Microscopic insight into the reversibility of photodegradation in MAPbI3 thin films

Aboma Merdasa, Sergey Tsarev, Azat F. Akbulatov, Pavel Troshin, Eva L. Unger

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Whether optoelectronic devices based on metal-halide perovskite semiconductors will become a commercially viable technology will be determined by their intrinsic and operational stability. Recent results indicate there is some reversibility of perovskite degradation in thin films and devices, although mechanistic insight into the processes driving degradation and recovery are still scarce. We here present a comparative spectroscopic study of methylammonium lead iodide (MAPbI3) films having undergone either photo- or thermal degradation under controlled conditions. We confirm that the degradation mechanism pertaining to each type of stress is inherently different. Our results from photoluminescence microscopy measurements paint a spatially, spectrally and temporarily resolved picture showing that, unlike thermally degraded samples, photodegraded samples are in a state that intermittently recovers to luminescent MAPbI3 upon laser excitation. This indicates that rather than irreversibly decomposing, photoinduced degradation leaves MAPbI3 structurally or compositionally intact but induces defects causing non-radiative recombination losses.

Original languageEnglish
Article number116916
JournalJournal of Luminescence
Volume219
DOIs
Publication statusPublished - Mar 2020

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