Low-Temperature Hydrothermal Synthesis of Colloidal Crystal Templated Nanostructured Single-Crystalline ZnO
Low-Temperature Hydrothermal Synthesis of Colloidal Crystal Templated Nanostructured Single-Crystalline ZnO
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DOI：
10.1021/acs.chemmater.7b03466
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发表时间：
2017-11-28
影响因子：
8.6
通讯作者：
Braun, Paul V.
中科院分区：
文献类型：
--
作者：
Miyake, Masao;Suginohara, Makoto;Braun, Paul V.
单晶半导体几乎总是表现出比多晶线或非晶半导体更好的光电性能。虽然三维（3D）纳米结构半导体器件已被提出用于许多应用，但在绝大多数报告中，半导体是多晶或非晶的，大大降低了先进性能的潜力。虽然利用3D模板制造半导体的3D结构技术已经取得了显著进展，但在模板内外延生长纳米结构单晶半导体的方法仍然有限。在这里，我们利用流动反应器，通过低温（类似于80℃）水热工艺，通过225和600 nm直径的胶体颗粒形成的胶体模板，展示了3d结构ZnO的外延生长。考察了反应溶液的pH值和添加剂对三维外延过程的影响。通过反射率、光致发光和霍尔效应测量，研究了外延生长纳米结构ZnO的光学和电学性质。研究发现，外延生长的纳米结构ZnO总体上表现出优于多晶ZnO的性能。所展示的水热外延工艺应该适用于其他基于化学溶液的沉积技术，并有助于扩展可以生长成3D纳米结构单晶形式的材料的范围。
Single crystal semiconductors almost always exhibit better optoelectrical properties than their polycrystal-line or amorphous counterparts. While three-dimensionally (3D) nanostructured semiconductor devices have been proposed for numerous applications, in the vast majority of reports, the semiconductor is polycrystalline or amorphous, greatly reducing the potential for advanced properties. While technologies for 3D structuring of semiconductors via use of a 3D template have advanced significantly, approaches for epitaxially growing nanostructured single crystal semiconductors within a template remain limited. Here, we demonstrate the epitaxial growth of 3D-structured ZnO through colloidal templates formed from 225 and 600 nm diameter colloidal particles via a low-temperature (similar to 80 degrees C) hydrothermal process using a flow reactor. The effects of the pH of the reaction solution as well as the additive used on the 3D epitaxy process are investigated. The optical and electrical properties of the epitaxially grown nanostructured ZnO are probed by reflectance, photoluminescence, and Hall effect measurements. It is found that the epitaxially grown nanostructured ZnO generally exhibits properties superior to those of polycrystalline ZnO. The demonstrated hydrothermal epitaxy process should be applicable to other chemical solution-based deposition techniques and help extend the range of materials that can be grown into a 3D nanostructured single-crystalline form.