How Important Is the Organic Part of Lead Halide Perovskite
Photovoltaic Cells? Efficient CsPbBr<sub>3</sub> Cells
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Abstract
Hybrid organic–inorganic lead
halide perovskite photovoltaic
cells have already surpassed 20% conversion efficiency in the few
years that they have been seriously studied. However, many fundamental
questions still remain unanswered as to why they are so good. One
of these is “Is the organic cation really necessary to obtain
high quality cells?” In this study, we show that an all-inorganic
version of the lead bromide perovskite material works equally well
as the organic one, in particular generating the high open circuit
voltages that are an important feature of these cells