INVESTIGATION OF RIGIDITY PERCOLATION, MEDIUM-RANGE STRUCTURES AND FRACTON IN MULTI-COMPOUND GLASSY SEMICONDUCTORS

多化合物玻璃半导体中的刚性渗流、中程结构和分形研究

• 批准号: 09440117
• 负责人: MURASE Kazuo
• 金额: $ 8.19万
• 依托单位: OSAKA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-09440117/
• 关键词: Chalcogenide; Raman scattering; low frequency; Rigidity percolation; Self-organization; Nano-separation; Localized phonon; non equilibrium; カルコゲナイド; ラマン散乱; フラジリティ; フラクトン; フォトルミネッセンス; ガラス転移; 共有結合ガラス; フォノン; 平均配位数; リジディティ・パーコレーション; リジディティーパ

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.

本文研究了硫系玻璃中纳米结构单元在玻璃化转变温度附近的弛豫行为、晶化过程中的结构变化、带尾附近的电子结构以及光激发载流子的弛豫过程中的作用.我们还指出，用Se_n链和CST链长度的变化解释了共振拉曼光谱的组成依赖性。第二，我们发现Ge-Ge类乙烷基元、Se-Se键和类似β-GeSe_2的碎片的内在不均匀性可以导致GeSe_2玻璃中明显不同的宏观结构变化。最后，我们证明了三配位的Se原子形成Se-Se键在GeSe_2玻璃的光致结构变化和光激发载流子动力学中起着关键作用。

项目成果

Yong Wang: "Effect of thermal annealing on dynamics of photoluminescence in a-GeSe_2 films"Journal of Non-Crystalline Solids. 266-269. 904-907 (2000)

王勇：“热退火对a-GeSe_2薄膜光致发光动力学的影响”非晶固体杂志。

Y.Wang, O.Matsuda, K.Inoue, and K.Murase: "Photo-induced crystallization in amorphous GeSe_2 studied by Raman scattering"Journal of Non-Crystalline Solids. vol.227-230. 728-731 (1998)

Y.Wang、O.Matsuda、K.Inoue 和 K.Murase：“通过拉曼散射研究非晶 GeSe_2 中的光致结晶”非晶固体杂志。

O.Matsuda, Y.Saitoh, K.Yamagata, Y.Wada, Y.Wang, K.Inoue, and K.Murase: "Relaxation process of photo-excited states in GeSe_2 glass investigated by time-resolved photoluminescence measurement"Journal of Non-Crystalline Solids. vol.227-230. 829-832 (1998)

O.Matsuda、Y.Saitoh、K.Yamagata、Y.Wada、Y.Wang、K.Inoue 和 K.Murase：“通过时间分辨光致发光测量研究 GeSe_2 玻璃中光激发态的弛豫过程”Journal of

K.Murase: "Insulating and Semiconductuing Glasses"World Scientific Press,Ltd,(Editor P.Boolchand) (in press).

K.Murase：“绝缘和半导体玻璃”世界科学出版社有限公司，（P.Boolchand 编辑）（正在印刷中）。

Y.Wang: "Rigidity percolation and structure of Ge-Se system" Physica B:Condensed Matter. 263-264. 313-316 (1999)

Y.Wang：“Ge-Se体系的刚性渗透和结构”物理学B：凝聚态物质。