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Light-intensity and thickness dependent efficiency of planar perovskite solar cells: charge recombination versus extraction

Tian Du, Weidong Xu, Shengda Xu, Sinclair R. Ratnasingham, Chieh-Ting Lin, Jinhyun Kim, Joe Briscoe, Martyn A. McLachlan, James Durrant Orcid Logo

Journal of Materials Chemistry C, Volume: 8, Issue: 36, Pages: 12648 - 12655

Swansea University Author: James Durrant Orcid Logo

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DOI (Published version): 10.1039/d0tc03390a

Abstract

Photoactive layer thickness is a key parameter for optimization of photovoltaic power conversion efficiency (PCE), yet its impact on charge extraction and recombination hasn’t been fully understood in perovskite solar cells (PSCs). Herein we find that in planar PSCs the perovskite thickness yielding...

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Published in: Journal of Materials Chemistry C
ISSN: 2050-7526 2050-7534
Published: Royal Society of Chemistry (RSC) 2020
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa55400
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Abstract: Photoactive layer thickness is a key parameter for optimization of photovoltaic power conversion efficiency (PCE), yet its impact on charge extraction and recombination hasn’t been fully understood in perovskite solar cells (PSCs). Herein we find that in planar PSCs the perovskite thickness yielding maximal PCE is strongly light-intensity dependent. Whilst under 1 sun irradiation the PCE is relatively invariant for perovskite thicknesses between 250 to 750 nm, at lower light intensities (0.1–0.5 sun) the thickest devices yield strongly enhanced PCE, but at higher light intensities (>1 sun) the thinnest devices give optimal PCE. Our results unravel that increased perovskite thickness leads to enhanced light absorption, reduced interfacial recombination at open circuit but greater bimolecular recombination losses at short circuit thus is suitable for devices working under weak illumination, typical of many real-world applications. Reducing perovskite thickness, however, shows the contrast trend and is suitable for PSCs working under concentrated illumination.
College: Faculty of Science and Engineering
Funders: EPSRC, NRF
Issue: 36
Start Page: 12648
End Page: 12655

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