Layered Perovskites Enhanced Perovskite Photodiodes.

Recently, two-dimensional layered perovskites have emerged as effective additives for stabilizing conventional three-dimensional metal halide perovskites. With the addition of layered perovskites, the perovskite-based devices also exhibited enhanced optoelectronic properties, such as reduced nonradiative recombination and ionic migration, strengthened crystallinity, and anisotropic charge transport. However, the influence of the large organic cations on the performance metrics of the photodiodes is not fully understood. In this work, we systematically investigate the device performance and related optoelectronic features of the layered perovskite-enhanced perovskite photodiodes. In particular, with the addition of large organic cations to the FACsPbI perovskite matrix, the devices exhibited reduced dark current and noise, increased detectivity of >10 Jones, and a consistent high speed of <100 ns. More importantly, the layered perovskite-enhanced photodiodes exhibited less hysteresis and higher breakdown voltages.