@article{Du:2020:10.1039/d0tc03390a,
author = {Du, T and Xu, W and Xu, S and Ratnasingham, SR and Lin, C-T and Kim, J and Briscoe, J and McLachlan, MA and Durrant, JR},
doi = {10.1039/d0tc03390a},
journal = {Journal of Materials Chemistry C},
pages = {12648--12655},
title = {Light-intensity and thickness dependent efficiency of planar perovskite solar cells: charge recombination versus extraction},
url = {http://dx.doi.org/10.1039/d0tc03390a},
volume = {8},
year = {2020}
}

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TY  - JOUR
AB  - 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.
AU  - Du,T
AU  - Xu,W
AU  - Xu,S
AU  - Ratnasingham,SR
AU  - Lin,C-T
AU  - Kim,J
AU  - Briscoe,J
AU  - McLachlan,MA
AU  - Durrant,JR
DO  - 10.1039/d0tc03390a
EP  - 12655
PY  - 2020///
SN  - 2050-7526
SP  - 12648
TI  - Light-intensity and thickness dependent efficiency of planar perovskite solar cells: charge recombination versus extraction
T2  - Journal of Materials Chemistry C
UR  - http://dx.doi.org/10.1039/d0tc03390a
UR  - https://pubs.rsc.org/en/content/articlelanding/2020/TC/D0TC03390A#!divAbstract
UR  - http://hdl.handle.net/10044/1/82310
VL  - 8
ER  - 

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