CsPbIBr₂-Based Bifacial Semitransparent Solar Cells for All-Day Applications

Among all-inorganic perovskites, CsPbIBr2 has become a potential candidate in semitransparent perovskite solar cells (ST-PSCs) due to its excellent thermal stability and suitable bandgap. Herein, by optimizing the ambient temperature in an N-2-filled glovebox, the growth process of CsPbIBr2 crystals is regulated to avoid the generation of pinholes and improve the photoelectric conversion capacity of perovskite cells. When the ambient temperature is around 25 degrees C, the champion power conversion efficiency (PCE) of 10.82% with opaque n-i-p structure is achieved. Based on MoOx/ Ag/MoOx (20/12/20 nm) multilayer top electrode, the ST-PSC device achieves a maximum PCE of 7.06% at the fluorine-doped tin oxide side under the simulated 1 sun illumination condition and a PCE of 23.96% at MoOx/ Ag/MoOx electrode side under the intensity of 1000 lux (similar to 350 mu Wcm(-2)) provided by a white light-emitting diode lamp, along with an average visible transmittance of 29.25%. The resulting perovskite solar cell is the first bifacial inorganic ST-PSC that could be used under both sunlight and indoor light, which is an important step toward all-day power generation of inorganic STPSCs and building-integrated photovoltaics.