Journal of Semiconductors>>2017,Volume 38>>Issue 12:123001-6    < Previous Article | Next Article >  
H. H. Güllü and M. Parlak.Investigation of post-thermal annealing on material properties of Cu-In-Zn-Se thin films[J].Journal of Semiconductors,2017,38(12):123001-6
Investigation of post-thermal annealing on material properties of Cu-In-Zn-Se thin films
Abstract: The Cu-In-Zn-Se thin film was synthesized by changing the contribution of In in chalcopyrite CuInSe2 with Zn. The XRD spectra of the films showed the characteristic diffraction peaks in a good agreement with the quaternary Cu-In-Zn-Se compound. They were in the polycrystalline nature without any post-thermal process, and the main orientation was found to be in the (112) direction with tetragonal crystalline structure. With increasing annealing temperature, the peak intensities in preferred orientation became more pronounced and grain sizes were in increasing behavior from 6.0 to 25.0 nm. The samples had almost the same atomic composition of Cu0.5In0.5ZnSe2. However, EDS results of the deposited films indicated that there was Se re-evaporation and/or segregation with the annealing in the structure of the film. According to the optical analysis, the transmittance values of the films increased with the annealing temperature. The absorption coefficient of the films was calculated as around 105 cm-1 in the visible region. Moreover, optical band gap values were found to be changing in between 2.12 and 2.28 eV depending on annealing temperature. The temperature-dependent dark- and photo-conductivity measurements were carried out to investigate the electrical characteristics of the films.
Keywords: annealing  Cu-In-Zn-Se  thin film
Author NameAffiliation
H. H. Güllü Central Laboratory, Middle East Technical University (METU), 06800 Ankara, Turkey;Center for Solar Energy Research and Applications (GÜ;NAM), METU, Ankara 06800, Turkey 
M. Parlak Department of Physics, Middle East Technical University (METU), 06800 Ankara, Turkey;Center for Solar Energy Research and Applications (GÜ;NAM), METU, Ankara 06800, Turkey 
 
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