采用分子束外延技术,利用RHEED图像可研究GaAs表面重构方式和生长机制.报道了一种新型的分子束外延方法,在RHEED实时监控下,利用GaAs(001)基片同质外延GaAs.通过改变生长和退火的时间与温度(420、500、580℃),结合RHEED图像演变与GaAs表面平整度(粗糙化)的联系,得到表面原子级平整的GaAs样品.完成生长后对样品做EDS分析,确定样品为高纯度GaAs.利用这种方法,得到厚度约为4μm砷化镓晶体.
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