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Title: Optoelectronic and low temperature thermoelectric studies on nanostructured thin films of silver gallium selenide

Polycrystalline thin films of silver gallium selenide were deposited on ultrasonically cleaned soda lime glass substrates by multi-source vacuum co-evaporation technique. The structural analysis done by X-ray diffraction ascertained the formation of nano structured tetragonal chalcopyrite thin films. The compound formation was confirmed by X-ray photo-electron spectroscopy. Atomic force microscopic technique has been used for surface morphological analysis. Direct allowed band gap ∼1.78eV with high absorption coefficient ∼10{sup 6}/m was estimated from absorbance spectra. Low temperature thermoelectric effects has been investigated in the temperature range 80–330K which manifested an unusual increase in Seebeck coefficient with negligible phonon drag toward the very low and room temperature regime. The electrical resistivity of these n-type films was assessed to be ∼2.6Ωm and the films showed good photo response.
Authors:
; ; ; ;  [1] ; ;  [2] ;  [3]
  1. Thin film research lab, U.C. College, Aluva, Kerala (India)
  2. Solid State Physics Laboratory, Cochin University of Science and Technology, Cochin (India)
  3. UGC-DAE CSR, Khandwa Road, Indore-452 001, Madhya Pradesh (India)
Publication Date:
OSTI Identifier:
22264031
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1576; Journal Issue: 1; Conference: OMTAT 2013: 2. international conference on optoelectronic materials and thin films for advanced technology, Kochi, Kerala (India), 3-5 Jan 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ABSORPTION; CHALCOPYRITE; DEPOSITS; ELECTRIC CONDUCTIVITY; ELECTRON SPECTROSCOPY; EVAPORATION; GALLIUM; NANOSTRUCTURES; POLYCRYSTALS; SILVER; SPECTRA; SUBSTRATES; SURFACES; THIN FILMS; X RADIATION; X-RAY DIFFRACTION