Composition and growth procedure-dependent properties of electrodeposited CuInSe2 thin films

S. Moorthy Babu, A. Ennaoui, M. Ch Lux-Steiner

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Abstract

CuInSe2 thin films were deposited on molybdenum-coated glass substrates by electrodeposition. Deposition was carried out with a variety of electrochemical bath compositions. The quality of the deposits depends very much on the source materials as well as the concentration of the same in the electrolyte. The deposition potential was varied from -0.4 to -0.75 V vs. SCE. The pH of the solution was adjusted to 1.5-2 using diluted sulphuric acid. Chloride salts containing bath yield good surface morphology, but there is always excess of the metallic content in the deposited films. Different growth procedures, like initial metallic layers of copper or indium, layers of copper selenide or indium selenide before the actual deposition of ternary chalcopyrite layers were attempted. Fabrication pathway, morphological and compositional changes due to the different precursor route has been analysed. The quality of the deposits prepared by one-step electrodeposition is better than the deposits with a two-stage process. The deposited films were characterized with XRD, SEM-EDAX, UV-visible spectroscopy and I-V characteristics. The deposited films were annealed in air as well as in nitrogen atmosphere. The influence of annealing temperature, environment and annealing time on the properties of the films are evaluated. Attempts were made to fabricate solar cell structure from the deposited absorber films. The structure of Mo/CuInSe2/CdS/ZnO/Ni was characterized with surface, optical and electrical studies.

Original languageEnglish
JournalJournal of Crystal Growth
Volume275
Issue number1-2
DOIs
Publication statusPublished - 15 Feb 2005
Externally publishedYes

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Keywords

  • A2. Electrochemical growth
  • B3. Solar cells

ASJC Scopus subject areas

  • Condensed Matter Physics

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