Microscopic insight into the reversibility of photodegradation in MAPbI3 thin films

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Microscopic insight into the reversibility of photodegradation in MAPbI3 thin films. / Merdasa, Aboma; Tsarev, Sergey; Akbulatov, Azat F.; Troshin, Pavel; Unger, Eva L.

I: Journal of Luminescence, Vol. 219, 116916, 2020.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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T1 - Microscopic insight into the reversibility of photodegradation in MAPbI3 thin films

AU - Merdasa, Aboma

AU - Tsarev, Sergey

AU - Akbulatov, Azat F.

AU - Troshin, Pavel

AU - Unger, Eva L.

PY - 2020

Y1 - 2020

N2 - 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.

AB - 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.

U2 - 10.1016/j.jlumin.2019.116916

DO - 10.1016/j.jlumin.2019.116916

M3 - Article

VL - 219

JO - Journal of Luminescence

JF - Journal of Luminescence

SN - 0022-2313

M1 - 116916

ER -