Structural Changes of S–rich Ge–S Amorphous Film Compared with Bulk Glass☆
Structural Changes of S–rich Ge–S Amorphous Film Compared with Bulk Glass☆
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DOI：
10.1016/j.phpro.2013.07.026
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
R. Pan;H. Tao;X. M. Dong;Changgui Lin;Xiufeng Zhao
中科院分区：
文献类型：
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作者：
R. Pan;H. Tao;X. M. Dong;Changgui Lin;Xiufeng Zhao
采用传统的熔融淬火法和脉冲激光沉积法制备了GeS 6非晶块体玻璃和薄膜。测量了样品的透射光谱、吸收光谱和拉曼光谱。短波吸收边用Tauc提出的“非直接跃迁”模型描述。由吸收光谱计算了玻璃和薄膜的光学带隙。结果表明，GeS 6薄膜的光学带隙比体玻璃的光学带隙大。采用拉曼光谱对玻璃和薄膜的结构单元进行了表征。在GeS_6玻璃和GeS_6薄膜中，除了GeS_4/2四面体的共边和共角基本结构单元外，还存在S-S同极键。而GeS_6块体玻璃中存在较多的S_8环。通过拉曼光谱分析，讨论了GeS_6薄膜较大的光学带隙与薄膜结构的关系。
Amorphous GeS6 bulk glass and film were prepared by the traditional melt–quenching method and pulsed laser deposition technique. The optical transmission spectra, absorption spectra and Raman spectra were measured. The short- wave absorption edges were described using the ‘non–direct transition’ model proposed by Tauc. And the optical band gaps of the bulk glass and film were derived from the absorption spectra. The results show that GeS6 film has bigger optical band gap than that of bulk glass. The structural units of the bulk glass and film were characterized using Raman spectroscopy. In addition to the basic structural units of edge-sharing and corner-sharing GeS4/2 tetrahedra, there are S–S homo–polar bonds in both GeS6 bulk glass and GeS6 film. While more S8 rings exist in GeS6 bulk glass. The bigger optical band gap of the GeS6 film was discussed in relation to the structure of the film confirmed by the Raman spectra analysis.