Photosensitive Dielectric 2D Perovskite Based Photodetector for Dual Wavelength Demultiplexing

• Published in: Advanced materials (Weinheim) Vol. 35; no. 21; pp. e2300632 - n/a
• Main Authors: Qiao, Bao‐Shi, Wang, Su‐Yun, Zhang, Zhi‐Hong, Lian, Zhen‐Dong, Zheng, Zhi‐Yao, Wei, Zhi‐Peng, Li, Lin, Ng, Kar Wei, Wang, Shuang‐Peng, Liu, Zhi‐Bo
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 01-05-2023
• Subjects: 2D material; Data transfer (computers); demultiplexer; Demultiplexing; Dielectric properties; dual‐wavelength; Materials science; Metal halides; Optoelectronics; perovskite; Perovskites; Photoelectric effect; Photometers; Photonic band gaps; Photosensitivity; photovoltaic detector; Two dimensional materials; perovskite; 2D material; dual-wavelength; photovoltaic detector; demultiplexer
• ISSN: 0935-9648; 1521-4095
• DOI: 10.1002/adma.202300632

Stacked 2D perovskites provide more possibilities for next generation photodetector with more new features. Compared with its excellent optoelectronic properties, the good dielectric performance of metal halide perovskite rarely comes into notice. Here, a bifunctional perovskite based photovoltaic detector capable of two wavelength demultiplexing is demonstrated. In the Black Phosphorus/Perovskite/MoS2 structured photodetector, the comprehensive utilization of the photosensitive and dielectric properties of 2D perovskite allows the device to work in different modes. The device shows normal continuous photoresponse under 405 nm, while it shows a transient spike response to visible light with longer wavelengths. The linear dynamic range, rise/decay time, and self‐powered responsivity under 405 nm can reach 100, 38 µs/50 µs, and 17.7 mA W‐1, respectively. It is demonstrated that the transient spike photocurrent with long wavelength exposure is related to the illumination intensity and can coexist with normal photoresponse. Two waveband‐dependent signals can be identified and used to reflect more information simultaneously. This work provides a new strategy for multispectral detection and demultiplexing, which can be used to improve data transfer rates and encrypted communications. This work mode can inspire more multispectral photodetectors with different stacked 2D materials, especially to the optoelectronic application of the wide bandgap, high dielectric photosensitive materials.
By employing the photosensitive dielectric property of 2D perovskite, this work provided a demonstration of a bi‐functional photovoltaic detector. A normal response of 405‐nm light and a spike response of long wavelength coexist in this device. The spike response is a result of the dielectric property of 2D perovskite and can be used for two‐wavelength demultiplexing.