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Interpreting time-resolved photoluminescence of perovskite materials

Emmanuel V. Péan, Stoichko Dimitrov, Catherine S. De Castro, Matthew Davies Orcid Logo

Physical Chemistry Chemical Physics, Volume: 22, Issue: 48, Pages: 28345 - 28358

Swansea University Author: Matthew Davies Orcid Logo

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DOI (Published version): 10.1039/d0cp04950f

Abstract

Time-resolved photoluminescence (TRPL) spectroscopy is a powerful technique to investigate excited charge carrier recombinations in semiconductors and molecular systems. The analysis of the TRPL decays of many molecular systems (e.g. molecules and organic materials) is usually fairly straightfoward...

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Published in: Physical Chemistry Chemical Physics
ISSN: 1463-9076 1463-9084
Published: Royal Society of Chemistry (RSC) 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa56027
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spelling 2021-12-01T14:06:25.1376911 v2 56027 2021-01-14 Interpreting time-resolved photoluminescence of perovskite materials 4ad478e342120ca3434657eb13527636 0000-0003-2595-5121 Matthew Davies Matthew Davies true false 2021-01-14 CHEG Time-resolved photoluminescence (TRPL) spectroscopy is a powerful technique to investigate excited charge carrier recombinations in semiconductors and molecular systems. The analysis of the TRPL decays of many molecular systems (e.g. molecules and organic materials) is usually fairly straightfoward and can be fitted with an exponential function allowing extraction of the rate constants. Due to the non-excitonic nature of charge carriers in lead halide perovskite materials coupled with the presence of localised trap states in their band-gap, the TRPL of these materials is much more complicated to interpret. Here we discuss two models used in the literature to simulate charge carrier recombinations and TRPL in perovskites. These models consider the bimolecular nature of direct electron–hole recombination but differ in their treatment of trap-mediated recombination with one model describing trapping as a monomolecular process whereas the other as a bimolecular process between free carriers and the available trap states. In comparison, the classical analysis of perovskite TRPL decay curves (using a sum of exponentials) can lead to misinterpretation. Here we offer some recommendations for meaningful measurements of lead halide perovskite thin-films. The fluence dependence as well as charge carrier accumulation due to incomplete depopulation of all photoexcited carriers between consecutive excitation pulses are discussed for both models. Journal Article Physical Chemistry Chemical Physics 22 48 28345 28358 Royal Society of Chemistry (RSC) 1463-9076 1463-9084 28 12 2020 2020-12-28 10.1039/d0cp04950f COLLEGE NANME Chemical Engineering COLLEGE CODE CHEG Swansea University UKRI EP/S001336/1 2021-12-01T14:06:25.1376911 2021-01-14T09:21:27.3598419 Faculty of Science and Engineering School of Engineering and Applied Sciences - Chemical Engineering Emmanuel V. Péan 1 Stoichko Dimitrov 2 Catherine S. De Castro 3 Matthew Davies 0000-0003-2595-5121 4 56027__19058__e896fb4d25bb4d82ae96ca1e413f74fb.pdf 56027.pdf 2021-01-14T12:07:24.9822681 Output 3487483 application/pdf Accepted Manuscript true 2021-11-23T00:00:00.0000000 true eng http://creativecommons.org/licenses/by-nc-nd/4.0/
title Interpreting time-resolved photoluminescence of perovskite materials
spellingShingle Interpreting time-resolved photoluminescence of perovskite materials
Matthew Davies
title_short Interpreting time-resolved photoluminescence of perovskite materials
title_full Interpreting time-resolved photoluminescence of perovskite materials
title_fullStr Interpreting time-resolved photoluminescence of perovskite materials
title_full_unstemmed Interpreting time-resolved photoluminescence of perovskite materials
title_sort Interpreting time-resolved photoluminescence of perovskite materials
author_id_str_mv 4ad478e342120ca3434657eb13527636
author_id_fullname_str_mv 4ad478e342120ca3434657eb13527636_***_Matthew Davies
author Matthew Davies
author2 Emmanuel V. Péan
Stoichko Dimitrov
Catherine S. De Castro
Matthew Davies
format Journal article
container_title Physical Chemistry Chemical Physics
container_volume 22
container_issue 48
container_start_page 28345
publishDate 2020
institution Swansea University
issn 1463-9076
1463-9084
doi_str_mv 10.1039/d0cp04950f
publisher Royal Society of Chemistry (RSC)
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Chemical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Chemical Engineering
document_store_str 1
active_str 0
description Time-resolved photoluminescence (TRPL) spectroscopy is a powerful technique to investigate excited charge carrier recombinations in semiconductors and molecular systems. The analysis of the TRPL decays of many molecular systems (e.g. molecules and organic materials) is usually fairly straightfoward and can be fitted with an exponential function allowing extraction of the rate constants. Due to the non-excitonic nature of charge carriers in lead halide perovskite materials coupled with the presence of localised trap states in their band-gap, the TRPL of these materials is much more complicated to interpret. Here we discuss two models used in the literature to simulate charge carrier recombinations and TRPL in perovskites. These models consider the bimolecular nature of direct electron–hole recombination but differ in their treatment of trap-mediated recombination with one model describing trapping as a monomolecular process whereas the other as a bimolecular process between free carriers and the available trap states. In comparison, the classical analysis of perovskite TRPL decay curves (using a sum of exponentials) can lead to misinterpretation. Here we offer some recommendations for meaningful measurements of lead halide perovskite thin-films. The fluence dependence as well as charge carrier accumulation due to incomplete depopulation of all photoexcited carriers between consecutive excitation pulses are discussed for both models.
published_date 2020-12-28T04:06:26Z
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