Dual-site mixed layer-structured FAxCs3−xSb2I6Cl3 Pb-free metal halide perovskite solar cells. Issue 30 (6th May 2020)

• Record Type: Journal Article
• Authors: Choi, Yong Kyu; Heo, Jin Hyuck; Hong, Ki-Ha; Im, Sang Hyuk
• Is Part Of: RSC advances. Volume 10:Issue 30(2020)
• Page Start: 17724
• Page End: 17730
• Publication Date: 2020-05-06
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d0ra00787k
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Dual site mixing of FA x Cs3− x Sb2 I6 Cl3 forms stable 2D layer structure. Abstract : Structure engineering of trivalent metal halide perovskites (MHPs) such as A3 Sb2 X9 (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 FACs2 Sb2 I6 Cl3 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 FACs2 Sb2 I6 Cl3 MHP had 2D layer structure and thereby the MHP solar cells exhibited improved short-circuit current density.