Fully functional semi-transparent perovskite solar cell fabricated in ambient air

Organic-inorganic halide perovskite consider today as one of the most promising materials in terms of energy conversion. The relatively easy fabrication process along with tuneable energy gap and high absorption coefficient enables perovskite-based solar cells to achieve over 23% efficiency. One attractive application is semi-transparent solar cells that can serve as integrated windows in buildings, providing both shadow and electricity. In this work, we present a controlled fabrication method for semi-transparent devices by mesh assisted deposition process. We performed a sequential deposition under ambient air, where in the first step PbI2 grid pattern is formed follow by conversion to MAPbI3 by dipping in MAI solution. The grid cells photo-anode were compose from TiO2 together with Al2O3 nanoparticles and the overall transmittance controlled by PbI2 concentration and the mesh openings size. Semi-transparent devices with Au contact demonstrate power conversion efficiency of 8% while devices with semi-transparent contact composed from MoO3/Au/MoO3 multi-layer yielded 5.5% efficiency with 26% transmittance.