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氧化锌纳米结构及掺杂材料的带隙变窄与变宽

Band Gap Narrowing and Widening of ZnO Nanostructures and Doped Materials.

作者信息

Kamarulzaman Norlida, Kasim Muhd Firdaus, Rusdi Roshidah

机构信息

Centre for Nanomaterials Research, Institute of Science, Universiti Teknologi MARA, Level 3, Block C, 40450, Shah Alam, Selangor, Malaysia,

出版信息

Nanoscale Res Lett. 2015 Dec;10(1):1034. doi: 10.1186/s11671-015-1034-9. Epub 2015 Aug 29.

DOI:10.1186/s11671-015-1034-9
PMID:26319225
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4552709/
Abstract

Band gap change in doped ZnO is an observed phenomenon that is very interesting from the fundamental point of view. This work is focused on the preparation of pure and single phase nanostructured ZnO and Cu as well as Mn-doped ZnO for the purpose of understanding the mechanisms of band gap narrowing in the materials. ZnO, Zn0.99Cu0.01O and Zn0.99Mn0.01O materials were prepared using a wet chemistry method, and X-ray diffraction (XRD) results showed that all samples were pure and single phase. UV-visible spectroscopy showed that materials in the nanostructured state exhibit band gap widening with respect to their micron state while for the doped compounds exhibited band gap narrowing both in the nano and micron states with respect to the pure ZnO materials. The degree of band gap change was dependent on the doped elements and crystallite size. X-ray photoelectron spectroscopy (XPS) revealed that there were shifts in the valence bands. From both UV-visible and XPS spectroscopy, it was found that the mechanism for band gap narrowing was due to the shifting of the valance band maximum and conduction band minimum of the materials. The mechanisms were different for different samples depending on the type of dopant and dimensional length scales of the crystallites.

摘要

掺杂氧化锌中的带隙变化是一种已被观察到的现象，从基础研究的角度来看非常有趣。这项工作专注于制备纯的单相纳米结构氧化锌以及铜和锰掺杂的氧化锌，目的是了解材料中带隙变窄的机制。采用湿化学方法制备了氧化锌、Zn0.99Cu0.01O和Zn0.99Mn0.01O材料，X射线衍射（XRD）结果表明所有样品均为纯单相。紫外可见光谱表明，纳米结构状态的材料相对于其微米状态呈现出带隙变宽，而对于掺杂化合物，相对于纯氧化锌材料，在纳米和微米状态下均呈现出带隙变窄。带隙变化的程度取决于掺杂元素和微晶尺寸。X射线光电子能谱（XPS）显示价带存在位移。从紫外可见光谱和XPS光谱都发现，带隙变窄的机制是由于材料的价带最大值和导带最小值发生了移动。根据掺杂剂的类型和微晶的尺寸长度尺度，不同样品的机制有所不同。

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