CUED Publications database

A self-powered high-performance graphene/silicon ultraviolet photodetector with ultra-shallow junction: breaking the limit of silicon?

Wan, X and Xu, Y and Guo, H and Shehzad, K and Ali, A and Liu, Y and Yang, J and Dai, D and Lin, C-T and Liu, L and Cheng, H-C and Wang, F and Wang, X and Lu, H and Hu, W and Pi, X and Dan, Y and Luo, J and Hasan, T and Duan, X and Li, X and Xu, J and Yang, D and Ren, T and Yu, B A self-powered high-performance graphene/silicon ultraviolet photodetector with ultra-shallow junction: breaking the limit of silicon? npj 2D Materials and Applications, 1. (Unpublished)

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Abstract

We present a self-powered, high-performance graphene-enhanced ultraviolet silicon Schottky photodetector. Different from traditional transparent electrodes, such as indium tin oxides or ultra-thin metals, the unique ultraviolet absorption property of graphene leads to long carrier life time of hot electrons that can contribute to the photocurrent or potential carrier-multiplication. Our proposed structure boosts the internal quantum efficiency over 100%, approaching the upper-limit of silicon-based ultraviolet photodetector. In the near-ultraviolet and mid-ultraviolet spectral region, the proposed ultraviolet photodetector exhibits high performance at zero-biasing (self-powered) mode, including high photo-responsivity (0.2 A W$^{-1}$), fast time response (5 ns), high specific detectivity (1.6 × 10$^{13}$ Jones), and internal quantum efficiency greater than 100%. Further, the photo-responsivity is larger than 0.14 A W$^{-1}$ in wavelength range from 200 to 400 nm, comparable to that of state-of-the-art Si, GaN, SiC Schottky photodetectors. The photodetectors exhibit stable operations in the ambient condition even 2 years after fabrication, showing great potential in practical applications, such as wearable devices, communication, and “dissipation-less” remote sensor networks.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:07
Last Modified: 12 Oct 2017 01:47
DOI: