Recent Progress on Wavelength-Selective Perovskite Photodetectors for Image Sensing

Spectral sensing plays a crucial part in imaging technologies, optical communication, and other fields. However, complicated optical elements, such as prisms, interferometric filters, and diffraction grating, are required for commercial multispectral detectors, which hampers their advance toward miniaturization and integration. In recent years, metal halide perovskites have been emerging for optical-component-free wavelength-selective photodetectors (PDs) because of their continuously tunable bandgap, fascinating optoelectronic properties, and simple preparation processes. In this review, recent advances in wavelength-selective perovskite PDs, including narrowband PDs, dual-band PDs, multispectral-recognizable PDs, and X-ray PDs, are highlighted, with an emphasis on device structure designs, working mechanisms, and optoelectronic performances. Meanwhile, the applications of wavelength-selective PDs in image sensing for single-/dual-color imaging, full-color imaging, and X-ray imaging are introduced. Finally, the remaining challenges and perspectives in this emerging field are presented.

Automated summary

Spectral sensing is crucial in various fields including imaging technologies and optical communication. The miniaturization and integration of commercial multispectral detectors are hindered by the complex optical elements required. Metal halide perovskites have emerged as a promising material for wavelength-selective photodetectors due to their tunable bandgap and simple preparation processes. This review highlights recent advances in wavelength-selective perovskite photodetectors, including narrowband, dual-band, multispectral-recognizable, and X-ray photodetectors, focusing on device structure designs, working mechanisms, and optoelectronic performances. The applications of wavelength-selective photodetectors in image sensing and the remaining challenges and perspectives are also discussed.