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

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 degrees 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.

Automated summary

The photoelectric conversion efficiency of lead-based halide perovskite photovoltaic cells has reached commercial level in recent years. In this study, an acrylate hot melt adhesive with good transparency and cohesiveness was successfully prepared and applied for encapsulating sandwich perovskite photovoltaic cells. The encapsulated devices showed good stability and leak blocking capability, making them suitable for building-integrated photovoltaics.