On the Origin of the Ideality Factor in Perovskite Solar Cells

Armin, Ardalan; Caprioglio, Pietro; Wolff, Christian M.; Sandberg, Oskar J.; Armin, Ardalan; Rech, Bernd; Albrecht, Steve; Neher, Dieter; Stolterfoht, Martin

doi:10.1002/aenm.202000502

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On the Origin of the Ideality Factor in Perovskite Solar Cells

Ardalan Armin

, Pietro Caprioglio, Christian M. Wolff, Oskar J. Sandberg, Ardalan Armin, Bernd Rech, Steve Albrecht, Dieter Neher, Martin Stolterfoht

Advanced Energy Materials, Volume: 10, Issue: 27, Start page: 2000502

Swansea University Author: Ardalan Armin

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DOI (Published version): 10.1002/aenm.202000502

Abstract

The measurement of the ideality factor (n id) is a popular tool to infer the dominant recombination type in perovskite solar cells (PSC). However, the true meaning of its values is often misinterpreted in complex multilayered devices such as PSC. In this work, the effects of bulk and interface recom...

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Published in:	Advanced Energy Materials
ISSN:	1614-6832 1614-6840
Published:	Wiley 2020
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URI:	https://cronfa.swan.ac.uk/Record/cronfa54425
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spelling	2022-12-05T11:50:45.4047642 v2 54425 2020-06-10 On the Origin of the Ideality Factor in Perovskite Solar Cells 22b270622d739d81e131bec7a819e2fd 0000-0002-6129-5354 Ardalan Armin Ardalan Armin true false 2020-06-10 SPH The measurement of the ideality factor (n id) is a popular tool to infer the dominant recombination type in perovskite solar cells (PSC). However, the true meaning of its values is often misinterpreted in complex multilayered devices such as PSC. In this work, the effects of bulk and interface recombination on the n id are investigated experimentally and theoretically. By coupling intensity‐dependent quasi‐Fermi level splitting measurements with drift diffusion simulations of complete devices and partial cell stacks, it is shown that interfacial recombination leads to a lower n id compared to Shockley–Read–Hall (SRH) recombination in the bulk. As such, the strongest recombination channel determines the n id of the complete cell. An analytical approach is used to rationalize that n id values between 1 and 2 can originate exclusively from a single recombination process. By expanding the study over a wide range of the interfacial energy offsets and interfacial recombination velocities, it is shown that an ideality factor of nearly 1 is usually indicative of strong first‐order non‐radiative interface recombination and that it correlates with a lower device performance. It is only when interface recombination is largely suppressed and bulk SRH recombination dominates that a small n id is again desirable. Journal Article Advanced Energy Materials 10 27 2000502 Wiley 1614-6832 1614-6840 5 6 2020 2020-06-05 10.1002/aenm.202000502 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University 2022-12-05T11:50:45.4047642 2020-06-10T14:30:40.0725443 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Ardalan Armin 0000-0002-6129-5354 1 Pietro Caprioglio 2 Christian M. Wolff 3 Oskar J. Sandberg 4 Ardalan Armin 5 Bernd Rech 6 Steve Albrecht 7 Dieter Neher 8 Martin Stolterfoht 9 54425__17455__ff19f09e8ad14ba7a1bb5c4b10bd4b12.pdf 2020 AM Pietro Ideality.pdf 2020-06-10T14:32:44.4693355 Output 2540315 application/pdf Version of Record true This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. true
title	On the Origin of the Ideality Factor in Perovskite Solar Cells
spellingShingle	On the Origin of the Ideality Factor in Perovskite Solar Cells Ardalan Armin
title_short	On the Origin of the Ideality Factor in Perovskite Solar Cells
title_full	On the Origin of the Ideality Factor in Perovskite Solar Cells
title_fullStr	On the Origin of the Ideality Factor in Perovskite Solar Cells
title_full_unstemmed	On the Origin of the Ideality Factor in Perovskite Solar Cells
title_sort	On the Origin of the Ideality Factor in Perovskite Solar Cells
author_id_str_mv	22b270622d739d81e131bec7a819e2fd
author_id_fullname_str_mv	22b270622d739d81e131bec7a819e2fd_***_Ardalan Armin
author	Ardalan Armin
author2	Ardalan Armin Pietro Caprioglio Christian M. Wolff Oskar J. Sandberg Ardalan Armin Bernd Rech Steve Albrecht Dieter Neher Martin Stolterfoht
format	Journal article
container_title	Advanced Energy Materials
container_volume	10
container_issue	27
container_start_page	2000502
publishDate	2020
institution	Swansea University
issn	1614-6832 1614-6840
doi_str_mv	10.1002/aenm.202000502
publisher	Wiley
college_str	Faculty of Science and Engineering
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hierarchy_top_title	Faculty of Science and Engineering
hierarchy_parent_id	facultyofscienceandengineering
hierarchy_parent_title	Faculty of Science and Engineering
department_str	School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
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description	The measurement of the ideality factor (n id) is a popular tool to infer the dominant recombination type in perovskite solar cells (PSC). However, the true meaning of its values is often misinterpreted in complex multilayered devices such as PSC. In this work, the effects of bulk and interface recombination on the n id are investigated experimentally and theoretically. By coupling intensity‐dependent quasi‐Fermi level splitting measurements with drift diffusion simulations of complete devices and partial cell stacks, it is shown that interfacial recombination leads to a lower n id compared to Shockley–Read–Hall (SRH) recombination in the bulk. As such, the strongest recombination channel determines the n id of the complete cell. An analytical approach is used to rationalize that n id values between 1 and 2 can originate exclusively from a single recombination process. By expanding the study over a wide range of the interfacial energy offsets and interfacial recombination velocities, it is shown that an ideality factor of nearly 1 is usually indicative of strong first‐order non‐radiative interface recombination and that it correlates with a lower device performance. It is only when interface recombination is largely suppressed and bulk SRH recombination dominates that a small n id is again desirable.
published_date	2020-06-05T04:07:57Z
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On the Origin of the Ideality Factor in Perovskite Solar Cells

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