Oxide Trap-Induced RTS in MOSFETs

Rouf, A. S. M. Shamsur; Çelik‐Butler, Zeynep

doi:10.1007/978-3-030-37500-3_17

Cited by 2 publications

(1 citation statement)

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“…Also, it is important to notice that while noise usually is undesirable, it can give valuable information. Noise spectroscopy and random telegraph signal (RTS) analysis is commonly used to study the oxide interface traps in field-effect transistors, and 1/ f noise spectroscopy was already used to study the diffusion of Ne atoms on the graphene surface at cryogenic temperatures . Noise can also be used as a parameter for substance identification and to create single-device electronic noses .…”

Section: Introductionmentioning

confidence: 99%

Anomalous Random Telegraph Signal in Suspended Graphene with Oxygen Adsorption: Implications for Gas Sensing

de Moraes Nogueira,

Kareekunnan,

Akabori

et al. 2023

ACS Appl. Nano Mater.

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Graphene is a promising material for sensing applications because of its large specific surface area and low noise. In many applications, graphene will inevitably be in contact with oxygen since it is the second most abundant gas in the atmosphere. Therefore, it is of interest to understand how this gas affects the sensor properties. In this work, the effect of oxygen on the low-frequency noise of suspended graphene is demonstrated. Devices with suspended graphene nanoribbons with a width (W) and length (L) of 200 nm were fabricated. The resistance as a function of time was measured in a vacuum and pure oxygen atmosphere through an ac lock-in method. After signal processing with wavelet denoising and analysis, it is demonstrated that oxygen causes random telegraph signal (RTS) in the millisecond scale, with an average dwell time of 2.9 milliseconds in the high-resistance state and 2 milliseconds in the low-resistance state. It is also shown that this RTS occurs only at some periods, which indicates that, upon adsorption, the molecules take some time until they find the most energetically favorable adsorption state. Also, a slow-down in the RTS time constants is observed, which infers that less active sites are available as time goes on because of oxygen adsorption. Therefore, it is important to consider these effects to guarantee high sensitivity and high durability of gas sensors based on graphene that will be exposed to oxygen during their lifetime.

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Section: Introductionmentioning

confidence: 99%