Effect of CdCl_2/annealing on the crystalline transformation of CdTe thin films grown by evaporation at a low substrate temperature

Authors

İSMAİL POLAT
SALİH YILMAZ
EMİN BACAKSIZ
MUSTAFA ALTUNBAŞ
MURAT TOMAKİN

DOI

10.3906/fiz-0902-5

Abstract

The structural and optical properties of CdTe thin films prepared at a low substrate temperature were investigated before and after the CdCl_2/annealing. The crystal structure of CdTe film was cubic with a strong (111) preferential orientation. Annealing at 400 °C without CdCl_2 treatment results in a decrease in the (111) peak intensity while the intensities of the (220), (311) and (331) peaks appeared, indicating that the texture is significantly changed. However, after the CdCl_2/annealing, the film exhibited a hexagonal phase as a dominant structure. The scanning electron microscopy patterns showed that the as-deposited and annealed samples had almost the same grain size. However, the grain size of the sample annealed after the CdCl_2 treatment increased significantly. The optical band gap values for the as grown and CdCl_2/annealed films were determined to be \sim 1.48 eV and \sim 1.49 eV, respectively.

Keywords

Thin films, vacuum deposition, electron diffraction, crystal structure

First Page

197

Last Page

202

Recommended Citation

POLAT, İSMAİL; YILMAZ, SALİH; BACAKSIZ, EMİN; ALTUNBAŞ, MUSTAFA; and TOMAKİN, MURAT (2011) "Effect of CdCl_2/annealing on the crystalline transformation of CdTe thin films grown by evaporation at a low substrate temperature," Turkish Journal of Physics: Vol. 35: No. 2, Article 14. https://doi.org/10.3906/fiz-0902-5
Available at: https://journals.tubitak.gov.tr/physics/vol35/iss2/14