Simple and Versatile Non-Fullerene Acceptor Based on Benzothiadiazole and Rhodanine for Organic Solar Cells

Jongho Ahn, Sora Oh, Hyunkyung Lee, Sangjun Lee, Chang Eun Song, Hang Ken Lee, Sang Kyu Lee, Won Wook So, Sang Jin Moon, Eunhee Lim, Won Suk Shin, Jong Cheol Lee

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Most non-fullerene acceptors (NFAs) are designed in a complex planar molecular conformation containing fused aromatic rings in high-efficiency organic solar cells (OSCs). To obtain the final molecules, however, numerous synthetic steps are necessary. In this work, a novel simple-structured NFA containing alkoxy-substituted benzothiadiazole and a rhodanine end group (BTDT2R) is designed and synthesized. We also investigate the photovoltaic properties of BTDT2R-based OSCs employing representative polymer donors (wide band gap and high-crystalline P3HT, medium band gap and semicrystalline PPDT2FBT, and narrow band gap and low-crystalline PTB7-Th) to compare the performance capabilities of fullerene acceptor-based OSCs, which are well matched with various polymer donors. OSCs based on P3HT:BTDT2R, PPDT2FBT:BTDT2R, and PTB7-Th:BTDT2R achieved efficiency as high as 5.09, 6.90, and 8.19%, respectively. Importantly, photoactive films incorporating different forms of optical and molecular ordering characteristics exhibit favorable morphologies by means of solvent vapor annealing. This work suggests that the new n-type organic semiconductor developed here is highly promising as a universal NFA that can be paired with various polymer donors with different optical and crystalline properties.

Original languageEnglish
Pages (from-to)30098-30107
Number of pages10
JournalACS applied materials & interfaces
Volume11
Issue number33
DOIs
StatePublished - 21 Aug 2019

Keywords

  • bandgap
  • crystallinity
  • non-fullerene acceptor
  • organic solar cells
  • simple chemical structure

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