CdS薄膜的生长和结构分析

使用化学浴沉积(CBD)在硫酸镉-硫脲的氨溶液中,成功地制备出了高质量的CdS薄膜.用扫描电境(SEM)、X射线衍射(XRD)及紫外-可见-近红外光谱仪对其进行了测试分析,结果表明,NH3摩尔浓度对生成CdS薄膜的表面致密性影响很大,当NH3摩尔浓度比较大时,无法生成连续致密的胶体颗粒薄膜,反应体系中S2-和Cd2 溶液的摩尔浓度增加,CdS胶体粒度增大.在相同NH3摩尔浓度下,随着S2-和Cd2 摩尔浓度比值([S2-]/[Cd2 ])的增大,CdS胶体粒子粒度减小;透过光谱的峰位随着胶体粒子尺寸的减小向短波方向移动,当NH3摩尔浓度变化时,在一定的范围内改变CdS膜的透过率.将化学浴沉积(CBD)过程的研究从薄膜厚度优化改进为胶体粒子尺寸优化,促进了CBD技术的发展.

Growth and microstructure analysis of CdS films

The high-quality CdS films was fabricated in common ammines solution of CdSO_4 and SC(NH_2)_2 by the CBD technology,and was characterized by the SEM,XRD and UV-Vis-NIR spectrum analysis.It was found that the quality of CBD-CdS films was dependent on the NH_3 concentration.Higher NH_3 concentration led to the formation of the incoherent and unfastened film,and higher S~(2-) and Cd~(2+) concentration tend to increase the size of CdS colloidal particles,but increasing S~(2-) and Cd~(2+) concentration ratio([S~(2-)]/[Cd~(2+)]) will decrease the size of CdS colloidal particles under the same NH_3 concentration.It was also found that the peak position of the transmittances of the CdS films was dependent on the size of CdS colloidal particles.Decreasing of the size will cause the blue-shift.The overage transmittances was slightly influenced by the NH_3 concentration.Meanwhile,the CBD was improved by promoting the films thickness optimization to the colloidal particle size optimization.