Photoluminescence properties of ZnO nanoneedles grown by metal organic chemical vapor deposition

Photoluminescence properties of ZnO nanoneedles grown by metal organic chemical vapor deposition
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金属有机化学气相沉积法生长的ZnO纳米针的光致发光特性

DOI:
10.1063/1.2980335
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发表时间:
2008-09
影响因子:
3.2
通讯作者:
Lin, Shisheng
Lin, Shisheng
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
He, Haiping;Zhao, Binghui;Huang, Jingyun;Ye, Zhizhen;Zhu, Liping;Lin, Shisheng

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作者报道了用金属有机化学气相沉积法(MOCVD)生长ZnO纳米针(NNs)。光致发光光谱的NN在20 K的占主导地位的表面激子(SX)发射在3.367 eV。变温光致发光结果表明,SX(~ 11.2meV)和施主束缚激发(~ 21 meV)的猝灭激活能与它们的局域化能接近。  从20 K到室温,没有观察到明显的绿色发射。这些特征表明,通过MOCVD生长的NN表面不一定会受到通过气相传输法生长的ZnO纳米棒表面的非辐射或深能级缺陷的影响。此外,我们用三种不同的表达式拟合了A自由激子跃迁能随温度变化的数据,并对结果进行了描述和比较。德拜温度和爱因斯坦温度分别为660和238 K。研究了FXA峰的半高宽与温度的关系。
The authors report on growth of ZnO nanoneedles (NNs) by metal organic chemical vapor deposition (MOCVD). Photoluminescence spectra of the NNs at 20 K are dominated by a surface excitonic (SX) emission at 3.367 eV. Temperature-dependent PL reveals the activation energies for the quenching of SX (∼11.2 meV) and donor bound excition (∼21 meV) are close to their localization energies. From 20 K to room temperature, no obvious green emission is observed. These characteristics demonstrate that the surface of NNs grown by MOCVD are not necessarily subjected to nonradiative or deep-level defects on the surface of ZnO nanorods grown by vapor transport method. Furthermore, using three different expressions, we fit the data of temperature dependent A free exciton energy (FXA) transition energy and the results are described and compared. The Debye and Einstein temperatures are found to be 660 and 238 K, respectively. The dependence of the full width at half maximum of the FXA peak as a function of temperature is inv...
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