Fabrication and characterization of highly oriented N-doped ZnO nanorods by selective area epitaxy
Fabrication and characterization of highly oriented N-doped ZnO nanorods by selective area epitaxy
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DOI：
10.1155/2015/854074
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发表时间：
2015
影响因子：
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通讯作者：
Yang Zhang;S. Gu;K. Tang;Jiandong Ye;Haixiong Ge;Zhengrong Yao;Shunming Zhu;Youdou Zheng
中科院分区：
文献类型：
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作者：
Yang Zhang;S. Gu;K. Tang;Jiandong Ye;Haixiong Ge;Zhengrong Yao;Shunming Zhu;Youdou Zheng
采用纳米压印和化学气相输运相结合的方法，在ZnO模板上选择性地生长出高质量的氮掺杂ZnO纳米棒。生长的纳米棒在尺寸和取向上均匀，密度和表面体积比可控。利用扫描电镜、光致发光光谱和拉曼散射光谱研究了ZnO纳米棒的结构和光学性质以及N掺杂物的行为。在掺杂N的ZnO纳米棒的拉曼光谱中观察到的附加振动模式为ZnO纳米棒中掺杂N提供了确凿的证据。不同密度和表面体积比的ZnO纳米棒的激子发射差异表明其固有缺陷的空间分布不同。研究发现，引起受体结合激子（A0X）发射的缺陷最可能分布在具有非极性特征的侧壁表面，而引起供体结合激子（D0X）发射的缺陷则均匀分布在近上极表面。
High-quality nitrogen-doped ZnO nanorods have been selectively grown on patterned and bare ZnO templates by the combination of nanoimprint lithography and chemical vapor transport methods. The grown nanorods exhibited uniformity in size and orientation as well as controllable density and surface-to-volume ratio. The structural and optical properties of ZnO nanorods and the behaviour of N dopants have been investigated by means of the scanning electron microscope, photoluminescence (PL) spectra, and Raman scattering spectra. The additional vibration modes observed in Raman spectra of N-doped ZnO nanorods provided solid evidence of N incorporation in ZnO nanorods. The difference of excitonic emissions from ZnO nanorods with varied density and surface-to-volume ratio suggested the different spatial distribution of intrinsic defects. It was found that the defects giving rise to acceptor-bound exciton (A0X) emission were most likely to distribute in the sidewall surface with nonpolar characteristics, while the donor bound exciton (D0X) emission related defects distributed uniformly in the near top polar surface.