DOI: https://doi.org/10.29363/nanoge.sus-mhp.2022.018
Publication date: 15th November 2022
Metal halide perovskite solar cells have achieved record efficiencies of over 25%, comparable to mainstream silicon solar cells. However, the processing method and operational stability need further development to bring this technology to commercialization. In this context, we use a flash-infrared annealing method, which is environmentally friendly and rapid processing, without the use of toxic chlorobenzene, to process highly stable perovskite solar cells. Therefore, this work reveals the phase stabilization mechanism for perovskite halide films through thermodynamic, structural, and photophysical analysis related to process parameters optimization.[1] Measuring the enthalpy changes of the FAPbI3 composition at different heating rates allows us to calculate an activation energy of 1.8 eV for the black perovskite phase transition. We explore different heating regimes for triggering the phase transformation and analyze the evolution of the microstructure with an empirical calculation of the average crystal growth velocity required to form a compact film on the micron and submicron scales. A key interplay between perovskite halide thin-film crystallization phenomena and manufacturing aspects will be addressed.[2]
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