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采用电化学腐蚀的方法制备了不同孔径的多孔硅薄膜样品,并在1050℃高温下进行了退火.采用扫描电镜和拉曼光谱对多孔硅退火前后结构的变化进行了观察,根据晶体形核理论分析了孔径变化的机理,并从热力学角度对其微观机制进行了讨论.实验和理论分析的结果均表明,多孔硅的初始孔径存在一个临界值,初始孔径小于此临界值时,孔在高温退火中有收缩的趋势;反之,初始孔径大于此临界值时,孔有变大的趋势.

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