Regular Article

Terahertz detector based on multi-layer graphene nanoribbons

School of Instrument Science and Optoelectronic Engineering, Beihang University, Beijing 100191, P.R. China

^a e-mail: niuyx@buaa.edu.cn

Received: 27 November 2016
Revised: 26 March 2017
Accepted: 24 April 2017
Published online: 30 May 2017

Abstract

A device model for multi-layer graphene nanoribbons terahertz detector is presented. To investigate the device characteristics, we analyze the source-drain current as a function of incident energy and derive the analytical formulas for detector responsivity. In addition, the dependences of detector responsivity on the back gate voltage as well as on the substrate thickness, temperature and energy gap are discussed. It is shown that the detector characteristics can be effectively modulated by these parameters. Compared with single layer graphene nanoribbons, multiple nanoribbons layers can greatly enhance the source-drain current, achieving higher detector responsivity and sensitivity.