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Designing an Efficient Multimode Environmental Sensor Based on Graphene–Silicon Heterojunction
Author(s) -
Shehzad Khurram,
Shi Tianjin,
Qadir Akeel,
Wan Xia,
Guo Hongwei,
Ali Ayaz,
Xuan Weipeng,
Xu Hua,
Gu Zhongze,
Peng Xinsheng,
Xie Jin,
Sun Litao,
He Qiyuan,
Xu Zhen,
Gao Chao,
Rim YouSeung,
Dan Yaping,
Hasan Tawfique,
Tan Pingheng,
Li Erping,
Yin Wenyan,
Cheng Zhiyuan,
Yu Bin,
Xu Yang,
Luo Jikui,
Duan Xiangfeng
Publication year - 2017
Publication title -
advanced materials technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.184
H-Index - 42
ISSN - 2365-709X
DOI - 10.1002/admt.201600262
Subject(s) - materials science , optoelectronics , sensitivity (control systems) , capacitive sensing , schottky diode , graphene , relative humidity , amplifier , multi mode optical fiber , humidity , resistive touchscreen , silicon , heterojunction , diode , cmos , electrical engineering , electronic engineering , nanotechnology , optics , physics , optical fiber , engineering , thermodynamics
By exploiting the adsorbent gaseous molecules induced changes in intrinsic properties of graphene/silicon (Gr/Si) Schottky junction, the authors report a sensitive, low‐power consuming, multimode environmental sensor. By combining an array of Gr/Si Schottky diodes with a differential amplifier circuit, the authors are able to not only differentiate the temperature coefficient and humidity sensing, but also monitor the sun‐light exposure time. Our device is particularly sensitive toward humidity in both forward and reverse biased, and works in resistive as well as capacitive mode. Sensitivity of our devices reached to 17%, 45%, 26%, and 32% per relative humidity (%RH) for reverse biased, forward biased, resistive, and capacitive modes, respectively. In the reverse mode, the power consumption is as low as 2 nW. Moreover, our sensor response is highly selective, with sensitivity lower than 1% for other gases present in atmosphere including H 2 , O 2 , N 2 , and CO 2 . High sensitivity, low‐power consumption, multiple operation modes, and high selectivity promises application of our sensor for industrial and home safety, environmental monitoring such as indoor and outdoor air conditions, process monitoring, and others.