Spatially inhomogeneous photoluminescence-voltage hysteresis in planar heterojunction perovskite-based solar cells

Zhihua Xu; Anthony Edgeton; Sydney Costello

doi:10.1063/1.5001326

Spatially inhomogeneous photoluminescence-voltage hysteresis in planar heterojunction perovskite-based solar cells

Zhihua Xu, Anthony Edgeton, Sydney Costello

Chemical Engineering

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Abstract

Spatially resolved photoluminescence (PL) of methylammonium lead iodide (MAPbI₃) films in planar heterojunction solar cells is probed by time-resolved confocal microscopy to study the interface effect on PL intensity-voltage (PL-V) hysteresis. Negligible PL-V hysteresis is observed at the interfacial area, while significant hysteresis is observed in the bulk film. PL lifetime imaging of the perovskite device reveals inhomogeneous charge extraction due to variation of the interfacial contact quality. Poor interfacial contact leads to more severe PL-V hysteresis in the bulk perovskite film. The PL-V characteristics also suggest that voltage-driven ion migration may lead to redistribution of charge traps, and consequently affect the nonradiative charge recombination and the PL intensity in MAPbI₃ films.

Original language	English (US)
Article number	223901
Journal	Applied Physics Letters
Volume	111
Issue number	22
DOIs	https://doi.org/10.1063/1.5001326
State	Published - Nov 27 2017

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© 2017 Author(s).

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title = "Spatially inhomogeneous photoluminescence-voltage hysteresis in planar heterojunction perovskite-based solar cells",

abstract = "Spatially resolved photoluminescence (PL) of methylammonium lead iodide (MAPbI3) films in planar heterojunction solar cells is probed by time-resolved confocal microscopy to study the interface effect on PL intensity-voltage (PL-V) hysteresis. Negligible PL-V hysteresis is observed at the interfacial area, while significant hysteresis is observed in the bulk film. PL lifetime imaging of the perovskite device reveals inhomogeneous charge extraction due to variation of the interfacial contact quality. Poor interfacial contact leads to more severe PL-V hysteresis in the bulk perovskite film. The PL-V characteristics also suggest that voltage-driven ion migration may lead to redistribution of charge traps, and consequently affect the nonradiative charge recombination and the PL intensity in MAPbI3 films.",

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AU - Edgeton, Anthony

AU - Costello, Sydney

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AB - Spatially resolved photoluminescence (PL) of methylammonium lead iodide (MAPbI3) films in planar heterojunction solar cells is probed by time-resolved confocal microscopy to study the interface effect on PL intensity-voltage (PL-V) hysteresis. Negligible PL-V hysteresis is observed at the interfacial area, while significant hysteresis is observed in the bulk film. PL lifetime imaging of the perovskite device reveals inhomogeneous charge extraction due to variation of the interfacial contact quality. Poor interfacial contact leads to more severe PL-V hysteresis in the bulk perovskite film. The PL-V characteristics also suggest that voltage-driven ion migration may lead to redistribution of charge traps, and consequently affect the nonradiative charge recombination and the PL intensity in MAPbI3 films.

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Spatially inhomogeneous photoluminescence-voltage hysteresis in planar heterojunction perovskite-based solar cells

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