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DFT calculations on ZnO 1−x compounds for optoelectronic applications
Journal of Computational Electronics ( IF 2.1 ) Pub Date : 2021-01-07 , DOI: 10.1007/s10825-020-01645-9
W. Ouerghui , M. S. Alkhalifah , H. Ben Abdallah

The \({\text{ZnO}}_{{1 - {\text{x}}}}\) compounds were studied theoretically using the full-potential linearized augmented plane wave (FP-LAPW) method in the modified Becke–Johnson (mBJ) technique. The TB-mBJ scheme yields accurate description of the ground state properties better than PBE-GGA approximation. The site preference and the relative stability of the defects in the \({\text{ZnO}}_{{1 - {\text{x}}}}\) compounds were studied in detail. The effect of oxygen defects on structural, compressive parameters, electronic structure and optical properties of zinc oxide was examined. The X-ray absorption (XAS) and emission (XES) spectra of the O K-edge were investigated to explore the electronic structures of \({\text{ZnO}}_{{1 - {\text{x}}}}\) compounds. The dielectric functions, absorption, reflectivity, energy loss function and optical conductivity spectra of \({\text{ZnO}}_{{1 - {\text{x}}}}\) compounds were evaluated and analyzed in detail. This study shows a significant rising in optical conductivity in the visible range, and consequently, \({\text{ZnO}}_{{1 - {\text{x}}}}\) compounds lead a way to the realization of photodetectors more sensitive in the visible region.



中文翻译:

用于光电应用的ZnO 1-x化合物的DFT计算

在改良的Becke上,使用全电势线性化增强平面波(FP-LAPW)方法对\({\ text {ZnO}} _ {{1-{\ text {x}}}} \}化合物进行了理论研究,约翰逊(mBJ)技术。TB-mBJ方案比PBE-GGA近似更好地描述了基态特性。详细研究了\({\ text {ZnO}} _ {{1-{\ text {x}}}} \)复合物中的位点偏爱和缺陷的相对稳定性。研究了氧缺陷对氧化锌的结构,压缩参数,电子结构和光学性质的影响。研究了O-K边缘的X射线吸收(XAS)和发射(XES)光谱,以探索\({\ text {ZnO}} _ {{1-{\ text {x}}}的电子结构} \)化合物。对\({\ text {ZnO}} _ {{1-{\ text {x}}}} \)化合物的介电函数,吸收率,反射率,能量损失函数和光导谱进行了详细评估和分析。这项研究表明,在可见光范围内,光导率显着提高,因此\({\ text {ZnO}} _ {{1-{\ text {x}}}} \)化合物为实现光电探测器在可见光区域更敏感。

更新日期:2021-01-08
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