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Shining a light on the photochemistry of methylammonium lead iodide perovskite for solar cell application / EMMANUEL PEAN

Swansea University Author: EMMANUEL PEAN

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DOI (Published version): 10.23889/SUthesis.58582

Abstract

Since their first use in solar cells in 2009, lead halide perovskites have been employed in a wide variety of solar cell architectures leading to an impressive 25.5 % power conversion efficiency in 2020. However, the complex properties of perovskite materials as well as their instability in ambient...

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Published: Swansea 2021
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
Supervisor: Davies, Matthew L. ; Durrant, James
URI: https://cronfa.swan.ac.uk/Record/cronfa58582
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spelling 2021-11-08T16:36:38.9689086 v2 58582 2021-11-08 Shining a light on the photochemistry of methylammonium lead iodide perovskite for solar cell application ba4ea45678c70ac54496889b477492b5 EMMANUEL PEAN EMMANUEL PEAN true false 2021-11-08 Since their first use in solar cells in 2009, lead halide perovskites have been employed in a wide variety of solar cell architectures leading to an impressive 25.5 % power conversion efficiency in 2020. However, the complex properties of perovskite materials as well as their instability in ambient atmosphere is impeding their development. In particular, trap states, through their formation and passivation, are believed to be responsible for the instability and subsequent degradation of the perovskite, as well as decreasing the device performances. In this work, 3 aspects of the methylammonium lead iodide (MAPI) perovskite are investigated. First, the steady-state photoluminescence and degradation of MAPI were investigated using fluorescence spectroscopy, microscopy, and X-ray diffractometry. Photobrightening, due to the passivation of trap states, and photodarkening, due to the degradation of the perovskite by moisture and oxygen, are found to be competing processes, making the onset of degradation difficult to accurately determine. Second, two models used to simulate charge carrier recombination and time-resolved photoluminescence (TRPL) in perovskite materials, and extract information related to trap states are investigated. The importance of the excitation fluence and repetition period used is highlighted. The models are then used to fit TRPL decays of a MAPI thin-film and a bimolecular rate constant of ∼ 50 × 10−20 cm3/ns is obtained. Finally, the optical, morphological, photoluminescence and crystallographic properties, and stability of MAPI and 5-aminovaleric acid iodide-modified MAPI (AVA-MAPI) infiltrated in mesoporous carbon perovskite solar cells are investigated. Superoxide formation was measured using the dihydroethidium fluorescence probe and AVA-MAPI is shown to generate less superoxide than MAPI when infiltrated in mesoporous layers (ZrO2, TiO2/ZrO2 and TiO2/ZrO2/C). This is partially explained by the presence of a uniform capping layer in AVA-MAPI, hindering oxygen diffusion in the film hence reducing superoxide formation. E-Thesis Swansea Perovskites, photochemistry, solar cells, superoxide, photoluminescence, recombinations 8 11 2021 2021-11-08 10.23889/SUthesis.58582 ORCiD identifier: https://orcid.org/0000-0002-3056-5286 COLLEGE NANME COLLEGE CODE Swansea University Davies, Matthew L. ; Durrant, James Doctoral Ph.D Zienkiewicz Scholarship, Sêr Cymru Solar initiative and the Material and Manufacturing Academy (M2A) 2021-11-08T16:36:38.9689086 2021-11-08T15:15:11.6179381 College of Engineering Engineering EMMANUEL PEAN 1 58582__21456__cebd0bf239c44de294b21e8fb2a36dcd.pdf Pean_Emmanuel_PhD_Thesis_Final_Redacted_Signatures.pdf 2021-11-08T16:15:56.6629591 Output 95300405 application/pdf E-Thesis – open access true Shining a light on the photochemistry of methylammonium lead iodide perovskite for solar cell application © 2020 by Emmanuel V. Péan is licensed under a CC BY-NC license. true eng
title Shining a light on the photochemistry of methylammonium lead iodide perovskite for solar cell application
spellingShingle Shining a light on the photochemistry of methylammonium lead iodide perovskite for solar cell application
EMMANUEL PEAN
title_short Shining a light on the photochemistry of methylammonium lead iodide perovskite for solar cell application
title_full Shining a light on the photochemistry of methylammonium lead iodide perovskite for solar cell application
title_fullStr Shining a light on the photochemistry of methylammonium lead iodide perovskite for solar cell application
title_full_unstemmed Shining a light on the photochemistry of methylammonium lead iodide perovskite for solar cell application
title_sort Shining a light on the photochemistry of methylammonium lead iodide perovskite for solar cell application
author_id_str_mv ba4ea45678c70ac54496889b477492b5
author_id_fullname_str_mv ba4ea45678c70ac54496889b477492b5_***_EMMANUEL PEAN
author EMMANUEL PEAN
author2 EMMANUEL PEAN
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hierarchy_parent_title College of Engineering
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description Since their first use in solar cells in 2009, lead halide perovskites have been employed in a wide variety of solar cell architectures leading to an impressive 25.5 % power conversion efficiency in 2020. However, the complex properties of perovskite materials as well as their instability in ambient atmosphere is impeding their development. In particular, trap states, through their formation and passivation, are believed to be responsible for the instability and subsequent degradation of the perovskite, as well as decreasing the device performances. In this work, 3 aspects of the methylammonium lead iodide (MAPI) perovskite are investigated. First, the steady-state photoluminescence and degradation of MAPI were investigated using fluorescence spectroscopy, microscopy, and X-ray diffractometry. Photobrightening, due to the passivation of trap states, and photodarkening, due to the degradation of the perovskite by moisture and oxygen, are found to be competing processes, making the onset of degradation difficult to accurately determine. Second, two models used to simulate charge carrier recombination and time-resolved photoluminescence (TRPL) in perovskite materials, and extract information related to trap states are investigated. The importance of the excitation fluence and repetition period used is highlighted. The models are then used to fit TRPL decays of a MAPI thin-film and a bimolecular rate constant of ∼ 50 × 10−20 cm3/ns is obtained. Finally, the optical, morphological, photoluminescence and crystallographic properties, and stability of MAPI and 5-aminovaleric acid iodide-modified MAPI (AVA-MAPI) infiltrated in mesoporous carbon perovskite solar cells are investigated. Superoxide formation was measured using the dihydroethidium fluorescence probe and AVA-MAPI is shown to generate less superoxide than MAPI when infiltrated in mesoporous layers (ZrO2, TiO2/ZrO2 and TiO2/ZrO2/C). This is partially explained by the presence of a uniform capping layer in AVA-MAPI, hindering oxygen diffusion in the film hence reducing superoxide formation.
published_date 2021-11-08T04:15:21Z
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