Characterization of Molybdenum (IV) Sulfide Prepared by Chemical Vapor Deposition Using Differential Reflectance Spectroscopy

Abstract

Molybdenum (IV) sulfide is widely employed in electronic device applications. Recognized as one of the most efficacious methods for fabricating high-quality molybdenum (IV) sulfide, the chemical vapor deposition (CVD) method’s application necessitates the development of a straightforward, swift and nondestructive characterization tool. Thus, this paper presents a rapid and reliable differential reflectance spectroscopy (DRS) instrumentation, grounded on the optical microscope, capable of characterizing two-dimensional materials prepared by CVD. This universal nondestructive identification tool facilitates the investigation of two-dimensional materials on both opaque and transparent substrates. MoS₂ samples prepared by CVD were characterized on SiO₂/Si and sapphire substrate. The results indicate that the exciton absorption peak can be accurately identified, validating the instrumentation’s utility for material detection and monolayer identification. The characterization results, corroborated by the Raman spectra with a wavenumber difference of approximately 20 cm⁻¹ and the triangular appearance of the optical image, affirm the application of this instrumentation. Ultimately, the DRS instrumentation provides a swift and nondestructive route to characterize physical properties such as bandgap and optical properties for two-dimensional materials.

Keywords:

• Chemical vapor deposition (CVD)
• differential reflectance spectroscopy (DRS)
• molybdenum (IV) sulfide
• optical characterization

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was financially supported by the Double Innovation Doctor of Jiangsu Province (grant number: JSSCBS20220698), the Basic Science (Natural Science) Research General Projects in Higher Education Institutions of Jiangsu Province (grant number: 23KJB130007), and Shandong Provincial Natural Science Foundation (grant number: ZR2023QF023).