26Abstract Metal halide perovskites have emerged as an extremely efficient material for use as a solar absorber in photovoltaic solar cells. These materials possess many properties unique to this class of semiconductors. For instance, processed from precursor salts, metal halide perovskites form polycrystalline films at low temperatures, with electronically benign defects. Their energetic band gap, which governs their color and band of sun-light absorbed, is extremely easy to tune by simple changes in the material composition. This has enabled the development of wide-band-gap perovskites and “multi-junction” solar cells, which have rapidly surpassed the power conversion efficiency of crystalline Silicon PV.In this talk I will highlight our early discover of remarkably good charge transport, high luminescence efficiency, long range charge carrier diffusion and efficient solid-state planar heterojunction metal-halide perovskite solar cells. The very high open-circuit voltages that we achieved early on, enabled us to realize that perovskites could be ideally suited for multi-junction solar cells, opening the possibility to not just match, but surpass the efficiency of industrialized PV technologies. I will present the journey to multi-junction solar cells, both by combining perovskites with silicon, and as a stand alone thin-film “all-perovskite” multi-junction technology. I will continue to highlight my industrial journey with Oxford PV, who sold the world’s first commercial perovskite-on-silicon tandem modules in 2024, and continue to ramp up this technology, which represents the next transition for main stream PV and other exciting high efficiency applications. Based on the thermodynamics of the interaction of light with matter, there is a common understanding that “a good solar cell should also be a good light emitting diode”. I will finish with a brief illustration of how metal halide perovskites can be used in light emitting applications, as both LEDs and as color converters in micro displays. Metal Halide Perovskite Solar Cells: from Scientific Curiosity to an Henry James SnaithOX13PU, UK.Industrialized TechnologyUniversity of Oxford, Department of Physics, Clarendon Laboratory, Parks Road, Oxford, NIMS Award Winning Lecture 2
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