A high-performance photodetector based on a ZnO/CsPbBr3 quantum-dot-level-contact hybrid sandwich structure

Abstract

Perovskite quantum dot photodetectors have attracted significant attention due to their splendid electronic and optical properties. However, the nonradiative recombination in CsPbBr₃ quantum dot (QD) thin films is very severe, which limits their performance. To solve this problem, a ZnO/CsPbBr₃ quantum-dot-level-contact hybrid sandwich structure is designed, which enlarges the contact area between the ZnO quantum dot (QD) electron transport layer (ETL) and CsPbBr₃ QD absorption layer, promoting the charge separation efficiency and improving the photoelectric conversion efficiency. The photodetector based on the ZnO/CsPbBr₃ quantum-dot-level-contact hybrid sandwich structure exhibits a high on/off ratio of 1.52 × 10³, an enhanced responsivity of 79.5 mA W⁻¹, and a superior specific detectivity of 3.97 × 10¹¹ Jones. The quantum-dot-level-contact designed strategy for this photodetector may blaze a trail for high-efficiency optoelectronic devices.