Dynamics of Photoinduced Degradation of Perovskite Photovoltaics: From Reversible to Irreversible Processes

Mark V. Khenkin, K. M. Anoop, Iris Visoly-Fisher, Sofiya Kolusheva, Yulia Galagan, Francesco Di Giacomo, Olivera Vukovic, Bhushan Ramesh Patil, Golnaz Sherafatipour, Vida Turkovic, Horst Günter Rubahn, Morten Madsen, Alexander V. Mazanik, Eugene A. Katz

Research output: Contribution to journalArticlepeer-review

65 Scopus citations

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.

Original languageEnglish
Pages (from-to)799-806
Number of pages8
JournalACS Applied Energy Materials
Volume1
Issue number2
DOIs
StatePublished - 26 Feb 2018

Keywords

  • light soaking
  • perovskite solar cells
  • recovery dynamics
  • reversible and irreversible degradation
  • stability

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering

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