Inhomogeneous Defect Distribution in Mixed-Polytype Metal Halide Perovskites

Young Won Woo, Zhenzhu Li, Young Kwang Jung, Ji Sang Park, Aron Walsh

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

The competition between corner-, edge-, and face-sharing octahedral networks is a cause of phase inhomogeneity in metal halide perovskite thin-films. Here we probe the charged iodine vacancy distribution and transport at the junction between cubic and hexagonal polytypes of CsPbI3 from first-principles materials modeling. We predict a lower defect formation energy in the face-sharing regions, which correlates with a longer Pb-I bond length and causes a million-fold increase in local defect concentration. These defects are predicted to be more mobile in the face-sharing regions with a reduced activation energy for vacancy-mediated diffusion. We conclude that hexagonal phase inclusions or interfaces will act as defect sinks that could influence carrier dynamics in perovskite-based solar cells and electrical devices.

Original languageEnglish
Pages (from-to)356-360
Number of pages5
JournalACS Energy Letters
Volume8
Issue number1
DOIs
StatePublished - 13 Jan 2023

Bibliographical note

Funding Information:
This research was supported by a grant of the Korea Health Technology R&D Project through the Korea Health Industry Development Institute (KHIDI), funded by the Ministry of Health & Welfare, Republic of Korea (grant number: HI19C1344). Computational resources have been provided by the KISTI Supercomputing Center (KSC-2021-CRE-0510). We are also grateful to the UK Materials and Molecular Modelling Hub for computational resources, which is partially funded by EPSRC (EP/P020194/1 and EP/T022213/1).

Publisher Copyright:
© 2022 The Authors. Published by American Chemical Society.

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