Degradation Kinetics of Inverted Perovskite Solar Cells

Montisci A.;
2018-01-01

Abstract

We explore the degradation behaviour under continuous illumination and direct oxygen exposure of inverted unencapsulated formamidinium(FA)0.83Cs0.17Pb(I0.8Br0.2)3, CH3NH3PbI3, and CH3NH3PbI3-xClx perovskite solar cells. We continuously test the devices in-situ and in-operando with current-voltage sweeps, transient photocurrent, and transient photovoltage measurements, and find that degradation in the CH3NH3PbI3-xClx solar cells due to oxygen exposure occurs over shorter timescales than FA0.83Cs0.17Pb(I0.8Br0.2)3 mixed-cation devices. We attribute these oxygen-induced losses in the power conversion efficiencies to the formation of electron traps within the perovskite photoactive layer. Our results highlight that the formamidinium-caesium mixed-cation perovskites are much less sensitive to oxygen-induced degradation than the methylammonium-based perovskite cells, and that further improvements in perovskite solar cell stability should focus on the mitigation of trap generation during ageing.
2018
Inglese
8
1
6
6
https://www.nature.com/articles/s41598-018-24436-6.pdf
Esperti anonimi
internazionale
scientifica
Perovskite solar cells; Degradation; In-operando tests; Power conversion efficiency
Article number: 5977
Alsari, M.; Pearson, A. J.; Wang, J. T. -W.; Wang, Z.; Montisci, A.; Greenham, N. C.; Snaith, H. J.; Lilliu, S.; Friend, R. H.
1.1 Articolo in rivista
info:eu-repo/semantics/article
1 Contributo su Rivista::1.1 Articolo in rivista
262
9
open
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