Solution-Processed Ultrahigh Detectivity Photodetectors by Hybrid Perovskite Incorporated with Heterovalent Neodymium...

Hybrid perovskite materials have drawn a remarkable attention for approaching high-performance photovoltaics owing to their superior optoelectronic properties. But most of research studies focused on the pristine hybrid perovskite CH₃NH₃PbI₃. In this study, we utilize a newly developed CH₃NH₃PbI₃:xNd³⁺ (x = 0.5 mol %) thin film, where Pb²⁺ is partially substituted by a heterovalent Nd³⁺ cation, as the photoactive layer for solution-processed perovskite photodetectors. It is found that the resultant CH₃NH₃PbI₃:xNd³⁺ (x = 0.5 mol %) thin film possesses superior thin film morphology, enhanced and balanced charge carrier mobilities, and suppressed trap density, resulting in enhanced photocurrent and reduced dark current for perovskite photodetectors by the CH₃NH₃PbI₃:xNd³⁺ (x = 0.5 mol %) thin film. Thus, operated at room temperature, solution-processed perovskite photodetectors exhibit over 10¹⁴ cm Hz^1/2 W^-1 photodetectivity in a spectrum range from 350 to 800 nm, a linear dynamic range over 100 dB, and fast response time. All these results indicate that high-performance solution-processed perovskite photodetectors can be realized by novel hybrid perovskite materials, where Pb²⁺ is partially substituted by heterovalent Nd³⁺ cations.