Viscosity dependant CdS nanocrystals embedded in silicate glass

R. Tandon, R. Mishra
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Abstract

An explicit role of viscosity on the growth of semiconductor nanocrystals dispersed in silicate glass matrix is investigated. Theoretically, a simplified Arrhenius equation, lnη = A + B/T (where η is viscosity) is used to calculate the viscosities of various glass compositions. Using Diffusion - Controlled Growth model it is established that average radius of grain (QD) is inversely proportional to the cube root of the viscosity of supersaturated solid solution. Experimental evidences show that grown dot size is ranging from 2nm to 20 nm for various growth times (2–50 hr). A blue shift was observed in optical absorption edge. The optical absorption spectra depict that bang gap of CdS quantum dots ranges from bulk band gap 2.4eV to 3.2eV which confirms the strong confinement of quantum dots. Photoluminescence measurements explain the observed absorption results qualitatively. CdS doped glass samples showed the red shift of emission wavelength as the thermal treatment time and temperature increased which justifies the viscosity dependence on cluster size.
硅酸盐玻璃中黏度依赖的CdS纳米晶体
研究了黏度对分散在硅酸盐玻璃基体中的半导体纳米晶体生长的影响。理论上,用简化的Arrhenius方程lnη = a + B/T(其中η为粘度)来计算各种玻璃组分的粘度。利用扩散控制生长模型,建立了晶粒平均半径(QD)与过饱和固溶体粘度的立方根成反比。实验结果表明,在不同的生长时间(2 ~ 50小时)下,生长点的大小在2nm ~ 20nm之间。在光学吸收边观察到蓝移。光吸收光谱显示CdS量子点的弹隙在2.4 ~ 3.2eV之间,证实了量子点的强约束。光致发光测量定性地解释了观察到的吸收结果。随着热处理时间和温度的增加,CdS掺杂玻璃样品的发射波长发生了红移,证明了粘度与簇大小的依赖关系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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