4.6 Article

Investigation of multi-layered graphene/silicon Schottky junction in oxidizing atmosphere

Journal

JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 54, Issue 37, Pages -

Publisher

IOP Publishing Ltd
DOI: 10.1088/1361-6463/ac0d71

Keywords

graphene; Schottky junction; Schottky barrier height; gas-sensors; NO2; liquid phase exfoliation

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This study investigates a rectifying device based on solution-processed multilayered graphene (MLG), studying its behavior when exposed to oxidizing atmosphere, particularly nitrogen oxide (NO2), and comparing it with a chemiresistor. The research paves the way for low-cost, highly sensitive graphene-based heterojunctions without technological complexity.
In this study, we investigate a Schottky junction based on solution-processed multilayered graphene (MLG). We present a rectifying device obtained with a straightforward approach, that is drop-casting a few microliters of MLG solution simultaneously onto Si, Si-SiO2 and Si-SiO2-Cr/Au surface. Monitoring the modulation of Schottky barrier height while operating in reverse bias, we study the behavior of such prepared MLG-Si/junction (MLG-Si/J) when exposed to oxidizing atmosphere, especially to nitrogen oxide (NO2). We finally compare the sensing behavior of MLG-Si/J at 1 ppm of NO2 with that of a chemiresistor-based on similarly prepared solution-processed MLG. Our study thus opens the path towards low-cost highly sensitive graphene-based heterojunctions advantageously fabricated without any complexity in the technological process.

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