High-performance organic solar cells based on polymer donor/small molecule donor/nonfullerene acceptor ternary blends

Shuixing Dai, Sreelakshmi Chandrabose, Jingming Xin, Tengfei Li, Kai Chen, Peiyao Xue, Kuan Liu, Ke Zhou, Wei Ma, Justin M. Hodgkiss, Xiaowei Zhan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

33 Citations (Scopus)

Abstract

We used mid-bandgap small molecule donor TR as a third component to fabricate ternary nonfullerene organic solar cells (OSCs) based on narrow-bandgap polymer donor PTB7-Th and narrow-bandgap nonfullerene acceptor FOIC. TR exhibits full miscibility with PTB7-Th and efficient energy transfer to PTB7-Th, enhances stacking of PTB7-Th, hole mobility and charge generation of the blends, and ultimately improves device performance. Compared with the binary PTB7-Th/FOIC blend, the ternary device with 25% TR (w/w) yields simultaneously improved open-circuit voltage, short-circuit current density and fill factor. Finally, single-junction OSCs based on the ternary PTB7-Th/TR/FOIC blend yield power conversion efficiency as high as 13.1%, higher than the binary OSCs (12.1%). The ternary device efficiency exhibits high tolerance to thickness variation (>12% in the range of 80-200 nm). Transient absorption spectroscopy confirms the importance of long-range resonant energy transfer from donor to acceptor phases.

Original languageEnglish
Pages (from-to)2268-2274
Number of pages7
JournalJournal of Materials Chemistry A
Volume7
Issue number5
DOIs
Publication statusPublished - Jan 2019

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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