期刊DYES AND PIGMENTS
ISSN0143-7208
卷号187页码:6
通讯作者Xu, Tongle(xutongle@cigit.ac.cn) ; Lu, Shirong(lushirong@cigit.ac.cn) ; Xiao, Zeyun(xiao.z@cigit.ac.cn)
收录类别SCI
WOS记录号WOS:000618737900010
语种英语