Heterogeneous Supersaturation in Mixed Perovskites

Chih Shan Tan, Yi Hou, Makhsud I. Saidaminov, Andrew Proppe, Yu Sheng Huang, Yicheng Zhao, Mingyang Wei, Grant Walters, Ziyun Wang, Yongbiao Zhao, Petar Todorovic, Shana O. Kelley, Lih Juann Chen*, Edward H. Sargent

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Thin-film solar cells based on hybrid lead halide perovskites have achieved certified power conversion efficiencies exceeding 24%, approaching those of crystalline silicon. This motivates deeper studies of the mechanisms that determine their performance. Twin defect sites have been proposed as a source of traps in perovskites, yet their origin and influence on photovoltaic performance remain unclear. It is found that twin defects—observed herein via both transmission electron microscopy and X-ray diffraction—are correlated with the amount of antisolvent added to the perovskite and that twin defects in the highest-performing perovskite photovoltaics are suppressed. Heterogeneous supersaturation nucleation is discussed as a contributor to efficient perovskite-based optoelectronic devices.

Original languageEnglish (US)
Article number1903166
JournalAdvanced Science
Issue number7
StatePublished - Apr 1 2020
Externally publishedYes


  • defects
  • perovskites
  • traps
  • twins

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Chemical Engineering(all)
  • Biochemistry, Genetics and Molecular Biology (miscellaneous)
  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)


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