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Simple organic donors based on halogenated oligothiophenes for all small molecule solar cells with efficiency over 11%
Duan, Tainan1,6; Gao, Jie1; Xu, Tongle1; Kan, Zhipeng1; Chen, Wenjing2; Singh, Ranbir3; Kini, Gururaj P.4; Zhong, Cheng5; Yu, Donghong6; Xiao, Zhengguo2
2020-03-28
摘要Recent work has emphasized the pivotal role of halogen substituents in the development of polymer donors or small-molecule (SM) acceptors for efficient bulk-heterojunction (BHJ) solar cells. However, the application of -F or -Cl substitutions in the design of SM donors is yet to receive similar considerations. In this contribution, we report a set of oligothiophene derivatives (2F7T and 2Cl7T) with halogenation at the central thienyl moiety. Such halogenation is shown to induce a sufficient increase in ionization potential (IP; i.e. deeper HOMO) to modify the electron-donating and -transporting characteristics of the molecules. When combined with a low-bandgap SM acceptor (Y6), the devices with 2Cl7T achieved power conversion efficiencies (PCEs) of up to ca. 11.5% (vs. ca. 2.5% for non-halogenated donor DRCN7T based devices), representing the best photovoltaic performance of oligothiophene donors.
DOI10.1039/d0ta00159g
发表期刊JOURNAL OF MATERIALS CHEMISTRY A
ISSN2050-7488
卷号8期号:12页码:5843-5847
通讯作者Singh, Ranbir(ranbir@dongguk.edu) ; Zhong, Cheng(zhongcheng@whu.edu.cn) ; Lu, Shirong(lushirong@cigit.ac.cn)
收录类别SCI
WOS记录号WOS:000526703800031
语种英语