Study of soft x-ray optical properties of niobium carbide (NbC) thin film in 60 – 150 Å wavelength region

Heterostructure have attracted a lot of interest in the field of researcher due to their enhanced potential applications which include Field effect transistor, photodetector, light emitting diodes,waveguides and control band gap by taking advantages of quantum size effect etc,. Heterostructure photodetector become more appealing by mixing different band gap devices and proper tuning enables the easy movement of charge carriers from valence band to conduction band. Many heterostructure have recently been fabricated and investigated including Au-graphene, graphene-MoS₂, and Si-Ge which disclose many interesting optoelectronic properties. Synthesis of two different materials into heterostructure is important task that facilitate the properties to be enhanced and beyond the band gap of the material, finally creating high photo detection efficiency with superior performance. Our main focus was to synthesize and study the optoelectrical property of CdS-Bi₂Te₃ heterostructure. Our findings demonstrate that the absorption spectra of CdS and CdS- Bi₂Te₃ which depicts lower band gap and more light as compared to CdS thin film only. Further, CdS- Bi₂Te₃ films based heterostructure were found to be more photoconductive, with higher responsivity and greater E.Q.E, when compared to CdS due to incorporation of charge carrier from Bi₂Te₃ to CdS. (author)