Title
Dynamics of Photoinduced Degradation of Perovskite Photovoltaics: From Reversible to Irreversible Processes
Author
Khenkin, M.V.
Anoop, K.M.
Visoly-Fisher, I.
Kolusheva, S.
Galagan, Y.
Di Giacomo, F.
Vukovic, O.
Patil, B.R.
Sherafatipour, G.
Turkovic, V.
Rubahn, H.G.
Madsen, M.
Mazanik, A.V.
Katz, E.A.
Publication year
2018
Abstract
The operational stability of perovskite solar cells (PSCs) remains a limiting factor in their commercial implementation. We studied the long-term outdoor stability of ITO/SnO2/Cs0.05((CH3NH3)0.15(CH-(NH2)2)0.85)0.95PbI2.55Br0.45/spiro-OMeTAD/Au cells, as well as the dynamics of their degradation, under simulated sunlight indoors and their recovery in the dark. The extent of overall degradation was found to depend on processes occurring both under illumination and in the dark, i.e., during the daytime and nighttime, with the dynamics varying with cell aging. Full recovery of efficiency in the dark was observed for cells at early degradation stages. Further cell degradation resulted in recovery times much longer than one night, appearing as irreversible degradation under real operational conditions. At later degradation stages, very different dynamics were observed: short-circuit current density and fill factor exhibited a pronounced drop upon light turn-off but strong improvement under subsequent illumination. The interplay of reversible and irreversible degradation processes with different recovery dynamics was demonstrated to result in changes in the cell’s diurnal PCE dependence during its operational lifespan under real sunlight conditions.
Subject
Chemistry
Industrial Innovation
Perovskite solar cells
Stability
Reversible degradation
Irreversible degradation
Light soaking
Recovery dynamics
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http://resolver.tudelft.nl/uuid:afd3d7fc-20e8-4b86-b925-7abc0e21c7c9
DOI
https://doi.org/10.1021/acsaem.7b00256
TNO identifier
788608
Source
ACS Applied Energy Materials, 3
Document type
article