Chiral Stereoisomer Engineering of Electron Transporting Materials for Efficient and Stable Perovskite Solar Cells

Su Kyo Jung, Jin Hyuck Heo, Byeong M. Oh, Jong Bum Lee, Sung Ha Park, Woojin Yoon, Yunmi Song, Hoseop Yun, Jong H. Kim, Sang Hyuk Im, O. Pil Kwon

Research output: Contribution to journalArticle

Abstract

A series of chiral stereoisomers of electron transporting materials with two chiral substituents is rationally designed and synthesized, and the influence of stereoisomerism on their physical and electronic properties is investigated to demonstrate highly efficient and stable perovskite solar cells (PSCs). Compared to mesomeric naphthalene diimide (NDI) derivatives, which have heterochiral side groups with centrosymmetric molecular packing of symmetric-shaped conformers in the crystalline state, enantiomeric NDI derivatives have homochiral side groups that exhibit non-centrosymmetric molecular packing of asymmetric-shaped conformers in the crystalline state and exhibit better solution processability based on one order of magnitude higher solubility. A similar trend is observed in different rylene diimide stereoisomers based on larger semiconducting core perylene diimide. The PSCs based on NDI enantiomers with good film-forming ability and a very high lowest phase transition temperature (Tlowest) of 321 °C exhibit a high and uniform average power conversion efficiency (PCE) of 19.067 ± 0.654%. These PSCs also have a high temporal device stability, with less than 10% degradation of the PCE at 100 °C for 1000 h without encapsulation. Therefore, chiral stereoisomer engineering of charge transporting materials is a potential approach to achieve high solution processability, excellent performance, and significant temporal stability in organic electronic devices.

Original languageEnglish
Article number1905951
JournalAdvanced Functional Materials
DOIs
Publication statusAccepted/In press - 2020 Jan 1

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Keywords

  • chirality
  • electron transporting materials
  • perovskite solar cells
  • stereoisomers

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Jung, S. K., Heo, J. H., Oh, B. M., Lee, J. B., Park, S. H., Yoon, W., ... Kwon, O. P. (Accepted/In press). Chiral Stereoisomer Engineering of Electron Transporting Materials for Efficient and Stable Perovskite Solar Cells. Advanced Functional Materials, [1905951]. https://doi.org/10.1002/adfm.201905951