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

Research output: Contribution to journalArticleResearchpeer-review

28 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)15675-15683
Number of pages9
JournalJournal of Materials Chemistry A
Volume6
Issue number32
DOIs
Publication statusPublished - 1 Jan 2018

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