Journal article 743 views 703 downloads
Interpreting time-resolved photoluminescence of perovskite materials
Physical Chemistry Chemical Physics, Volume: 22, Issue: 48, Pages: 28345 - 28358
Swansea University Author:
Matthew Davies
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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...
Published in: | Physical Chemistry Chemical Physics |
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ISSN: | 1463-9076 1463-9084 |
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Royal Society of Chemistry (RSC)
2020
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URI: | https://cronfa.swan.ac.uk/Record/cronfa56027 |
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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 |
2020-12-28T04:10:39Z |
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1763753737299427328 |
score |
11.021648 |