Breaking the 25% Transparency and 15% Efficiency limits of Perovskite Solar Cells in a broad angular range of sun-light incidence

Abstract

Realizing semi-transparent perovskite solar cells for building applications is a very hard goal not only because the absorption and the transmission of light through the device are two competitive processes, but also because the Power Conversion Efficiency (PCE) decreases with the angle of incidence of sunlight rays due to the increased reflection intensity. Moreover, an Average Visible Transmittance (AVT) of 25% and PCE of 15% have to be overcome simultaneously in a wide angular range in order to penetrate the market of smart windows. Here, through a rational management of the p and s light reflection modes of a dielectric/metal/dielectric used as top-electrode, we realize a semi-transparent FAPbI3 perovskite solar cell with an AVT value of 28% without the detriment of the PCE, that remains over 15% in a broad angular range up to 50° from normal light-incidence, thus breaking the benchmarks for a real building integration.