2D perovskite narrowband photodetector arrays

Abstract

Narrowband photodetectors, which are capable of detecting light within a narrow spectral range, have important applications in the fields of digital cameras, biosensing and artificial vision. In particular, 2D layered perovskites stand out as good candidate materials for narrowband photodetectors due to their prominent properties, such as natural quantum-well structure and tunable bandgap. Although narrowband photodetectors based on 2D perovskites have been presented recently, for some practical applications, including optical communication and imaging, narrowband photodetector arrays need to be prepared, which has not been reported yet. Here, we have demonstrated the fabrication of 12 × 11 narrowband photodetector arrays based on 2D (BA)₂PbI₄ perovskites to realize imaging for the first time. The as-prepared photodetector exhibits a narrow photo-response peak centered at around 546 nm with a full width at half maximum of 24 nm. Besides, it shows a high external quantum efficiency of 350% and a detectivity of 2.17 × 10¹¹ Jones under 546 nm illumination. Furthermore, the narrowband photodetector arrays can also realize imaging under monochromatic light illumination from the back side of the device with wavelength selection.