Photoinduced Surface Deposition Phenomenon of Chalcogenide Amorphous Films Containing a large Amount of Silver (Studies of Nucleation and Growth Process)

获得了从1999年到2000年两年的形核和生长过程的基本数据。本实验中使用的样品是Ag_x(Ge_&lt；0.3&gt；S_&lt；0.7&gt；)_&lt；100-x&gt；(55≦x≦67)系统中的薄膜和Ag_xAs_&lt；15&gt；S_&lt；40-x&gt；(35≦x≦45)系统中的大块玻璃。低银含量的大块玻璃中银含量较少，但银颗粒密度较高。相反，高银含量的大块玻璃中的银含量较高，但银颗粒密度较小，尺寸较大。另一方面，低Ag含量的薄膜样品有少量的Ag偏析，而Ag含量较高的样品则有大量的Ag偏析。银颗粒的数量与银的浓度没有明显的关系。银的浓度影响银颗粒的大小。实际上，照明区由于银浓度较高(x=65~67)而被致密的银层覆盖，就像是一层连续的银膜。前Wa…核的加入越是S发现，有效地增加了银颗粒的数量。少量Au的加入对银砷S大块玻璃是非常有效的。Au~(++)离子注入对Ag-As-S大块玻璃也是有效的。发现在光学照射前的电子束照射可以产生高密度的银核。2001年，我们研究了大块玻璃和薄膜样品的晶体生长机制的差异。晶体的生长强烈依赖于银的浓度，而与玻璃和薄膜样品无关。综上所述，对于光诱导表面沉积现象中银颗粒的成核和生长过程，可以提出如下模型。样品表面的一些成核位可能有助于银的沉积。对于大块玻璃，低银浓度时SITS数目较多，且随银浓度增加而减少。这似乎是由于玻璃结构造成的。对于薄膜样品，由于高Ag含量的薄膜样品中出现了大量的Ag颗粒，因此薄膜表面的位置可能与薄膜的表面粗糙度和结构有关。薄膜的表面粗糙度和结构都可能比大块玻璃的表面粗糙度大。Au金属的加入可能会在玻璃和薄膜中形成Au团簇，Au团簇可能是Ag沉积过程的形核中心。Au团簇对大块玻璃的影响比薄膜样品显著，大块玻璃的原始位置比薄膜样品少得多。较少

The Basic data of the nucleation and growth process were obtained for 2 years from 1999 to 2000. The samples used in this experiment were the bulk glasses in the system of Ag_xAs_<15>S_<40-x> (35≦x≦45) and the films in the system of Ag_x(Ge_<0.3>S_<0.7>)_<100-x> (55≦x≦67). The bulk glass with low Ag concentration shows small amount of segregated Ag but high density Ag particles. In contrast, the bulk glass with high Ag concentration shows large amount of segregated Ag but small density Ag particles with large size. On the other hand, the film samples with low Ag concentration shows small amount of segregated Ag and the samples with large Ag concentration shows large amount of segregated Ag. The number of Ag particles does not depend significantly on the Ag concentration. The Ag concentration affects the size of Ag particles. In fact, the illuminated area is densely covered with Ag deposits for high Ag concentration (x=65〜67), as if a continuous Ag film.The addition of nucleus former wa … More s found to be effective to increase the number of Ag particles. The addition of a small amount of Au metal is highly effective for the Ag-As-S bulk glasses. The implantation of Au^+ ions was also effective for the Ag-As-S bulk glasses. The electron beam irradiation before optical illumination was found to create high density Ag nucleus. In 2001, we have researched difference of the crystal growth mechanism between the bulk glasses and film samples. The crystal growth depends strongly depends on the Ag concentration, irrespective of the bulk glass and film sample.In summary, the following model may be proposed for the nucleation and growth process of Ag particles in the Photoinduced surface deposition phenomenon. Some nucleation site on the sample surface may assist the Ag deposition. In the case of bulk glasses, the number of sits is large for low Ag concentration and decreases with increasing the Ag concentration. This seems to be due to the glass structure. For the film sample, the site may be concerned with both surface roughness and structure of the films, since many Ag particles appear for the film samples with high Ag concentration. Both surface roughness and structure for the films may be large than for the bulk glasses. The addition of Au metal may produce the Au clusters in the glass and film and the Au cluster may act as a nucleation center of the Ag deposition process. The effect of Au cluster is significant for the bulk glass than for the film sample, the number of original site of the bulk glass is much less than the film sample. Less