Structural, optical, electrical and positron annihilation studies of CdS:Fe system

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• 作者：Balram Tripathi ; F. Singh ; D.K. Avasthi ; A.K. Bhati ; D. Das ; Y.K. Vijay
• 关键词：Fe²⁺ doped CdS ; Optical absorption ; DC electrical conductivity ; Positron annihilation lifetime
• 刊名：Journal of Alloys and Compounds
• 出版年：2008
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：24 April 2008
• 卷：454
• 期：1-2
• 页码：97-101
• 文件大小：686 K

摘要

Nanocrystals of Cd_1−xFe_xS (x = 0–0.05) have been synthesized by aqueous solution precipitation method at room temperature. The effect of doping of Fe²⁺ ions (0–0.05) on CdS compound semiconductor has been studied, using X-ray diffraction (XRD), optical absorption (UV–vis), photoluminescence (PL), and positron annihilation spectroscopy (PAS). The structure of these nanocrystals is found to be single phase hexagonal. Optical absorption is found to be decreased on increasing the Fe²⁺ ions concentration. PL spectra are studied on most prominent excitation peaks within the wavelength range (586–731 nm). The emission intensities are found to be decreased on increasing Fe²⁺ ions concentration. DC electrical conductivity is found to be increased on increasing Fe²⁺ ions at room temperature. The Cd vacancy concentration decreases with increasing Fe concentration.