Efficient and mechanically robust ultraflexible organic solar cells based on mixed acceptors

Wenchao Huang, Zhi Jiang, Kenjiro Fukuda, Xuechen Jiao, Christopher R. McNeill, Tomoyuki Yokota, Takao Someya

Research output: Contribution to journalArticleResearchpeer-review

24 Citations (Scopus)

Abstract

Ultraflexible organic solar cells (OSCs) are considered a promising power source for wearable electronic systems owing to their robust mechanical properties, low cost, and light weight. The proper selection of active layer materials and the optimization of morphology are two key factors to simultaneously achieve high efficiency and robust mechanical stability in ultraflexible OSCs. Here, a facile approach that employs a fullerene/non-fullerene mixed acceptor is reported to enhance charge separation and transport and to optimize the morphology of the active layer with more amorphous regions. By using this strategy, 3-μm-thick ultraflexible OSCs achieve a power conversion efficiency (PCE) of 13% with a certified value of 12.3%. In addition, ultraflexible OSCs exhibit a 97% retention in the PCE after 1,000 cycles of a bending test with a bending radius of 0.5 mm and an 89% retention in the PCE after 1,000 cycles of a compression-stretching test with a bending radius of 10 μm.

Original languageEnglish
Pages (from-to)128-141
Number of pages14
JournalJoule
Volume4
Issue number1
DOIs
Publication statusPublished - 15 Jan 2020

Keywords

  • flexible solar cell
  • mechanical stability
  • morphology
  • non-fullerene acceptor
  • organic solar cell
  • ternary blend

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