Fabrication of Efficient Perovskite Solar Cells in Ambient Air Using a Humidity-Insensitive Method

Abstract

Fabrication of perovskite solar cells (PSCs) in ambient air is of challenge due to its sensitivity to humidity. In this presentation, we report the fabrication of efficient CH3NH3PbI3 (MAPbI3) PSCs using an antisolvent method which yields decent device performance in a wide range of humidity levels (~ 0% RH, 20% RH, 40% RH, 50% RH and 60% RH). The MAPbI3 films obtained in those conditions are studied by characterizations including scanning electron microscope (SEM), X-ray diffraction (XRD), UV-vis absorption and steady-state photoluminescence (PL). Results exhibit that the quality of the MAPbI3 films shows no obvious difference as a whole. The greatly suppressed influence of humidity is ascribed to the rapid crystallization process due to the antisolvent method. The photovoltaic performances for the devices prepared at these relative humidity (RH) levels are found similar with average power conversion efficiencies (PCE) are around 15%. The storage stability is found similar as well. What’s more, the effect of water absorbed in the hydrophilic precursor to MAPbI3 films and associated solar cells is investigated and found ignorable. As a result, it is concluded that antisolvent method is an ideal humidity-insensitive route to fabricate efficient PSCs in ambient air and may pave the way for massive and low-cost manufacturing of solar panels. Keywords: (perovskite solar cells, CH3NH3PbI3, anti-solvent method, crystallization process)