摘要
利用等离子辅助分子束外延(P-MBE)技术,在蓝宝石c-平面上外延生长了MgxZn1-xO(0≤x≤0·65)合金薄膜,其x值分别为0,0·11,0·28,0·44,0·51和0·65.X射线衍射测量表明,随着x增加到0·28,只在2θ为34·46～34·67°的位置观察到(002)衍射峰,表明样品为单一六角纤锌矿结构的MgZnO合金.当x值增加到0·44时,观察到了MgxZn1-xO的相分离.当x值增加到0·65时,MgZnO合金完成了从单一六角纤锌矿结构向立方向结构的转变.通过对样品的光致发光谱、吸收谱的测量,详细研究了上述样品的相结构转变对其光学性质的影响.
Mg, Zn1-x O thin films with x = 0,0. 11,0. 28,0. 44,0. 51,and 0.65 were grown on （0001） sapphire substrates with plasma-assisted molecular beam epitaxy. X-ray diffraction measurement reveals that there is only one Mg, Zn1-x O （002） peak at 34. 46-34.67° with increasing Mg content up to O. 28, indicating the formation of single-phase Mg, Zn1-x, O films with hexagonal crystal structure. When x rises to 0. 44, a phase separation of Mg, Zn1-x, O occurs. When x equals 0.65, the ZnMgO transforms completely from wurtzite to cubic structure. The effects of phase structure transition on optical properties of Mg, Zn1-x, O alloy films were investigated via room temperature photoluminescence and absorption spectra.
基金
国家自然科学基金资助项目~~
