Broadband high photoresponse from pure monolayer graphene photodetector

By Yongzhe Zhang, Tao Liu, Bo Meng, Xiaohui Li, Guozhen Liang, Xiaonan Hu and Qi Jie Wang ()
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By Yongzhe Zhang: School of Electrical and Electronic Engineering, 50 Nanyang Avenue, Nanyang Technological University
Tao Liu: School of Electrical and Electronic Engineering, 50 Nanyang Avenue, Nanyang Technological University
Bo Meng: School of Electrical and Electronic Engineering, 50 Nanyang Avenue, Nanyang Technological University
Xiaohui Li: School of Electrical and Electronic Engineering, 50 Nanyang Avenue, Nanyang Technological University
Guozhen Liang: School of Electrical and Electronic Engineering, 50 Nanyang Avenue, Nanyang Technological University
Xiaonan Hu: School of Electrical and Electronic Engineering, 50 Nanyang Avenue, Nanyang Technological University
Qi Jie Wang: School of Electrical and Electronic Engineering, 50 Nanyang Avenue, Nanyang Technological University

Nature Communications, 2013, vol. 4, issue 1, 1-11

Abstract: Abstract Graphene has attracted large interest in photonic applications owing to its promising optical properties, especially its ability to absorb light over a broad wavelength range, which has lead to several studies on pure monolayer graphene-based photodetectors. However, the maximum responsivity of these photodetectors is below 10 mA W−1, which significantly limits their potential for applications. Here we report high photoresponsivity (with high photoconductive gain) of 8.61 A W−1 in pure monolayer graphene photodetectors, about three orders of magnitude higher than those reported in the literature, by introducing electron trapping centres and by creating a bandgap in graphene through band structure engineering. In addition, broadband photoresponse with high photoresponsivity from the visible to the mid-infrared is experimentally demonstrated. To the best of our knowledge, this work demonstrates the broadest photoresponse with high photoresponsivity from pure monolayer graphene photodetectors, proving the potential of graphene as a promising material for efficient optoelectronic devices.

Date: 2013
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DOI: 10.1038/ncomms2830

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