论文摘要
近年来纳米半导体薄膜材料因其具有奇特的物理特性和应用前景,而对Ⅱ-Ⅵ族的纳米半导体薄膜的研究越来越热。本文概述了CdTe纳米晶薄膜的低温溅射制备,并对CdTe纳米晶薄膜的掺杂情况作了讨论研究。本文系统研究了两个方面的工作:首先采用低温射频溅射法制备出了CdTe纳米晶薄膜,讨论了低温溅射法制备薄膜中不同参数(衬底、沉积时间、环境、气压、功率等)对CdTe纳米晶薄膜的特性影响。其次采用溶液浸泡法(AgNO3溶液)对CdTe纳米晶薄膜进行Ag离子的掺杂,并讨论了制备过程中各种因素(溶液浓度、浸泡时间、退火条件)对Ag离子掺杂量及对薄膜性质的影响。通过分析薄膜的结构、形貌、光吸收等性质,我们得出一些重要结论。对于沉积时间同为1h的CdTe/glass和CdTe/Si薄膜比在CdTe/ Al2O3薄膜在(111)晶面生长有较强的择优;衬底表面对薄膜的形貌有很大的影响,表面光滑的玻璃(glass)和硅(Si)衬底比粗糙的Al2O3衬底,更有利于纳米薄膜的生长。同时沉积在玻璃衬底上的薄膜展现出了良好的光学性能;在合适的浸泡溶液浓度、浸泡时间、退火条件下对CdTe纳米晶薄膜进行了较为成功的Ag离子掺杂,并在一定程度上改善了薄膜的导电性能。
论文目录
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