Highly efficient UV-blocking and antireflective Polydimethylsiloxane(PDMS) film for Improving the Stability of Photovoltaics
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The high-power conversion efficiency (PCE) and durability against UV degradation of organometal halide perovskite solar cells (PSCs) are challenging factors for commercialization. We report a facile strategy to prevent UV degradation and improve the photoconversion efficiency of PSCs. The textured PDMS film fabricated as a bilayer using a UV absorber reduces the refractive index gradient to increase the transmittance and improve the UV stability of the MAPbI3 layer. In addition, we fabricated a multifunctional film that obtained antireflection and self-cleaning effects by surface texturing. The encapsulated perovskite solar cell maintained over 95 % for 240 hours (at 55% relative humidity) and maintained more than 86% of its initial efficiency even with additional UV irradiation (240 hours), indicating excellent stability. It is a simple and effective approach to improve both the stability of photovoltaics against UV degradation and the PCE and is a novel method for the commercialization of photovoltaics.