Publication date: 15th December 2025
Thin films of lead halide perovskites find applications in photovoltaics, photodetection, and other areas of optoelectronics. One interesting research direction focuses on photoluminescent films that exhibit energy transfer and exotic optical phenomena such as amplified spontaneous emission, lasing, and superfluorescence. Regarding these photoluminescence phenomena, thin-film compositions of methylammonium lead iodide (MAPI) and mixed-dimensional 2D–3D phenethylammonium cesium lead bromide (PEA:Cs)PbBr3 have emerged as popular systems for studying radiative photophysics as a function of composition, phase purity, temperature, and excitation conditions. Given the dynamic nature of lead halide perovskite structure and energy flow, correlating spectroscopic observables with structural changes on similar time scales is of fundamental interest both for understanding mechanisms and for identifying ways to engineer these materials for optimal performance. In this talk, I will discuss our efforts to correlate time-resolved optical spectroscopy with time-resolved diffraction of MAPI and (PEA:Cs)PbBr3 thin films, in order to gain insight into mechanisms governing photoluminescence, energy transfer, and potentially superfluorescence at cryogenic temperatures and under high excitation conditions.
The work of D.B. was funded by the European Union (ERC StartingGrant PROMETHEUS, project no. 101039683). We acknowledge the MAX IV Laboratory for beamtime on the FemtoMAX beamline under proposal 20241468. Research conducted at MAX IV, a Swedish national user facility, is supported by Vetenskapsrådet (Swedish Research Council, VR) under contract 2018-07152, Vinnova (Swedish Governmental Agency for Innovation Systems) under contract 2018-04969 and Formas under contract 2019-02496.
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