Polarity Assignment in ZnTe, GaAs, ZnO, and GaN-AlN Nanowires from Direct Dumbbell Analysis
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- 作者：Maria de la Mata ; Cesar Magen ; Jaume Gazquez ; Muhammad Iqbal Bakti Utama ; Martin Heiss ; Sergei Lopatin ; Florian Furtmayr ; Carlos J. Fern谩ndez-Rojas ; Bo Peng ; Joan Ramon Morante ; Riccardo Rurali ; Martin Eickhoff ; Anna Fontcuberta i Morral ; Qihua Xiong ; Jordi Arbiol
- 刊名：Nano Letters
- 出版年：2012
- 出版时间：May 9, 2012
- 年：2012
- 卷：12
- 期：5
- 页码：2579-2586
- 全文大小：665K
- 年卷期：v.12,no.5(May 9, 2012)
- ISSN：1530-6992
文摘
Aberration corrected scanning transmission electron microscopy (STEM) with high angle annular dark field (HAADF) imaging and the newly developed annular bright field (ABF) imaging are used to define a new guideline for the polarity determination of semiconductor nanowires (NWs) from binary compounds in two extreme cases: (i) when the dumbbell is formed with atoms of similar mass (GaAs) and (ii) in the case where one of the atoms is extremely light (N or O: ZnO and GaN/AlN). The theoretical fundaments of these procedures allow us to overcome the main challenge in the identification of dumbbell polarity. It resides in the separation and identification of the constituent atoms in the dumbbells. The proposed experimental via opens new routes for the fine characterization of nanostructures, e.g., in electronic and optoelectronic fields, where the polarity is crucial for the understanding of their physical properties (optical and electronic) as well as their growth mechanisms.