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Effect of Zn:Se ratio and of the heat-treatment on the optical properties of multi-stacked Zn/Se nanolayered thin films

G. G. RUSU1,* , M. RUSU1

Affiliation

  1. “Al.I. Cuza” University, 11 Carol I Bd., 700506 Iasi, Romania

Abstract

Zn/Se multilayered thin films (d = 230 – 450 nm) have been evaporated in the vacuum onto unheated glass substrates by multi-stacked technique. The Se source temperature varied in the 850 K – 900 K range whereas that for Zn evaporation source was of 723 K. The effect of Zn:Se ratio on the optical and structural properties of the as grown and heat-treated samples was investigated. The structural characteristics have been analyzed by XRD and AFM techniques. Both as-deposited and heated samples are amorphous. The film heating up to temperature of 540 K determines the formation of yellowish-like highly transparent ZnSe films. The optical measurements in the wavelength range 380 – 1100 nm revealed that such ZnSe films are characterized by an optical band gap of about 2.8 eV..

Keywords

Multilayered film, ZnSe, Optical properties, X-ray diffraction, AFM.

Submitted at: July 3, 2007
Accepted at: Oct. 15, 2007

Citation

G. G. RUSU, M. RUSU, Effect of Zn:Se ratio and of the heat-treatment on the optical properties of multi-stacked Zn/Se nanolayered thin films, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 10, pp. 3215-3218 (2007)