Heterojunctions of Mercury Selenide Quantum Dots and Halide Perovskites with High Lattice Matching and Their Photodetection Properties

Author:

Yu Chengye1,Shan Yufeng2,Zhu Jiaqi2,Sun Dingyue1,Zheng Xiaohong1,Zhang Na1,Hou Jingshan1,Fang Yongzheng1,Dai Ning23,Liu Yufeng13

Affiliation:

1. School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China

2. Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China

3. State Key Labratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China

Abstract

Heterojunction semiconductors have been extensively applied in various optoelectronic devices due to their unique carrier transport characteristics. However, it is still a challenge to construct heterojunctions based on colloidal quantum dots (CQDs) due to stress and lattice mismatch. Herein, HgSe/CsPbBrxI3−x heterojunctions with type I band alignment are acquired that are derived from minor lattice mismatch (~1.5%) via tuning the ratio of Br and I in halide perovskite. Meanwhile, HgSe CQDs with oleylamine ligands can been exchanged with a halide perovskite precursor, acquiring a smooth and compact quantum dot film. The photoconductive detector based on HgSe/CsPbBrxI3−x heterojunction presents a distinct photoelectric response under an incident light of 630 nm. The work provides a promising strategy to construct CQD-based heterojunctions, simultaneously achieving inorganic ligand exchange, which paves the way to obtain high-performance photodetectors based on CQD heterojunction films.

Funder

National Natural Science Foundation of China

State Key Laboratory of Infrared Physics

Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Yunnan Fundamental Research Projects

Hangzhou Science and Technology Bureau of Zhejiang Province

Publisher

MDPI AG

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