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Investigating spatial macroscopic metastability of perovskite solar cells with voltage dependent photoluminescence imaging

George Koutsourakis Orcid Logo, Carys Worsley, Michael Spence, James C Blakesley, Trystan Watson Orcid Logo, Matt Carnie Orcid Logo, Fernando A Castro Orcid Logo

Journal of Physics: Energy, Volume: 5, Issue: 2, Start page: 025008

Swansea University Authors: Carys Worsley, Michael Spence, Trystan Watson Orcid Logo, Matt Carnie Orcid Logo

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Abstract

Metastability is a characteristic feature of perovskite solar cell (PSC) devices that affects powerrating measurements and general electrical behaviour. In this work the metastability of differenttypes of PSC devices is investigated through current–voltage (I–V) testing and voltage dependentphotolum...

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Published in: Journal of Physics: Energy
ISSN: 2515-7655
Published: IOP Publishing 2023
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa66403
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Abstract: Metastability is a characteristic feature of perovskite solar cell (PSC) devices that affects powerrating measurements and general electrical behaviour. In this work the metastability of differenttypes of PSC devices is investigated through current–voltage (I–V) testing and voltage dependentphotoluminescence (PL-V) imaging. We show that advanced I–V parameter acquisition methodsneed to be applied for accurate PSC performance evaluation, and that misleading results can beobtained when using simple fast I–V curves, which can lead to incorrect estimation of cellefficiency. The method, as applied in this work, can also distinguish between metastability anddegradation, which is a crucial step towards reporting stabilised efficiencies of PSC devices. PL-V isthen used to investigate temporal and spatial PL response at different voltage steps. In addition tothe impact on current response, metastability effects are clearly observed in the spatial PL responseof different types of PSCs. The results imply that a high density of local defects andnon-uniformities leads to increased lateral metastability visible in PL-V measurements, which isdirectly linked to electrical metastability. This work indicates that existing quantitative PL imagingmethods and point-based PL measurements of PSC devices may need to be revisited, asassumptions such as the absence of lateral currents or uniform voltage bias across a cell area maynot be valid.
Keywords: perovskite solar cells, measurements, photoluminescence imaging, metastability
College: Faculty of Science and Engineering
Funders: The work was co-funded by the UK Engineering and Physical Sciences Research Council (EPSRC) funded project ‘Application Targeted and Integrated Photovoltaics (ATIP)’ (Grant No. EP/T028513/1) and by the Department for Science, Innovation & Technology (UK) through the National Measurement System.
Issue: 2
Start Page: 025008