Proceedings of nanoGe International Conference on Perovskite Solar Cells, Photonics and Optoelectronics (NIPHO19)
DOI: https://doi.org/10.29363/nanoge.nipho.2019.052
Publication date: 21st November 2018
Perovskite solar cells exhibited certified power conversion efficiency (PCE) which already approached 22%, but to be considered for large-scale commercial applications these cells have to be stable under operating conditions including exposure to sunlight, heat and electric bias. Here we present stability studies using concentrated sunlight, which allows rapid screening of the degradation parameters in the cells. Specifically, accelerated degradation studies to determine factors affecting degradation at different bias conditions were performed.
Our experimental methodology allows independent control of sunlight intensity, the sample temperature, and environment during the exposure. Experiments revealed that IR filtering can reduce degradation by reducing the temperature. Stress testing of perovskite solar cells showed that faster degradation was found for cells held at SC under concentrated sunlight and on the initial stage of outdoor exposure. However, cells kept at short circuit (SC) showed better long-term stability compared to cells kept at open circuit (OC) upon real operational conditions. We also found that intensity was more important than the dose for cells degradation at SC conditions, while dose was the determining factor at OC. This indicates that different degradation mechanisms are dominant at different degradation stages and under different bias conditions and that nano-scale understanding of degradation mechanisms is required to suggest ways to increase the device life-time.
We thank Prof. D. Feuerman and Prof. J. Gordon for use of their solar concentration lab, Mr. V. Melinchak for technical assistance. AKM is grateful to the Albert Katz International School for partial PhD fellowship. This work was supported by the European Commission’s StableNextSol COST Action MP1307 and by Israel's Ministry of National Infrastructures, Water and Energy Resources (grant no. 0399202/215-11-037).
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