Interplay of Static and Dynamic Disorder in the Mixed-Metal Chalcohalide Sn2SbS2I3

Adair Nicolson, Joachim Breternitz, Seán R. Kavanagh, Yvonne Tomm, Kazuki Morita, Alexander G. Squires, Michael Tovar, Aron Walsh, Susan Schorr, David O. Scanlon

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Chalcohalide mixed-anion crystals have seen a rise in interest as “perovskite-inspired materials” with the goal of combining the ambient stability of metal chalcogenides with the exceptional optoelectronic performance of metal halides. Sn2SbS2I3 is a promising candidate, having achieved a photovoltaic power conversion efficiency above 4%. However, there is uncertainty over the crystal structure and physical properties of this crystal family. Using a first-principles cluster expansion approach, we predict a disordered room-temperature structure, comprising both static and dynamic cation disorder on different crystallographic sites. These predictions are confirmed using single-crystal X-ray diffraction. Disorder leads to a lowering of the bandgap from 1.8 eV at low temperature to 1.5 eV at the experimental annealing temperature of 573 K. Cation disorder tailoring the bandgap allows for targeted application or for the use in a graded solar cell, which when combined with material properties associated with defect and disorder tolerance, encourages further investigation into the group IV/V chalcohalide family for optoelectronic applications.

Original languageEnglish
Pages (from-to)12509-12517
Number of pages9
JournalJournal of the American Chemical Society
Volume145
Issue number23
DOIs
StatePublished - 14 Jun 2023

Bibliographical note

Publisher Copyright:
© 2023 The Authors. Published by American Chemical Society.

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