arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.10728cond-mat.mtrl-sci
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DFT研究稀土(Tm,Yb,Ce)掺杂的ZnO:结构、光电性能

DFT study of rare earth (Tm, Yb, Ce) doped ZnO: structural, optoelectronic and electrical properties

M. Khuili, N. Fazouan, H. Abou El Makarim, E. H. Atmani, D. P. Rai, M. Houmad

摘要:

采用基于全势线性缀加平面波轨道(FP-LAPW)方法的密度泛函理论(DFT),在Wien 2K程序中对稀土元素(Tm,Yb,Ce)掺杂的纤锌矿型ZnO进行了比较研究。用PBEsol泛函计算了体系的结构参数,与实验数据吻合较好.用TB-mBJ势确定了其电子(态密度、能带结构)和光学(吸收系数、反射率、折射率)性质。稀土元素掺杂对ZnO的光电性能有显著的影响,其主要原因是4f电子的存在。电子结构分析结果表明,Tm、Yb、Ce的掺杂使ZnO的禁带宽度增大,与实验结果定性一致。在许多情况下,费米能级已经移动到导带,揭示了n型字符。基于半经典玻尔兹曼方程,用BoltzTrap程序计算了电导率。已经观察到,电导率与温度和载流子浓度有直接关系。研究结果为今后Tm、Yb、Ce掺杂ZnO化合物作为集成光电子器件和太阳能电池的研究奠定了基础。

英文摘要:

A comparative study of wurtzite ZnO doped by rare earth elements (Tm, Yb, Ce) have been investigated using density functional theory (DFT) based on the full-potential linearized augmented plane wave orbital (FP-LAPW) method, as implemented in Wien2K code. The structural parameters were calculated by PBEsol functional and in good agreement with the experimental data. The electronic (density of states, band structure) and optical (absorption coefficient, reflectivity, refraction index) properties were determined by TB-mBJ potential. The rare earth element doped ZnO have a significant impact on the optoelectronic properties which are mainly arise due to the presence of 4f electrons. The results of electronic structure shows that the doping of Tm, Yb, Ce on pristine ZnO has increases the band gap and in qualitative agreement with the experimental results. In many cases the Fermi level has been shifted to the conduction band, revealing n-type characters. Electrical conductivity has been calculated using BoltzTrap code based on the semiclassical equation of Boltzmann. It has been observed that the conductivity has a direct relation with the temperature and carriers concentration. Our results provide the basis for future research in Tm, Yb, Ce doped ZnO compounds used as integrated optoelectronic devices and solar cells.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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