| Co-Investigator(Kenkyū-buntansha) |
MATSUDA Osamu Graduate School of Science, Hokkaido Univ. Associate Prof., 大学院・工学研究科, 助教授 (30239024)
INOUE Koichi Graduate School of Science, Osaka Univ. Associate Prof., 産業科学研究所, 助教授 (50159977)
WANG Yong Graduate School of Science, Osaka Univ. Research Associate, 理学研究科, 助手 (30294143)
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| Research Abstract |
We have presented a comprehensive study of the roles of nanoscopic structural units in chalcogenide glasses in relaxation behaviors around glass transition temperature, structural changes toward crystallization, electronic structures around band-tails, and relaxation processes of photoexcited carriers.
First, we have shown that the variation of Se_n (n>2) chain segments essentially determines relaxational behaviors of networks. We have also shown that the compositional dependence of resonant Raman spectra is explained by the variation in lengths of the Se_n chain and the CST chain. Second, we have found that intrinsic inhomogeneity in Ge-Ge ethan-like units, Se-Se bonds, and fragments similar to β-GeSe_2 can cause significantly different macroscopic structural changes in GeSe_2 glass. Finally, we have demonstrated that threefold-coordinated Se atoms forming Se-Se bonds play a key role in the photoinduced structural change and the dynamics of photoexcited carriers in GeSe_2 glass.
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