Electrical conduction and photoluminescence properties of solution-grown ZnO nanowires
Electrical conduction and photoluminescence properties of solution-grown ZnO nanowires
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DOI：
10.1063/1.2751116
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发表时间：
2007-07
影响因子：
3.2
通讯作者：
F. Jones;F. Léonard;A. Talin;N. Bell
中科院分区：
文献类型：
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作者：
F. Jones;F. Léonard;A. Talin;N. Bell
我们报告的光学和电学性质的氧化锌纳米棒在溶液中合成使用Oswald熟化的ZnO纳米点与添加乙二胺生长导向剂。该方法产生高质量的单晶ZnO纳米棒，其长度可达3μm，平均直径为25±7nm，而类似制备的纳米棒的直径为约75nm，但没有添加生长导向剂。此外，我们发现，更高的纵横比的纳米棒表现出强烈的尺寸依赖性的电气特性，与约27 nm的临界直径界定非导电和导电行为。理论计算表明，这种尺寸依赖性的导电性的起源是存在的表面状态，耗尽在较小直径的纳米棒中的载流子，并提供这些状态的密度的估计。
We report on the optical and electrical properties of zinc oxide nanorods synthesized in solution using Oswald ripening of ZnO nanodots with the addition of ethylenediamene growth directing agent. This method results in high quality, single crystalline ZnO nanorods that extend up to 3μm in length and have an average diameter of 25±7nm, compared to ∼75nm diameter for similarly prepared nanorods but without the addition of the growth directing agent. Furthermore, we find that the higher aspect ratio nanorods exhibit strong size-dependent electrical characteristics, with a critical diameter of about 27nm delimiting nonconductive and conductive behaviors. Theoretical calculations indicate that the origin of this size-dependent conductivity is the presence of surface states that deplete the carriers in the smaller diameter nanorods, and an estimate of the density of these states is provided.