Monolithic Perovskite–Silicon Dual‐Band Photodetector for Efficient Spectral Light Discrimination

Abstract

Selective spectral discrimination of visible and near‐infrared light, which accurately distinguishes different light wavelengths, holds considerable promise in various fields, such as automobiles, defense, and environmental monitoring. However, conventional imaging technologies suffer from various issues, including insufficient spatial optimization, low definition, and optical loss. Herein, a groundbreaking advancement is demonstrated in the form of a dual‐band photodiode with distinct near‐infrared‐ and visible‐light discrimination obtained via simple voltage control. The approach involves the monolithic stacking integration of methylammonium lead iodide (MAPbI3) and Si semiconductors, resulting in a p‐Si/n‐phenyl‐C61‐butyric acid methyl ester/i‐MAPbI3/p‐spiro‐MeOTAD (PNIP) device. Remarkably, the PNIP configuration can independently detect the visible and near‐infrared regions without traditional optical filters under a voltage range of 3 to −3 V. In addition, an imaging system for a prototype autonomous vehicle confirms the capability of the device to separate visible and near‐infrared light via an electrical bias and practicality of this mechanism. Therefore, this study pushes the boundaries of image sensor development and sets the stage for fabricating compact and power‐efficient photonic devices with superior performance and diverse functionality.

Preparation of P3HT/PC61BM/ZnO organic-inorganic composite planar heterojunction photodetectors

“…Zinc oxide (ZnO) is a quintessential semiconductor material, distinguished by its wide bandgap of 3.37 eV, a substantial exciton binding energy of 60 meV, and exceptional optical and electrical properties [1][2][3]. Compared with traditional single wave detectors, dual-band photoelectric stand out in imaging technology, environmental monitoring, optical communication, biomedical and other fields because they can detect two band ranges [4][5][6]. Dual-band detectors can also identify targets based on different spectral responses, and the dual-band information obtained can improve photoelectric detection capabilities [7][8].…”