An effective encapsulation for perovskite solar cells based on building-integrated photovoltaics

Abstract

The photoelectric conversion efficiency of lead-based halide perovskite photovoltaic cells (PSC) has reached 25% in recent years, which is the commercial level. A safe and environment-friendly encapsulation material and process for PSC determines its application in building-integrated photovoltaics. In this work, an acrylate hot melt adhesive (AHMA) with good transparency and extensive cohesiveness was obtained by free-radical copolymerization, based on which, the safety sandwich perovskite photovoltaic cell was prepared together with PVB film at 80 °C. It avoids the structural damage of perovskite devices under high-temperature or UV curing. Before and after packaging, 21.58% and 20.88% of the PCE were achieved, respectively, for the perovskite photovoltaic device, which shows good stability. It has been confirmed that more than 96% of lead leakage can still be blocked from the seriously damaged device after heavy rainfall for 6 hours. The encapsulation scheme introduced here is especially suitable for perovskite photovoltaic building integration.