Affiliation:
1. Information Materials and Intelligent Sensing Laboratory of Anhui Province Anhui University No. 111 Jiulong Road Hefei Anhui Province 230601 China
2. Hefei Comprehensive National Science Center Hefei Anhui 230601 China
3. Huadong Photo‐Electron IC Institute Bengbu 233000 China
4. Key Lab of Artificial Micro‐ and Nano‐structures of Ministry of Education of China School of Physics and Technology Wuhan University Wuhan Hubei 430072 China
Abstract
AbstractPerovskite single crystals (SCs) have gained significant interest in various applications owing to their superior optoelectrical and physical characteristics as compared to polycrystalline films. However, a considerable portion of incident light is typically reflected at the surface of perovskite SCs, leading to insufficient light absorption within the crystal bulk, ultimately resulting in reduced performance of SC‐based photodetectors. In the present work, an inverted pyramid‐shaped structure is in situ introduced on the surface of an MAPbBr3 SC during the crystal growth process, which can reduce light reflection in the surface region and enhance light absorption of the SC. Additionally, the hydrophobic small molecule copper (II) phthalocyanine (CuPc) is thermally evaporated onto the SC, forming a CuPc/MAPbBr3 heterojunction for the first time. The CuPc/pyramid‐shaped MAPbBr3 heterojunction‐based photodetector exhibits self‐powered characteristics and superior optoelectrical performance, achieving a photocurrent of greater than 10−5 A (10−7 A), a responsiveness of 257 mA W−1 (8.84 mA W−1), and a detection rate of 2.98 × 1012 Jones (1.02 × 1011 Jones) at −2 V (0 V) bias. Simultaneously, the device demonstrates excellent long‐term stability under high humidity conditions, retaining 90.5% of its initial photocurrent even after 60 days in a 60–80% humidity environment.
Funder
Natural Science Foundation of Anhui Province
National Natural Science Foundation of China
China Postdoctoral Science Foundation
Subject
Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials