应变超晶格(ZnS)1/(ZnSe)1的光学性质

用linear mufin tin orbital能带方法，计算Si衬底上（ZnS）_n/（ZnSe）_n（001）超晶格的能带结构，计算中采用外加调整势进行带隙修正．在得到较准确的能带结构和波函数的基础上，计算该超晶格系统的光学介电函数虚部ε₂（ω）．结果表明，该超晶格系统的光学性质结合了ZnS和ZnSe体材料光学性质的特点，在相当宽的能量范围内有较好的光谱响应．并且该超晶格系统是直接带隙材料，在光电器件应用中有很大潜力． 关键词：

THE OPTICAL PROPERTIES OF STRAINED SUPERLATTICE (ZnS)1/(ZnSe)1(001)

The linear muffin tin orbitals method was adopted to calculate the band structures of the strained- superlattice (ZnS)₁/(ZnSe)₁(001) grown on the Si substrate.In our calculation the external adjusted potential was used to overcome the problem of too small a band gap in it.On the basis of relatively accurately calculated band structure and wave function for this system,we calculated the imaginary part of dieletric function of the superlattice system.The results showed that the optical properties of (ZnS)₁/(ZnSe)₁(001) grown on the Si substrate consisted of the optical properties of bulk ZnS and of bulk ZnSe,and they have rather good optical response over a wide range of photon energy;futhermore,the superlattices are direct band gap materials.Thus the superlattices will become the promising materials for optoelectronic device applications.