Enhanced Visible-Light Photodetection with Undoped and Doped ZnO Thin-Film Self-Powered Photodetectors

Manohar Singh; Anit Kumar Ambedkar; Shrestha Tyagi; Ashwani Kumar; Arun Kumar; Yogendra K Gautam; Kavita Sharma; Beer Pal Singh

doi:10.1021/acsomega.3c04091

Enhanced Visible-Light Photodetection with Undoped and Doped ZnO Thin-Film Self-Powered Photodetectors

ACS Omega. 2023 Sep 27;8(40):36966-36977. doi: 10.1021/acsomega.3c04091. eCollection 2023 Oct 10.

Authors

Manohar Singh¹, Anit Kumar Ambedkar¹, Shrestha Tyagi¹, Ashwani Kumar^{2

3}, Arun Kumar⁴, Yogendra K Gautam¹, Kavita Sharma¹, Beer Pal Singh¹

Affiliations

¹ Department of Physics, Chaudhary Charan Singh University, Meerut 250004, India.
² Nanoscience Laboratory, Institute Instrumentation Centre, IIT Roorkee, Roorkee 247667, India.
³ Department of Physics, Graphic Era Deemed to be University, Dehradun, Uttarakhand 248002, India.
⁴ Department of Applied Physics, Amity Institute of Applied Science(AIAS), Amity University, Noida, Uttar Pradesh 201303, India.

Abstract

Photodetection plays an essential role in the visible-light zone and is important in modern science and technology owing to its potential applications in various fields. Fabrication of a stable photodetector remains a challenge for researchers. We demonstrated a high-response/recovery and self-powered undoped ZnO (UZO) and Cu-doped ZnO (CZO) thin film-based visible-light photodetector fabricated on a cost-effective Si substrate using reactive cosputtering. The structural, morphological, and optical properties of CZO and UZO thin films have been examined using X-ray diffraction, field emission scanning electron microscopy, X-ray photoelectron spectroscopy, atomic force microscopy, and photoluminescence spectroscopy. The results of the CZO/n-Si photodetector compared with those of the undoped ZnO (UZO)/n-Si photodetector show that the CZO/n-Si exhibits a higher on/off ratio, responsivity, and detectivity than UZO/n-Si. Also, the CZO/n-Si photodetector shows high stability and reproducibility over 20 cycles after 180 days. A relative study of CZO/n-Si- and UZO/n-Si-based photodetectors reveals the enhanced performance of the CZO/n-Si photodetector, which has a high on/off ratio of ∼300 with a high specific detectivity of 2.8 × 10¹⁰ Jones for 75 mW visible light. The prepared self-powered CZO/n-Si/Ag thin film-based visible-light photodetector paves the way for the development of high-performance photodetector designs.