Dual-site mixed layer-structured FAxCs3- x Sb2I6Cl3Pb-free metal halide perovskite solar cells

Yong Kyu Choi, Jin Hyuck Heo, Ki Ha Hong, Sang Hyuk Im

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Structure engineering of trivalent metal halide perovskites (MHPs) such as A3Sb2X9 (A = a monovalent cation such as methyl ammonium (MA), cesium (Cs), and formamidinium (FA) and X = a halogen such as I, Br, and Cl) is of great interest because a two dimensional (2D) layer structure with direct bandgap has narrower bandgap energy than a zero dimensional (0D) dimer structure with indirect bandgap. Here, we demonstrated 2D layer structured FACs2Sb2I6Cl3 MHP by dual-site (A and X site) mixing. Thanks to the lattice-symmetry change by I-Cl mixed halide, the shortest ionic radius of Cs, and the lower solution energy due to dual-site mixing, the FACs2Sb2I6Cl3 MHP had 2D layer structure and thereby the MHP solar cells exhibited improved short-circuit current density.

Original languageEnglish
Pages (from-to)17724-17730
Number of pages7
JournalRSC Advances
Issue number30
Publication statusPublished - 2020 May 6

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)


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