Abstract
The electronic structures and optical properties of B3 ZnO series of Zn4X4-yMy(X =O, S, Se or Te; M = N, Sb, Cl or I; y = 0 or 1) are studied by first-principles calculations using a pseudopotential plane-wave method. The results show that Zn d-X p orbital interactions play an important role in the p-type doping tendency in zinc-based II-VI semiconductors. In ZnX, with increasing atomic number of X, Zn d-X p orbital interactions decrease and Zn s-X p orbital interactions increase. Additionally, substituting group-V elements for X will reduce the Zn d-X p orbital interactions while substituting group-VII elements for X will increase the Zn d-X p orbital interactions. The results also show that group-V-doped ZnX and group-VII-doped ZnX exhibit different optical behaviours due to their different orbital interaction effects.
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