Perovskites have recently emerged as a most promising material for low-cost production of highly efficient solar cells. In particular, the so-called organic-inorganic metal halide perovskites are among the most exciting recent discoveries in the field of photovoltaics in. In less than five years, researchers have succeeded in increasing the energy-converting efficiency of perovskite-based solar cells from 4 to more than 20%. Indeed, in this respect, these relative newcomers have already overtaken many alternative photovoltaic materials, such as purely organic ones. Furthermore, perovskites are not only capable of absorbing light and converting it into electricity, they also display outstanding properties as light emitters.
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