Temperature dependent reversal of phase segregation in mixed-halide perovskites

Understanding the mechanism of light-induced halide segregation in mixed-halide perovskites is essential for their application in multijunction solar cells. Here, photoluminescence spectroscopy is used to uncover how both increases in temperature and light intensity can counteract the halide segrega...

Descrizione completa

Dettagli Bibliografici
Autori principali: Wright, AD, Patel, JB, Johnston, MB, Herz, LM
Natura: Journal article
Lingua:English
Pubblicazione: Wiley 2023
_version_ 1826310771310592000
author Wright, AD
Patel, JB
Johnston, MB
Herz, LM
author_facet Wright, AD
Patel, JB
Johnston, MB
Herz, LM
author_sort Wright, AD
collection OXFORD
description Understanding the mechanism of light-induced halide segregation in mixed-halide perovskites is essential for their application in multijunction solar cells. Here, photoluminescence spectroscopy is used to uncover how both increases in temperature and light intensity can counteract the halide segregation process. It is observed that, with increasing temperature, halide segregation in CH3NH3Pb(Br0.4I0.6)3 first accelerates toward ≈290 K, before slowing down again toward higher temperatures. Such reversal is attributed to the trade-off between the temperature activation of segregation, for example through enhanced ionic migration, and its inhibition by entropic factors. High light intensities meanwhile can also reverse halide segregation; however, this is found to be only a transient process that abates on the time scale of minutes. Overall, these observations pave the way for a more complete model of halide segregation and aid the development of highly efficient and stable perovskite multijunction and concentrator photovoltaics.
first_indexed 2024-03-07T07:56:53Z
format Journal article
id oxford-uuid:070a96b9-8b2f-4467-a7f3-5d3b9aece88d
institution University of Oxford
language English
last_indexed 2024-03-07T07:56:53Z
publishDate 2023
publisher Wiley
record_format dspace
spelling oxford-uuid:070a96b9-8b2f-4467-a7f3-5d3b9aece88d2023-09-04T08:48:55ZTemperature dependent reversal of phase segregation in mixed-halide perovskitesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:070a96b9-8b2f-4467-a7f3-5d3b9aece88dEnglishSymplectic ElementsWiley2023Wright, ADPatel, JBJohnston, MBHerz, LMUnderstanding the mechanism of light-induced halide segregation in mixed-halide perovskites is essential for their application in multijunction solar cells. Here, photoluminescence spectroscopy is used to uncover how both increases in temperature and light intensity can counteract the halide segregation process. It is observed that, with increasing temperature, halide segregation in CH3NH3Pb(Br0.4I0.6)3 first accelerates toward ≈290 K, before slowing down again toward higher temperatures. Such reversal is attributed to the trade-off between the temperature activation of segregation, for example through enhanced ionic migration, and its inhibition by entropic factors. High light intensities meanwhile can also reverse halide segregation; however, this is found to be only a transient process that abates on the time scale of minutes. Overall, these observations pave the way for a more complete model of halide segregation and aid the development of highly efficient and stable perovskite multijunction and concentrator photovoltaics.
spellingShingle Wright, AD
Patel, JB
Johnston, MB
Herz, LM
Temperature dependent reversal of phase segregation in mixed-halide perovskites
title Temperature dependent reversal of phase segregation in mixed-halide perovskites
title_full Temperature dependent reversal of phase segregation in mixed-halide perovskites
title_fullStr Temperature dependent reversal of phase segregation in mixed-halide perovskites
title_full_unstemmed Temperature dependent reversal of phase segregation in mixed-halide perovskites
title_short Temperature dependent reversal of phase segregation in mixed-halide perovskites
title_sort temperature dependent reversal of phase segregation in mixed halide perovskites
work_keys_str_mv AT wrightad temperaturedependentreversalofphasesegregationinmixedhalideperovskites
AT pateljb temperaturedependentreversalofphasesegregationinmixedhalideperovskites
AT johnstonmb temperaturedependentreversalofphasesegregationinmixedhalideperovskites
AT herzlm temperaturedependentreversalofphasesegregationinmixedhalideperovskites