| Project/Area Number |
60550002
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Applied materials
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| Research Institution | Hokkaido University |
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Principal Investigator |
TANAKA Keiji Hokkaido University, Faculty of Engineering, Associate prof., 工学部, 講師 (20002313)
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| Co-Investigator(Kenkyū-buntansha) |
UENO Tokihiro Hokkaido University, Faculty of Engineering, Associate Prof., 工学部, 助教授 (70001310)
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| Project Period (FY) |
1985 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1986: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1985: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | amorphous semiconductors / chalcogenide material / optical property / photodarkening phenomonon / amorphous structure / 圧縮率 |
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| Research Abstract |
A purpose of the present study is to obtain a unified picture of fundamental physical properties in chalcogenide amorphous semiconductors. The study is mainly based on experimental results of compositional and pressure-induced effects. Photoinduced phenomena are also investigated extensively. The results obtained through the present work can be summarized as follows.
First, new insights regarding the medium-range structural order have been confirmed. The structure, which can be inferred from the average coordination number Z of covalent bonding, changes from the one-dimensional chain structure to the three-dimensionally connected networks with an increase in Z from 2 to 4. Between these extrema, there exists the two-dimensional structure at around Z = 2.7.
Second, a quantitative description for the mechanism of the photodarkening phenomenon has been given. The origin is ascribed to photoinduced twisting motions of chalcogen atoms. Light-intensity dependence of the photodarkening is analysed, and it is predicted that the magnitude of the photodarkening can be enhanced to twice the commonly-observed value.
These two kinds of studies on the different aspects of chalcogenide glasses will be connected for investigating the photostructural transformations.
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