用等离子辅助分子束外延(P-MBE)的方法,在蓝宝石c-平面上外延生长了MgxZn1-xO合金薄膜.在0≤x≤0.2范围内MgxZn1-xO薄膜保持着六角纤锌矿结构不变.原位反射式高能电子衍射图样和X射线双晶衍射谱的结果表明生长的样品是单晶薄膜.随着x值逐渐增大,Mg2+离子逐渐进入ZnO的晶格,X射线双晶衍射测得样品的(002)取向的半高宽度从0.249°增加到0.708°,表明结晶质量逐渐下降,(002)方向的X射线衍射峰向大角度方向移动,晶格常数c由5.205(A)减小到5.185(A).透射光谱的结果表明,合金薄膜的吸收边随着Mg离子的掺入逐渐向高能侧移动,室温光致发光谱出现很强的紫外发光(NBE)峰,没有观察到深能级(DL)发射,且随着Mg掺入量的增加,紫外发光峰有明显的蓝移,这与透射光谱的结果是相吻合的.
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