ABSTRACT

Highly transparent thin films of aluminium doped ZnO along with specific silver co-doping are deposited by sol-gel spin coating, which show preferred single orientation along (100) plane. Presence of Al dopant reduces, whereas co-doping with Ag improves crystallinity. Films show sharp absorption in near UV region and band gap observes minor shifts. UV and blue emission peaks are seen in the photoluminescence spectra. UV and blue emission peaks, respectively, demonstrate a fairly large i.e. 43% and 77% rise in the normalised intensity. Presence of Ag causes rise in UV peak because of enhanced excitonic recombination probability. Rise of blue emission intensity is ascribed to creation of Ag-Al interstitials. Surface roughness increases to 210.0 nm with Al increment into ZnO and drops drastically to 81.1 nm by Ag co-doping. Boundaries of nanostructures club together with rise in Al amount and thereafter Ag co-doping is seen to reduce the particle size.

摘要

高度透明的铝掺杂 ZnO 薄膜以及特定的银共掺杂通过溶胶-凝胶旋涂沉积，显示出沿 (100) 面的优选单取向。Al 掺杂剂的存在减少了，而与 Ag 的共掺杂提高了结晶度。薄膜在近紫外区显示出明显的吸收，带隙观察到微小的变化。在光致发光光谱中可以看到 UV 和蓝色发射峰。UV 和蓝色发射峰分别表现出相当大的标准化强度，即 43% 和 77% 的上升。由于增强的激子复合概率，Ag 的存在会导致 UV 峰的升高。蓝色发射强度的上升归因于 Ag-Al 间隙的产生。随着 Al 增加到 ZnO 中，表面粗糙度增加到 210.0 nm，并通过 Ag 共掺杂急剧下降到 81.1 nm。