Evidence of Laser‐Induced Amplification of Random Noise in WS2 Nanosheets Based Resistive System. Issue 8 (1st July 2022)

• Record Type: Journal Article
• Authors: Neog, Ashamoni; Biswas, Rajib
• Is Part Of: Physica status solidi. Volume 16:Issue 8(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-07-01
• Subjects: 1/f noise -- interdigital electrodes -- I–V characteristics -- I–t characteristics -- laser irradiation -- WS2 nanosheets; Solid state physics -- Periodicals; 530.4105
• DOI: 10.1002/pssr.202200142
• Languages: English
• ISSNs: 1862-6254

Abstract

Abstract : Electronic noises are indispensable part of stochastic resonance (SR) and other molecular neuromorphic devices. Considering the paramount significance of such devices, investigation of artificial noise generation with further amplification attributes of WS2 nanosheets based resistive unit is endeavored. To realize it, Cu interdigital electrodes (IDE) are fabricated on copper clad and chemically exfoliated hexagonal WS2 nanosheets are drop‐casted on the surface of as‐fabricated IDE. In ambient conditions as well as in the presence of resistance fluctuations and defects in the layered material, the resistive unit is found to develop noise with an average peak‐to‐peak fluctuation of ≈13 n A on the linear current–voltage (I–V) characteristics of the device. On performing irradiation with 5 mW red, green, and blue laser on to the very fabricated unit, a maximum ≈60 n A current fluctuations in the I–V characteristics are detected. Additionally, the current fluctuation is found to be more prominent for green laser than that of red and blue laser. Abstract : Herein, a WS2 ‐based resistive unit is explored for noise analysis under irradiation of lasers with different wavelength. The laser irradiation can enhance the intensity of the noise fluctuation. Such kind of system can be integrated to the conventional electronic system to generate noise of threshold level to initiate stochastic resonance phenomena in neuromorphic devices.