On the Question of the Need for a Built‐In Potential in Perovskite Solar Cells

Sandberg, Oskar; Kurpiers, Jona; Stolterfoht, Martin; Neher, Dieter; Meredith, Paul; Shoaee, Safa; Armin, Ardalan

doi:10.1002/admi.202000041

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On the Question of the Need for a Built‐In Potential in Perovskite Solar Cells

Oskar Sandberg

, Jona Kurpiers, Martin Stolterfoht, Dieter Neher, Paul Meredith

, Safa Shoaee, Ardalan Armin

Advanced Materials Interfaces, Volume: 7, Issue: 10, Start page: 2000041

Swansea University Authors: Oskar Sandberg , Paul Meredith , Ardalan Armin

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DOI (Published version): 10.1002/admi.202000041

Abstract

Perovskite semiconductors as the active materials in efficient solar cells exhibit free carrier diffusion lengths on the order of microns at low illumination fluxes and many hundreds of nanometers under 1 sun conditions. These lengthscales are significantly larger than typical junction thicknesses,...

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Published in:	Advanced Materials Interfaces
ISSN:	2196-7350 2196-7350
Published:	Wiley 2020
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URI:	https://cronfa.swan.ac.uk/Record/cronfa53844
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first_indexed	2020-04-03T14:08:18Z
last_indexed	2023-01-11T14:31:36Z
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spelling	2022-12-05T12:38:16.1122315 v2 53844 2020-03-21 On the Question of the Need for a Built‐In Potential in Perovskite Solar Cells 9e91512a54d5aee66cd77851a96ba747 0000-0003-3778-8746 Oskar Sandberg Oskar Sandberg true false 31e8fe57fa180d418afd48c3af280c2e 0000-0002-9049-7414 Paul Meredith Paul Meredith true false 22b270622d739d81e131bec7a819e2fd 0000-0002-6129-5354 Ardalan Armin Ardalan Armin true false 2020-03-21 SPH Perovskite semiconductors as the active materials in efficient solar cells exhibit free carrier diffusion lengths on the order of microns at low illumination fluxes and many hundreds of nanometers under 1 sun conditions. These lengthscales are significantly larger than typical junction thicknesses, and thus the carrier transport and charge collection should be expected to be diffusion controlled. A consensus along these lines is emerging in the field. However, the question as to whether the built-in potential plays any role is still of matter of some conjecture. This important question using phase-sensitive photocurrent measurements and theoretical device simulations based upon the drift-diffusion framework is addressed. In particular, the role of the built-in electric field and charge-selective transport layers in state-of-the-art p–i–n perovskite solar cells comparing experimental findings and simulation predictions is probed. It is found that while charge collection in the junction does not require a drift field per se, a built-in potential is still needed to avoid the formation of reverse electric fields inside the active layer, and to ensure efficient extraction through the charge transport layers. Journal Article Advanced Materials Interfaces 7 10 2000041 Wiley 2196-7350 2196-7350 20 5 2020 2020-05-20 10.1002/admi.202000041 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University European Regional Development Fund Welsh European Funding Office Swansea University strategic initiative in Sustainable Advanced Materials 2022-12-05T12:38:16.1122315 2020-03-21T13:34:44.7801557 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Oskar Sandberg 0000-0003-3778-8746 1 Jona Kurpiers 2 Martin Stolterfoht 3 Dieter Neher 4 Paul Meredith 0000-0002-9049-7414 5 Safa Shoaee 6 Ardalan Armin 0000-0002-6129-5354 7 53844__16882__2cd424fc8ab0466da6b8866254206c47.pdf 2020 ACDC.pdf 2020-03-21T13:43:10.0439538 Output 1504118 application/pdf Version of Record true Released under the terms of a Creative Commons Attribution License (CC-BY). true eng http://creativecommons.org/licenses/by/4.0/
title	On the Question of the Need for a Built‐In Potential in Perovskite Solar Cells
spellingShingle	On the Question of the Need for a Built‐In Potential in Perovskite Solar Cells Oskar Sandberg Paul Meredith Ardalan Armin
title_short	On the Question of the Need for a Built‐In Potential in Perovskite Solar Cells
title_full	On the Question of the Need for a Built‐In Potential in Perovskite Solar Cells
title_fullStr	On the Question of the Need for a Built‐In Potential in Perovskite Solar Cells
title_full_unstemmed	On the Question of the Need for a Built‐In Potential in Perovskite Solar Cells
title_sort	On the Question of the Need for a Built‐In Potential in Perovskite Solar Cells
author_id_str_mv	9e91512a54d5aee66cd77851a96ba747 31e8fe57fa180d418afd48c3af280c2e 22b270622d739d81e131bec7a819e2fd
author_id_fullname_str_mv	9e91512a54d5aee66cd77851a96ba747_*_Oskar Sandberg 31e8fe57fa180d418afd48c3af280c2e__Paul Meredith 22b270622d739d81e131bec7a819e2fd_**_Ardalan Armin
author	Oskar Sandberg Paul Meredith Ardalan Armin
author2	Oskar Sandberg Jona Kurpiers Martin Stolterfoht Dieter Neher Paul Meredith Safa Shoaee Ardalan Armin
format	Journal article
container_title	Advanced Materials Interfaces
container_volume	7
container_issue	10
container_start_page	2000041
publishDate	2020
institution	Swansea University
issn	2196-7350 2196-7350
doi_str_mv	10.1002/admi.202000041
publisher	Wiley
college_str	Faculty of Science and Engineering
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hierarchy_top_title	Faculty of Science and Engineering
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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	Perovskite semiconductors as the active materials in efficient solar cells exhibit free carrier diffusion lengths on the order of microns at low illumination fluxes and many hundreds of nanometers under 1 sun conditions. These lengthscales are significantly larger than typical junction thicknesses, and thus the carrier transport and charge collection should be expected to be diffusion controlled. A consensus along these lines is emerging in the field. However, the question as to whether the built-in potential plays any role is still of matter of some conjecture. This important question using phase-sensitive photocurrent measurements and theoretical device simulations based upon the drift-diffusion framework is addressed. In particular, the role of the built-in electric field and charge-selective transport layers in state-of-the-art p–i–n perovskite solar cells comparing experimental findings and simulation predictions is probed. It is found that while charge collection in the junction does not require a drift field per se, a built-in potential is still needed to avoid the formation of reverse electric fields inside the active layer, and to ensure efficient extraction through the charge transport layers.
published_date	2020-05-20T04:07:01Z
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On the Question of the Need for a Built‐In Potential in Perovskite Solar Cells

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