Wavelength sensor, also known as color sensor, is widely used in biomimetic eye, safety monitoring and spectrometer applications due to its excellent performance in wavelength discrimination. Recently, Luo Linbao and Liang Fengxia of Hefei University of Technology developed a wavelength sensor with simple structure by depositing two back-to-back Au/MAPbI3/Au photodetectors on MAPbI3 single crystal.
The sensor can quantitatively distinguish the wavelength, and further device analysis shows that it has completely different photoelectric characteristics as a photoelectric detector. Therefore, the developed wavelength sensor can accurately distinguish the incident light wavelength in the range of 265 to 860 nm with a resolution of less than 1.5 nm based on the relationship between the photoelectric current ratio of the two photodetectors and the incident light wavelength. High resolution and wide detection range are important parameters for performance evaluation of such sensors, and they can also achieve panchromatic imaging.
In addition, computer aided design (TCAD) simulation shows that the mechanism of wavelength differentiation is attributed to the wavelength-dependent photon generation rate in MAPbI3 single crystal. The high-performance MAPbI3 wavelength sensor can promote the research progress of perovskite in wavelength recognition and panchromatic imaging.
Fu Can et.al A Simple-Structured Perovskite Wavelength Sensor for Full-Color Imaging Application Nano Letters 2023 DOI: 10.1021/acs.nanolett.2c03932 https://pubs.acs.org/doi/full/10.1021/acs.nanolett.2c03932