Position-sensitive-detectors (PSDs) based on lateral photoeffect has been widely used in diverse applications, including optical engineering, aerospace and military fields. With increasing demand in long distance, low energy consumption, and weak signal sensing systems, the poor responsivity of conventional PSDs has become a bottleneck limiting its applications. Herein, we present a high performance graphene based PSDs with revolutionary interfacial amplification mechanism. Signal amplification in the order of ~10^4 has been demonstrated by utilizing the ultrahigh mobility of graphene and long lifetime of photo-induced carriers at the interface of SiO2/Si. This would improve the detection limit of Si-based PSDs from uW to nW level, without sacrificing the spatial resolution and response speed. Such interfacial amplification mechanism is compatible with current Si technology and can be easily extended to other sensing systems.
@article{arxiv.1706.04075,
title = {Interfacial amplification for graphene based position-sensitive-detectors},
author = {Wen-Hui Wang and Ru-Xia Du and Xi-Tao Guo and Jie Jiang and Wei-Wei Zhao and Zhong-Hua Ni and Xin-Ran Wang and Yu-Meng You and Zhen-Hua Ni},
journal= {arXiv preprint arXiv:1706.04075},
year = {2017}
}
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18 pages, 10 figures, to appear in Light: Science & Applications