Mixed Phase Compositions of MoS2 Ultra Thin Film Grown by Pulsed Laser Deposition. (2018)

• Record Type: Journal Article
• Authors: Barvat, Arun; Prakash, Nisha; Singh, Dilip K.; Dogra, Anjana; Khanna, Suraj P.; Singh, Sandeep; Pal, Prabir
• Is Part Of: Materials today. Volume 5:Number 1(2018)Part 2
• Page Start: 2241
• Page End: 2245
• Publication Date: 2018
• Subjects: MoS2 -- Pulse laser deposition(PLD) -- 1T-and 2H phases -- Raman -- X-ray photoelectron spectroscopy(XPS); Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2017.09.225
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: We demonstrate the growth of ultra thin film of molybdenum disulfide on semi-insulating GaN/ c -Al2 O3 (0001) substrates by pulsed laser deposition. The sample was characterized by Atomic force microscopy, Raman spectroscopy and X-ray photoelectron spectroscopy. The MoS2 atomic force microscopy images show a root-mean square roughness of about 0.11 nm with some regions of clustered growth and/ or disordered surfaces. The characteristic separation between two Raman active modes has been found to be 21.6 cm -1, suggesting that the grown MoS2 film is bi-layer. Using X-ray photoelectron spectroscopic measurements, we observe the presence of mixed phase MoS2 thin film with stoichiometric mole ratio of S/Mo is about 1.85, suggesting that the film is slightly sulfur deficient under our experimental conditions.