title: Spectral analysis of the emission current noise exhibited by few layer WS2 nanosheets emitter.
abstract: Spectral analysis of the field emission (FE) current fluctuations has been carried out at the base pressure ~1×10(-8) mbar. The emission current stability investigated at preset value of 2 µA is characterized by 'step' like fluctuation. The spectral analysis performed on a FFT (Fast Fourier Transform) analyzer revealed that the observed noise is of 1/fα type, with the value of α as ~1.05. The estimated value of α implies that the current fluctuations are mainly due the various processes occurring on atomic scale like adsorption, migration, and/or desorption of the residual gas species on the emitter surface.
authors.affiliation: Centre for Advanced Studies in Materials Science and Condensed Matter Physics, Department of Physics, University of Pune, Pune 411007, India.
authors.forename: Sachin R
authors.initials: SR
authors.lastname: Suryawanshi
authors.affiliation: Centre for Advanced Studies in Materials Science and Condensed Matter Physics, Department of Physics, University of Pune, Pune 411007, India.
authors.forename: Pankaj S
authors.initials: PS
authors.lastname: Kolhe
authors.affiliation: School of Basic Sciences, Indian Institute of Technology, Bhubaneswar 751013, India. Electronic address: csrout@iitbbs.ac.in.
authors.forename: Chandra S
authors.initials: CS
authors.lastname: Rout
authors.affiliation: Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pashan, Pune 411008, India; Academy of Scientific and Innovative Research, Anusandhan Bhawan, Rafi Marg, New Delhi 110001, India. Electronic address: dj.late@ncl.res.in.
authors.forename: Dattatray J
authors.initials: DJ
authors.lastname: Late
authors.affiliation: Centre for Advanced Studies in Materials Science and Condensed Matter Physics, Department of Physics, University of Pune, Pune 411007, India. Electronic address: mam@physics.unipune.ac.in.
authors.forename: Mahendra A
authors.initials: MA
authors.lastname: More
keywords: Current fluctuations; Field emission; Noise; WS(2) nanosheets