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Enhancing the stability of organolead halide perovskite films through polymer encapsulation

Barry McKenna, Joel R. Troughton, Trystan Watson Orcid Logo, Rachel C. Evans

RSC Adv., Volume: 7, Issue: 52, Pages: 32942 - 32951

Swansea University Author: Trystan Watson Orcid Logo

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DOI (Published version): 10.1039/C7RA06002E

Abstract

Perovskite solar cells based on organolead halides such as CH3NH3PbX3 (X = Cl, Br, and I) have rapidly established themselves as the frontrunners among emerging photovoltaic technologies. However, their commercial application has been hindered to date in part due to their susceptibility to degradati...

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Published in: RSC Adv.
ISSN: 2046-2069
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa34433
first_indexed 2017-06-21T20:14:18Z
last_indexed 2018-02-09T05:24:33Z
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spelling 2017-08-14T16:43:45.7378533 v2 34433 2017-06-21 Enhancing the stability of organolead halide perovskite films through polymer encapsulation a210327b52472cfe8df9b8108d661457 0000-0002-8015-1436 Trystan Watson Trystan Watson true false 2017-06-21 EAAS Perovskite solar cells based on organolead halides such as CH3NH3PbX3 (X = Cl, Br, and I) have rapidly established themselves as the frontrunners among emerging photovoltaic technologies. However, their commercial application has been hindered to date in part due to their susceptibility to degradation by UV radiation or heat in the presence of moisture. Herein we investigate the relationship between the physical properties of several polymer encapsulants (poly(methylmethacrylate) (PMMA), ethyl cellulose, polycarbonate and poly(4-methyl-1-pentene)) and their ability to function as barrier layers to improve the stability of CH3NH3PbI3−xClx films under prolonged thermal degradation at 60 °C, 80 °C and 100 °C. In all cases, polymer-coated CH3NH3PbI3−xClx films showed retarded thermal degradation compared to the uncoated films, as indicated by the quantitative decay of the perovskite band edge in the UV/Vis absorption spectrum and the appearance of PbI2 peaks in the powder X-ray diffraction pattern. However, the extent of this reduction was highly dependent on the physical properties of the polymer encapsulant. Notably, PMMA-coated CH3NH3PbI3−xClx films showed no visible signs of degradation to PbI2 after extended heating at 60 °C. However, concomitant studies by epifluorescence microscopy (FM) revealed deterioration of the CH3NH3PbI3−xClx film quality, even in the presence of a polymer-coating, at much shorter heating times (29 h), as evidenced by quenching of the film fluorescence, which was attributed to grain aggregation and the formation of associated non-radiative trap sites. Since grain aggregation occurs on a shorter timescale than chemical degradation to PbI2, this may be the limiting factor in determining the resistance of organolead halide perovskite films to thermal degradation. Journal Article RSC Adv. 7 52 32942 32951 2046-2069 31 12 2017 2017-12-31 10.1039/C7RA06002E COLLEGE NANME Engineering and Applied Sciences School COLLEGE CODE EAAS Swansea University 2017-08-14T16:43:45.7378533 2017-06-21T16:08:03.3111879 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Barry McKenna 1 Joel R. Troughton 2 Trystan Watson 0000-0002-8015-1436 3 Rachel C. Evans 4 0034433-14082017164312.pdf McKenna.pdf 2017-08-14T16:43:12.9770000 Output 1200007 application/pdf Version of Record true 2017-08-14T00:00:00.0000000 true eng
title Enhancing the stability of organolead halide perovskite films through polymer encapsulation
spellingShingle Enhancing the stability of organolead halide perovskite films through polymer encapsulation
Trystan Watson
title_short Enhancing the stability of organolead halide perovskite films through polymer encapsulation
title_full Enhancing the stability of organolead halide perovskite films through polymer encapsulation
title_fullStr Enhancing the stability of organolead halide perovskite films through polymer encapsulation
title_full_unstemmed Enhancing the stability of organolead halide perovskite films through polymer encapsulation
title_sort Enhancing the stability of organolead halide perovskite films through polymer encapsulation
author_id_str_mv a210327b52472cfe8df9b8108d661457
author_id_fullname_str_mv a210327b52472cfe8df9b8108d661457_***_Trystan Watson
author Trystan Watson
author2 Barry McKenna
Joel R. Troughton
Trystan Watson
Rachel C. Evans
format Journal article
container_title RSC Adv.
container_volume 7
container_issue 52
container_start_page 32942
publishDate 2017
institution Swansea University
issn 2046-2069
doi_str_mv 10.1039/C7RA06002E
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 - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str 1
active_str 0
description Perovskite solar cells based on organolead halides such as CH3NH3PbX3 (X = Cl, Br, and I) have rapidly established themselves as the frontrunners among emerging photovoltaic technologies. However, their commercial application has been hindered to date in part due to their susceptibility to degradation by UV radiation or heat in the presence of moisture. Herein we investigate the relationship between the physical properties of several polymer encapsulants (poly(methylmethacrylate) (PMMA), ethyl cellulose, polycarbonate and poly(4-methyl-1-pentene)) and their ability to function as barrier layers to improve the stability of CH3NH3PbI3−xClx films under prolonged thermal degradation at 60 °C, 80 °C and 100 °C. In all cases, polymer-coated CH3NH3PbI3−xClx films showed retarded thermal degradation compared to the uncoated films, as indicated by the quantitative decay of the perovskite band edge in the UV/Vis absorption spectrum and the appearance of PbI2 peaks in the powder X-ray diffraction pattern. However, the extent of this reduction was highly dependent on the physical properties of the polymer encapsulant. Notably, PMMA-coated CH3NH3PbI3−xClx films showed no visible signs of degradation to PbI2 after extended heating at 60 °C. However, concomitant studies by epifluorescence microscopy (FM) revealed deterioration of the CH3NH3PbI3−xClx film quality, even in the presence of a polymer-coating, at much shorter heating times (29 h), as evidenced by quenching of the film fluorescence, which was attributed to grain aggregation and the formation of associated non-radiative trap sites. Since grain aggregation occurs on a shorter timescale than chemical degradation to PbI2, this may be the limiting factor in determining the resistance of organolead halide perovskite films to thermal degradation.
published_date 2017-12-31T13:16:22Z
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