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First principles study of the structural, electronic and optical properties of ZnS_xSe_(1-x) alloys

机译:ZnS_xSe_(1-x)合金的结构,电子和光学性质的第一性原理研究

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The structural, electronic and optical properties of ZnS_xSe _(1-x) alloys have been investigated using density functional theory by Wien2k package. The exchange correlation potential is treated by the local density approximation (LDA), generalized gradient approximation (GGA), Engel-Vosko generalized gradient approximation (GGA-EV) and GGA-EV plus U (GGA-EV+U). The calculated real and imaginary parts of the dielectric function and the reflectivity of ZnS_xSe_(1-x) alloys are in good agreement with the available experimental results particularly in GGA-EV and GGA-EV+U. I have studied the effect of composition on the equilibrium volume, bulk modulus, energy band gap and the static dielectric constant and static reflectivity spectra. Furthermore the effect of hydrostatic pressure on the electronic and optical properties of these alloys has been investigated The first and second order pressure coefficient for the energy band gaps, the static dielectric function and the static reflectivity spectra have been calculated.
机译:ZnS_xSe _(1-x)合金的结构,电子和光学性质已经通过Wien2k封装使用密度泛函理论进行了研究。通过局部密度近似(LDA),广义梯度近似(GGA),Engel-Vosko广义梯度近似(GGA-EV)和GGA-EV加U(GGA-EV + U)处理交换相关势。 ZnS_xSe_(1-x)合金的介电函数的实部和虚部以及反射率的计算值与可用的实验结果非常吻合,尤其是在GGA-EV和GGA-EV + U中。我研究了组成对平衡体积,体积模量,能带隙以及静态介电常数和静态反射率光谱的影响。此外,还研究了静水压力对这些合金的电子和光学性能的影响。计算了能带隙,静态介电函数和静态反射光谱的一阶和二阶压力系数。

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