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γ‑Ray-Induced Degradation in the Triple-Cation Perovskite Solar Cells
journal contribution
posted on 2019-01-08, 00:00 authored by Aleksandra
G. Boldyreva, Azat F. Akbulatov, Sergey A. Tsarev, Sergey Yu. Luchkin, Ivan S. Zhidkov, Erst Z. Kurmaev, Keith J. Stevenson, Vladimir G. Petrov, Pavel A. TroshinWe
report on the impact of γ radiation (0–500 Gy)
on triple-cation Cs0.15MA0.10FA0.75Pb(Br0.17I0.83)3 perovskite solar
cells. A set of experiments was designed to reveal the individual
contributions of the hole-collecting bottom electrode, perovskite
absorber, and electron transport layer (ETL) to the overall solar
cell degradation under radiation exposure. We show that the glass/ITO/PEDOT:PSS
hole-collecting electrode withstands a 500 Gy dose without any losses
in the solar cell performance. In contrast, the perovskite absorber
films and PC61BM ETL are very sensitive to γ rays,
as can be concluded from the radiation-induced decay of the solar
cell efficiency by ∼32–41%. Red shift of the perovskite
emission bands and strong enhancement of the photoluminescence suggest
that γ rays induce phase segregation of iodine-rich and bromine-rich
domains, which represents the first reported example of the radiation-induced
halide phase separation in perovskite films. The degradation pathway
revealed here emphasizes the need for developing a new generation
of metal halide absorbers and ETL materials with improved radiation
stability to enable potential space applications of perovskite photovoltaics.
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solar cell performancesolar cell efficiencypb ( brmetal halide absorbersfirst reported exampleelectron transport layercollecting electrode withstandscollecting bottom electrode75 sub61 sub3 sub17 sub15 sub10 subperovskite solar cellsperovskite emission bandsdegradation pathway revealedγ ‑ rayimproved radiation stabilityperovskite absorber filmsperovskite filmsperovskite absorberperovskite photovoltaicsinduced degradationγ raysγ radiationstrong enhancementred shiftradiation exposurephotoluminescence suggestnew generationinduced decayindividual contributionscation cs
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