Carrier relaxation in inorganic perovskites

What is it about?

CsPbBr3 is an extremely interesting material for realization of innovative devices, in particular efficient incoherent and coherent light emitters in the green. Despite the huge amount of research devoted to this material, some fundamental aspects are still not fully understood. In this paper we address the topic of carrier thermalization and we discuss the interplay of free and localized states in ruling the radiative recombination dynamics.

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Why is it important?

We provide a detailed measure of the relaxation in time of the carrier temperature with a clear distinction between the non-thermal and thermal regime. The comparison with a model is provided and gives a quantitative estimate of the characteristic time constant. A long-recovery time from a saturation regime for localized states and a photoinduced superlinear increase of the free exciton population are found, with an overall dynamics occurring in a time scale much longer than what commonly found in semiconductors.