Tuning photoelectric conversion in hybrid perovskites by thermal cycling

Shengjian Qin (Co-first Author), Hang Su (Co-first Author), Yinan Jiao (Co-first Author), Jiale Meng, Jiayu Song, Jinjin Zhao*, Jian Lu*

*Corresponding author for this work

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

Abstract

The successful commercialization of perovskite photovoltaics requires comprehension of the effects of fatigue aging on the photoelectric performance of the devices through frequency of temperature variation tests. In this study, the effects of thermal cycling between room temperature (RT) and 60 °C (RT-thermal cycling) on the photoelectric performance of classical methylammonium lead iodide (MAPbI3) perovskite films are investigated. After the first thermal cycle, the films exhibit a moderate compressive strain of 1.08% along the [110] direction, resulting in a minimal bandgap (1.585 eV), reduced defect density, and an extended carrier lifetime (16.27 ns). The photovoltaic device using this perovskite film as the absorber layer demonstrates a maximum photocurrent of 35.63 μA. Theoretical calculations suggest that a moderate compressive strain along the [110] direction in the tetragonal MAPbI3 phase reduces both the bandgap and effective carrier mass while increasing the formation energy of iodine vacancies. These changes enhance the light-absorption and carrier-transport efficiency. Strain engineering through RT-thermal cycling can facilitate large-scale market-oriented applications of perovskite-based photoelectric devices. © 2025 The Royal Society of Chemistry.
Original languageEnglish
Pages (from-to)8843-8851
JournalJournal of Materials Chemistry A
Volume13
Issue number12
Online published18 Feb 2025
DOIs
Publication statusPublished - 28 Mar 2025

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