Dual-coupling effect enables a high-performance self-powered UV photodetector

Author:

Lin Xianqi1,Wan Lingyu1ORCID,Chen Zhengbang1,Ren Jinlong1,Lin Shuixiu1,Yuan Dingcheng2,Sun Wenhong1,Peng Biaolin3

Affiliation:

1. Guangxi University

2. China Telecom Co.

3. Xidian University

Abstract

Self-powered ultraviolet photodetectors generally operate by utilizing the built-in electric field within heterojunctions or Schottky junctions. However, the effectiveness of self-powered detection is severely limited by the weak built-in electric field. Hence, advances in modulating the built-in electric field within heterojunctions are crucial for performance breakthroughs. Here, we suggest a method to enhance the built-in electric field by taking advantage of the dual-coupling effect between heterojunction and the self-polarization field of ferroelectrics. Under zero bias, the fabricated AgNWs/TiO2/PZT/GaN device achieves a responsivity of 184.31 mA/W and a specific detectivity of 1.7 × 1013 Jones, with an on/off ratio of 8.2 × 106 and rise/decay times reaching 0.16 ms/0.98 ms, respectively. The outstanding properties are primarily attributed to the substantial self-polarization of PZT induced by the p-GaN and the subsequent enhancement of the built-in electric field of the TiO2/PZT heterojunction. Under UV illumination, the dual coupling of the enhanced heterojunction and the self-polarizing field synergistically boost the photo-generated carrier separation and transport, leading to breakthroughs in ferroelectric-based self-powered photodetectors.

Funder

National Natural Science Foundation of China

Specific Research Project of Guangxi for Research Bases and Talents

Key Technology Research and Development Program of Shandong

Publisher

Optica Publishing Group

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