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Probing and Controlling Intragrain Crystallinity for Improved Low Temperature-Processed Perovskite Solar Cells

Tian Du, Claire H. Burgess, Chieh-Ting Lin, Flurin Eisner, Jinhyun Kim, Shengda Xu, Hongkyu Kang Orcid Logo, James Durrant Orcid Logo, Martyn A. McLachlan Orcid Logo

Advanced Functional Materials, Volume: 28, Issue: 51, Start page: 1803943

Swansea University Author: James Durrant Orcid Logo

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DOI (Published version): 10.1002/adfm.201803943

Abstract

Here, previously unobserved nanoscale defects residing within individual grains of solution‐processed methylammonium lead tri‐iodide (CH3NH3PbI3, MAPI) thin films are identified. Using scanning transmission electron microscopy (STEM), the defects inherently associated with the established solution‐p...

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Published in: Advanced Functional Materials
ISSN: 1616-301X
Published: Wiley 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa45968
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first_indexed 2018-11-19T14:28:28Z
last_indexed 2018-12-13T20:01:11Z
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spelling v2 45968 2018-11-19 Probing and Controlling Intragrain Crystallinity for Improved Low Temperature-Processed Perovskite Solar Cells f3dd64bc260e5c07adfa916c27dbd58a 0000-0001-8353-7345 James Durrant James Durrant true false 2018-11-19 MTLS Here, previously unobserved nanoscale defects residing within individual grains of solution‐processed methylammonium lead tri‐iodide (CH3NH3PbI3, MAPI) thin films are identified. Using scanning transmission electron microscopy (STEM), the defects inherently associated with the established solution‐processing methodology are identified, and a facile processing modification to eliminate these defects is introduced. Specifically, defect elimination is achieved by coannealing the as‐deposited MAPI layer with the electron transport layer (phenyl‐C61‐butyric acid methyl, PCBM) resulting in devices that significantly outperform devices prepared using the established methodology—with power conversion efficiencies increasing from 13.6% to 17.4%. The use of transmission electron microscopy allows the correlation of performance enhancements to improved intragrain crystallinity and shows that highly coherent crystallographic orientation results within individual grains when processing is modified. Detailed optoelectronic characterization reveals that the improved intragrain crystallinity drives an improvement of charge collection and a reduction of PEDOT:PSS/perovskite interfacial recombination. The study suggests that the microstructural defects in MAPI, owing to a lack of structural coherence throughout the thickness of thin film, are a significant cause of interfacial recombination. Journal Article Advanced Functional Materials 28 51 1803943 Wiley 1616-301X 1 12 2018 2018-12-01 10.1002/adfm.201803943 http://dx.doi.org/10.1002/adfm.201803943 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2023-06-02T15:11:20.7790265 2018-11-19T09:43:16.4985399 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Tian Du 1 Claire H. Burgess 2 Chieh-Ting Lin 3 Flurin Eisner 4 Jinhyun Kim 5 Shengda Xu 6 Hongkyu Kang 0000-0003-2890-9710 7 James Durrant 0000-0001-8353-7345 8 Martyn A. McLachlan 0000-0003-3136-1661 9
title Probing and Controlling Intragrain Crystallinity for Improved Low Temperature-Processed Perovskite Solar Cells
spellingShingle Probing and Controlling Intragrain Crystallinity for Improved Low Temperature-Processed Perovskite Solar Cells
James Durrant
title_short Probing and Controlling Intragrain Crystallinity for Improved Low Temperature-Processed Perovskite Solar Cells
title_full Probing and Controlling Intragrain Crystallinity for Improved Low Temperature-Processed Perovskite Solar Cells
title_fullStr Probing and Controlling Intragrain Crystallinity for Improved Low Temperature-Processed Perovskite Solar Cells
title_full_unstemmed Probing and Controlling Intragrain Crystallinity for Improved Low Temperature-Processed Perovskite Solar Cells
title_sort Probing and Controlling Intragrain Crystallinity for Improved Low Temperature-Processed Perovskite Solar Cells
author_id_str_mv f3dd64bc260e5c07adfa916c27dbd58a
author_id_fullname_str_mv f3dd64bc260e5c07adfa916c27dbd58a_***_James Durrant
author James Durrant
author2 Tian Du
Claire H. Burgess
Chieh-Ting Lin
Flurin Eisner
Jinhyun Kim
Shengda Xu
Hongkyu Kang
James Durrant
Martyn A. McLachlan
format Journal article
container_title Advanced Functional Materials
container_volume 28
container_issue 51
container_start_page 1803943
publishDate 2018
institution Swansea University
issn 1616-301X
doi_str_mv 10.1002/adfm.201803943
publisher Wiley
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
url http://dx.doi.org/10.1002/adfm.201803943
document_store_str 0
active_str 0
description Here, previously unobserved nanoscale defects residing within individual grains of solution‐processed methylammonium lead tri‐iodide (CH3NH3PbI3, MAPI) thin films are identified. Using scanning transmission electron microscopy (STEM), the defects inherently associated with the established solution‐processing methodology are identified, and a facile processing modification to eliminate these defects is introduced. Specifically, defect elimination is achieved by coannealing the as‐deposited MAPI layer with the electron transport layer (phenyl‐C61‐butyric acid methyl, PCBM) resulting in devices that significantly outperform devices prepared using the established methodology—with power conversion efficiencies increasing from 13.6% to 17.4%. The use of transmission electron microscopy allows the correlation of performance enhancements to improved intragrain crystallinity and shows that highly coherent crystallographic orientation results within individual grains when processing is modified. Detailed optoelectronic characterization reveals that the improved intragrain crystallinity drives an improvement of charge collection and a reduction of PEDOT:PSS/perovskite interfacial recombination. The study suggests that the microstructural defects in MAPI, owing to a lack of structural coherence throughout the thickness of thin film, are a significant cause of interfacial recombination.
published_date 2018-12-01T15:11:19Z
_version_ 1767600375083302912
score 11.014067

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