A Simple-Structured Perovskite Wavelength Sensor for Full-Color Imaging Application

Authors：Fu, Can; Li, Zhi-Yuan; Wang, Jiang; Zhang, Xiang; Liang, Feng-Xia^*; Lin, Di-Hua; Shi, Xiao-Feng; Fang, Qun-Ling; Luo, Lin-Bao^*

Source：Nano Letters, 2023, 23(2): 533-540.

DOI：10.1021/acs.nanolett.2c03932

• Wavelength sensor
• Perovskite single crystal
• Back-to-back photodetector
• Distribution of photocurrent rate
• Full-color imaging

In this study, simple-structured wavelength sensors were developed by depositing two back-to-back Au/MAPbI3/Au photodetectors on an MAPbI3 single crystal. This sensor could quantitatively distinguish wavelengths. Further device analysis showed that both photodetectors possess entirely disparate optoelectronic properties. Consequently, the as-developed wavelength sensor could accurately distinguish incident-light wavelengths ranging from 265 to 860 nm with a resolution of less than 1.5 nm based on the relation between the photocurrent ratios of both photodetectors and the incident light wavelengths. Notably, a high resolution and wide detection range are among the optimum reported values for such sensors and enable full-color imaging. Furthermore, technology computer-aided design (TCAD) simulations showed that a mechanism involved in distinguishing wavelengths is attributed to the wavelength-dependent photon generation rate in MAPbI3 single crystals. The high-performance MAPbI3 wavelength sensor can potentially drive the research progress of perovskites in wavelength recognition and full-color imaging.