Optical and Electrical Performance of SnO2 Capped ZnO Nanowire Arrays

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• 作者：Liang Shi ; Yeming Xu ; Suikong Hark ; Yang Liu ; Sheng Wang ; Lian-mao Peng ; Kawai Wong ; Quan Li
• 刊名：Nano Letters
• 出版年：2007
• 出版时间：December 2007
• 年：2007
• 卷：7
• 期：12
• 页码：3559 - 3563
• 全文大小：235K
• 年卷期：v.7,no.12(December 2007)
• ISSN：1530-6992

文摘

Two-junction-nanowire arrays (SnO₂ capped ZnO nanowire arrays on Zn substrate) are synthesized using a two-step-solution-reaction. Thebare single crystalline ZnO nanowires give reasonably intense band edge luminescence but also strong green emission likely due to surfacedefects. The SnO₂ capping treatment not only introduces caps on the tip of the ZnO nanowires but also partially passivates the nanowiresurfaces, leading to improved near band edge emission and the suppression of the defect luminescence. The nanowire array configurationallows a straight forward electrical measurement on the single nanowire junction (Zn-ZnO-SnO₂). The I-V results indicate that a little barrierexists in between the Zn substrate and the nanowire. The observation of more complicated electrical behaviors of the two-junction system(Zn/ZnO/SnO₂) discloses the nonuniform doping of the SnO₂ cap, which is consistent with the EDX compositional analysis.