摘要
采用化学溶池沉积法在玻璃衬底上制备ZnS薄膜。为了解联氨在沉积过程中的作用,采用金相显微镜、XRD、nkd-薄膜分析系统对薄膜形貌、结构和光学性能进行分析。结果表明:随着联氨浓度的增加,衬底表面形核点数目增加,分布均匀,薄膜颗粒得到细化。结合Zn2+的络合前驱体、络合常数及其三元络合常数计算、氢键及空间位阻等方面的分析,认为会出现3种不同的络合前驱离子,分别为Zn(NH3)24+、Zn(NH3)x(N2H4)2y+、2+Zn(NH3)3。这些Zn2+的前驱体影响着衬底形核点的数目、分布与薄膜的均匀性。在适当条件下,联氨不再起辅助沉积的作用,而是与氨一起形成三元络合配位体系,共同参与沉积。通过改变联氨浓度,可以制备出在550～1000nm的波长范围内透过率达95%以上、反射率与透过率相对应、均匀平整的非晶薄膜。
ZnS thin films were deposited on glass substrates by chemical bath deposition（CBD） method.The morphological, structural and optical properties of ZnS thin films were investigated by optical microscope, XRD and nkd-spectrophotometer.The results show that with N2H4 concentration increasing, the number of active points on the surface of substrate is improved and the grain size of thin films becomes smaller.At the same time, the uniformity of active points of surface is improved.Combining the analysis of complex precursor of Zn2＋, the stability constant of ternary complex and its calculation, hydrogen bond with steric crowding of complex, there are three major precursors, such as 2＋ Zn（NH 3）4, Zn（NH3 ）x（N2H4）2y＋ and Zn（NH 3 ）32＋, which influence the number, distribution of active points and the uniformity of thin films with increasing N2H4 concentration.The appearance of Zn（NH3 ）x（N2H4）2y＋ means that hydrazine is not also a usual complementary agent, it becomes a complex precursor of Zn2＋with amine.By changing the concentrations of N2H4, the uniform, smooth and un-crystal ZnS thin films, whose reflectivity is larger than 95% at the wavelength ranging from 550 nm to 1 000 nm and the reflectivity spectra correspond well with their transmission spectra, can be obtained.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2009年第9期1706-1711,共6页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(50963003)
江西省教育厅青年科学基金资助项目(GJJ09566)
关键词
ZNS薄膜
化学水浴
联氨浓度
络合前驱体
ZnS thin film
chemical bath deposition
N2H4 concentration
complex precursor
