Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 8, Issue 36, Pages 12648-12655Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0tc03390a
Keywords
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Funding
- Stephen and Ana Hui Fellowship (Imperial College London)
- China Scholarship Council
- Global Research Laboratory Program of the National Research Foundation (NRF) - Ministry of Science, ICT AMP
- Future Planning [NRF-2017K1A1A2013153]
- GIST-ICL International Collaboration RD Centre
- EPSRC GCRF project SUNRISE [EP/P032591/1]
- EPSRC Centre for Doctoral Training in Plastic Electronic Materials [EP/L016702/1]
- EPSRC [EP/P032591/1] Funding Source: UKRI
- National Research Foundation of Korea [2017K1A1A2013153] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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