Functionalization of halide perovskites for photoelectric and catalytic applications
【摘要】：Organic–inorganic hybrid perovskites are particularly suited as light-harvesting materials in photovoltaic devices. However, one of the major hindrances for application of these materials in real-world devices is the performance degradation in humid conditions, leading to a rapid loss of photo-electrical response. Here, we demonstrate that hydrophobic tertiary and quaternary alkyl ammonium cations can be successfully assembled on the perovskite surface as efficient water-resisting layers via a facile surface functionalization technique. Such layers can protect the perovskite film under high relative humidity(90 ± 5%) over 30 days. Solar cell devices based on such films can retain the photovoltaic capacities of bulk perovskites. More importantly, we have tested the performance of functionalized perovskite devices for photoelectrochemical water splitting, which is stable for over 30 min in aqueous solution. Improving the humidity tolerance of perovskite materials is a necessary step towards large-scale production of high-performance perovskite-based devices and a broad range of possible applications.