All-small molecule solar cells based on donor molecule optimization with highly enhanced efficiency and stability

Jie Guo; Haijun Bin; Wei Wang; Bingcai Chen; Jing Guo; Rui Sun; Zhi-Guo Zhang; Xuechen Jiao; Yongfang Li; Jie Min

doi:10.1039/C8TA02778A

All-small molecule solar cells based on donor molecule optimization with highly enhanced efficiency and stability†

Jie Guo,^a Haijun Bin,^b Wei Wang,^a Bingcai Chen,^a Jing Guo,^a Rui Sun,^a Zhi-Guo Zhang,

^b Xuechen Jiao,*^c Yongfang Li

*^b and Jie Min

*^a

Author affiliations

* Corresponding authors

^a The Institute for Advanced Studies, Wuhan University, Wuhan 430072, China
E-mail: min.jie@whu.edu.cn

^b CAS Research/Education Center for Excellence in Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
E-mail: liyf@iccas.ac.cn

^c Department of Materials Science and Engineering, Monash University, Australian Synchrotron, Clayton, Victoria, Australia
E-mail: xuechen.jiao@monash.edu

Abstract

In this work, a novel oligomer based on the introduction of alkylthio-thienylenevinylene thiophene (TVT-SR) side groups into benzo[1,2-b:4,5-b′]dithiophene (BDT) as a central donor unit, BDT(TVT-SR)₂, is developed and used as the donor material for all-small molecule OSCs (SM-OSCs) with IDIC as the acceptor. BDT(TVT-SR)₂ exhibits red-shifted absorption, a down-shifted HOMO energy level and higher hole mobility in comparison with its corresponding molecule H11 with alkylthiothienyl side chains. The power conversion efficiency (PCE) of the SM-OSCs based on BDT(TVT-SR)₂:IDIC with thermal annealing (TA) at 110 °C for 10 min reached 11.1%. This TA treatment improves the film morphology, charge transport properties and thus device performance of the SM-OSCs. Besides, these devices show good morphological stability and photo-stability.

Journal of Materials Chemistry A

All-small molecule solar cells based on donor molecule optimization with highly enhanced efficiency and stability†

Abstract

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All-small molecule solar cells based on donor molecule optimization with highly enhanced efficiency and stability

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