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Please use this identifier to cite or link to this item: http://eprint.iitd.ac.in/handle/2074/1429

Title: Optical, structural and photoelectron spectroscopic studies on amorphous and crystalline molybdenum oxide thin films
Authors: Sian, Tarsame S
Reddy, G B
Keywords: Optical properties
Electronic properties
Core level spectra
Valence band spectra
Energy band diagram
Issue Date: 2004
Citation: Solar Energy Materials and Solar Cells, 82(3), 375-386
Abstract: Optical, structural and electronic properties of amorphous and crystalline molybdenum oxide thin films have been investigated. As-deposited amorphous films got crystallized into a layered orthorhombic phase on annealing at 350°C. Refractive index (n) and extinction coefficient (k) of as-deposited films and films annealed at 150°C, 240°C and 350°C have been calculated using reflectance and transmittance data. Spectral dependence of absorption coefficient has been explained on the basis of charge transfer transition mechanism. Optical band gap of amorphous MoO3−x is 3.16 eV and it has increased by 0.11 eV on crystallization. XPS core level analysis reveals the presence of Mo+4, Mo+5 and Mo+5 oxidation states in amorphous films, proving oxygen deficiency in as-deposited films. Same studies on crystalline films show the presence of only Mo+6 states. Valence band spectrum of amorphous films reveal emission from Mo4d levels, which is absent in crystalline films. Complete correlation is seen between the optical properties and XPS data.
URI: http://eprint.iitd.ac.in/dspace/handle/2074/1429
Appears in Collections:Physics

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