Homochiral Asymmetric-Shaped Electron-Transporting Materials for Efficient Non-Fullerene Perovskite Solar Cells

Su Kyo Jung, Jin Hyuck Heo, Dae Woon Lee, Seung Heon Lee, Seung Chul Lee, Woojin Yoon, Hoseop Yun, Dongwook Kim, Jong H. Kim, Sang Hyuk Im, O. Pil Kwon

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8 Citations (Scopus)

Abstract

A design strategy is proposed for electron-transporting materials (ETMs) with homochiral asymmetric-shaped groups for highly efficient non-fullerene perovskite solar cells (PSCs). The electron transporting N,N′-bis[(R)-1-phenylethyl]naphthalene-1,4,5,8-tetracarboxylic diimide (NDI-PhE) consists of two asymmetric-shaped chiral (R)-1-phenylethyl (PhE) groups that act as solubilizing groups by reducing molecular symmetry and increasing the free volume. NDI-PhE exhibits excellent film-forming ability with high solubility in various organic solvents [about two times higher solubility than the widely used fullerene-based phenyl-C 61 -butyric acid methyl ester (PCBM) in o-dichlorobenzene]. NDI-PhE ETM-based inverted PSCs exhibit very high power conversion efficiencies (PCE) of up to 20.5 % with an average PCE of 18.74±0.95 %, which are higher than those of PCBM ETM-based PSCs. The high PCE of NDI-PhE ETM-based PSCs may be attributed to good film-forming abilities and to three-dimensional isotropic electron transporting capabilities. Therefore, introducing homochiral asymmetric-shaped groups onto charge-transporting materials is a good strategy for achieving high device performance.

Original languageEnglish
Pages (from-to)224-230
Number of pages7
JournalChemSusChem
Volume12
Issue number1
DOIs
Publication statusPublished - 2019 Jan 10

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Keywords

  • electron transport
  • energy conversion
  • perovskites
  • solar cells

ASJC Scopus subject areas

  • Environmental Chemistry
  • Chemical Engineering(all)
  • Materials Science(all)
  • Energy(all)

Cite this

Jung, S. K., Heo, J. H., Lee, D. W., Lee, S. H., Lee, S. C., Yoon, W., Yun, H., Kim, D., Kim, J. H., Im, S. H., & Kwon, O. P. (2019). Homochiral Asymmetric-Shaped Electron-Transporting Materials for Efficient Non-Fullerene Perovskite Solar Cells. ChemSusChem, 12(1), 224-230. https://doi.org/10.1002/cssc.201802234