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

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


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
Issue number1
Publication statusPublished - 2019 Jan 10

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning and the Ministry of Education, Korea (Basic Science Research Program; Nos. 2014R1A5A1009799 and 2018R1D1A1B07047645) and Global Frontier R&D Program on Center for Multiscale Energy System (No. 2012M3A6A7054855).

Publisher Copyright:
© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim


  • electron transport
  • energy conversion
  • perovskites
  • solar cells

ASJC Scopus subject areas

  • Environmental Chemistry
  • General Chemical Engineering
  • General Materials Science
  • General Energy


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