Date:

2025-04-30

Title of Paper:

Enhancing Sensitivity of a Single ZnO Micro-/Nanowire Photodetector by Piezo-phototronic Effect

Journal:

ACS Nano

Summary:

We demonstrate the piezoelectric effect on the responsivity of a metal
semiconductor
metal ZnO micro-/nanowire photodetector. The responsivity of the photodetector is respectively enhanced by 530%, 190%, 9%, and 15% upon 4.1 pW, 120.0 pW, 4.1 nW, and 180.4 nW UV light illumination onto the wire by introducing a
0.36% compressive strain in the wire, which effectively tuned the Schottky barrier height at the contact by the produced local piezopotential. After a systematic study on the Schottky barrier height change with tuning of the strain and the excitation light intensity, an in-depth understanding is provided about the physical mechanism of the coupling of piezoelectric, optical, and semiconducting properties. Our results show that the piezo-phototronic effect can enhance the detection sensitivity more than 5-fold for pW levels of light detection.

Co-author:

Qing Yang; Xin Guo; Wenhui Wang; Yan Zhang; Sheng Xu; Der Hsien Lien; *ZL Wang

Volume:

4

Page Number:

6285-6291

Translation or Not:

No

Date of Publication:

2010-10-04