Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO24)
Publication date: 25th April 2024
Recent breakthroughs have pushed the conversion efficiencies of organometallic lead halide thin films to 25.7% in a remarkably short timeframe. Semi-transparent perovskite solar cells show excellent potential in terms of both average visible transmittance and color neutrality, making them ideal for Building Integrated Photovoltaics. Mixed bromide-chloride perovskites allow the optical bandgap (2.3-3.0 eV) to be tuned by changing the chloride percentage, thus defining a new state-of-the-art for semi-transparent modules.[1,2]
In this work, we present the excited-state properties of a thin film of FAPb(Br1-xClx)3 perovskite with different chlorine percentages (0%<x<25%) studied by combining steady-state and time-resolved spectroscopies with theoretical analyses. Our investigation elucidates how the chemical composition induces specific modifications in the electronic bands and recombination rates of these materials.[3]
Here, we present the excited-state properties of thin film of mixed bromide-chloride perovskites studied combining steady-state light absorption, photoluminescence (PL), femtosecond transient absorption spectroscopy (FTAS), photoelectron spectroscopy (PES) with density functional theory (DFT) calculations. In this way, we give a complete description of the electronic properties of the materials, assigning the electronic bands involved in the photoexcitation by UV-Vis radiation and the relative carrier dynamics. By gathering all this information together, the performance of the different materials within a solar cell device was accurately predicted and compared with electronic characterization of working devices. In particular, we have correlated crucial figures of merit, such as PCE and LUE, with the optoelectronic properties, such as electronic band structure and carrier recombination rates.
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