Compositional origin of surface roughness variations in air-annealed ZnO single crystals
Compositional origin of surface roughness variations in air-annealed ZnO single crystals
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DOI：
10.1016/j.apsusc.2007.07.206
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发表时间：
2008-02
影响因子：
6.7
通讯作者：
D. Pugel;R. Vispute;S. Hullavarad;T. Venkatesan;B. Varughese
中科院分区：
文献类型：
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作者：
D. Pugel;R. Vispute;S. Hullavarad;T. Venkatesan;B. Varughese
我们直接研究了退火温度高达1000°C的空气退火ZnO单晶样品表面粗糙度变化的化学成分来源。原子力显微镜（AFM）显示了表面粗糙度和形貌的温度依赖性变化，在400°C下退火的样品的表面粗糙度最大为2nm。通过X射线光电子能谱（XPS）测量的O（1 s）线显示在400°C下Zn（OH）2的最大值和非化学计量ZnO的最小值;而Zn（2 p）峰显示在该温度下斜率增加。这些结果表明，粗糙度是由Zn扩散和表面氧的损失引起的。
We directly investigated the chemical compositional origin of surface roughness variations in air-annealed ZnO single crystal samples for annealing temperatures up to 1000°C. Atomic Force Microscopy (AFM) showed temperature-dependent changes in surface roughness and morphology, with a maximum in surface roughness of 2nm found for samples annealed at 400°C. The O(1s) line, measured by X-ray Photoelectron Spectroscopy (XPS) showed a maximum for Zn(OH)2and a minimum for off-stoichiometric ZnO at 400°C; while the Zn(2p) peaks show an increase in slope at that temperature. These results indicate that the roughness arises from Zn diffusion and loss of surface oxygen.