PuSH - Publikationsserver des Helmholtz Zentrums München: Deriving mobility-lifetime products in halide perovskite films from spectrally and time-resolved photoluminescence.

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Yuan, Y.* ; Yan, G.* ; Akel, S.* ; Rau, U.* ; Kirchartz, T.*

Deriving mobility-lifetime products in halide perovskite films from spectrally and time-resolved photoluminescence.

Sci. Adv. 11, 11 (2025)

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Lead-halide perovskites are semiconductor materials with attractive properties for photovoltaic and other optoelectronic applications. However, determining crucial electronic material parameters, such as charge-carrier mobility and lifetime, is plagued by a wide range of reported values and inconsistencies caused by interpreting and reporting data originating from different measurement techniques. Here, we propose a method for the simultaneous determination of mobility and lifetime using only one technique: transient photoluminescence spectroscopy. By measuring and simulating the decay of the photoluminescence intensity and the redshift of the photoluminescence peak as a function of time after the laser pulse, we extract the mobility, lifetime, and diffusion length of halide perovskite films. With a voltage-dependent steady-state photoluminescence measurement on a cell, we relate the diffusion length to the external voltage and quantify its value at the maximum power point.

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