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Title: Mechanosynthesis, deposition and characterization of CZTS and CZTSe materials for solar cell applications

Mechanosynthesis of nanocrystalline powders of CZTS and CZTSe by ball milling technique and the physical properties of thermally evaporated CZTS and CZTSe thin films as a function of substrate temperature are investigated. Nanocrystalline Cu–Zn–Tin–Sulphide (CZTS) and Cu–Zn–Tin–Selenide (CZTSe) powders synthesized by ball milling at different milling time using the source materials of Cu, Zn, Sn, S (or) Se in the ratio 2:1:1:4 are investigated. The above synthesized powder was thermally evaporated on glass substrate kept at room temperature and 673 K under a vacuum of 10{sup −6} mbar to prepare quaternary compound semiconducting thin films in a single step process. The synthesized powder and deposited CZTS and CZTSe thin films belong to tetragonal crystal system. Raman spectra reveal that the synthesized nanocrystals are pure without any secondary phases. A gradual reduction in optical bandgap of films was observed with increasing substrate temperature due to increased crystallinity of the films. The changes in surface morphology of the films with respect to substrate temperature were studied by scanning electron microscopy and atomic force microscopy. Electrical studies indicate that the deposited films have p-type conductivity. - Highlights: • Nanocrystalline powders of CZTS and CZTSe are synthesized by ball milling technique. • The ballmore » milled powder was thermally evaporated on glass at room temperature and 673 K. • Raman spectroscopy reveals that the synthesized nanocrystals are pure without any secondary phases. • SEM and AFM micrographs illustrate the granular type of growth and the roughness and particle sizes obtained at the substrate temperature of 673 K are higher than those obtained in the room temperature. • Hall coefficient obtained for the film confirms the p-type conductivity. • A gradual reduction in optical bandgap was observed with increasing substrate temperature.« less
Authors:
 [1] ;  [2] ;  [3] ; ;  [4] ;  [1] ;  [2]
  1. Centre for Nanoscience and Nanotechnology, Sathyabama University, Chennai 600 119, Tamilnadu (India)
  2. (India)
  3. Department of Physics, Maamallan Institute of Technology, Sriperumpudur 602 105, Tamilnadu (India)
  4. Department of Physics, Anna University, Chennai 600 025, Tamilnadu (India)
Publication Date:
OSTI Identifier:
22475695
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 227; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ATOMIC FORCE MICROSCOPY; COPPER COMPOUNDS; CRYSTALS; MORPHOLOGY; NANOMATERIALS; NANOSTRUCTURES; PARTICLE SIZE; QUATERNARY ALLOY SYSTEMS; QUATERNARY AMMONIUM COMPOUNDS; RAMAN SPECTRA; RAMAN SPECTROSCOPY; SCANNING ELECTRON MICROSCOPY; SOLAR CELLS; SUBSTRATES; THIN FILMS; TIN SELENIDES; TIN SULFIDES; ZINC COMPOUNDS