| Project/Area Number |
20760494
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Material processing/treatments
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| Research Institution | Shimane University |
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Principal Investigator |
KITAGAWA Hiroyuki Shimane University, 総合理工学部, 准教授 (00325044)
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| Project Period (FY) |
2008 – 2009
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| Project Status |
Completed (Fiscal Year 2009)
|
| Budget Amount *help |
¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2009: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2008: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | 熱電変換材料 / 液相成長法 / キャリア輸送特性 / ビスマステルライド / 結晶成長 |
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| Research Abstract |
A liquid-phase growth process of Bi_2Te_3-based materials was developed in order to obtain polycrystals with a preferred orientation for use in thermoelectric applications. The liquid-phase growth was carried out under an argon atmosphere by using the sliding-boat method, which is an easy and short-time process compared with the conventional method for preparing the single crystals. X-ray diffraction patterns show that the hexagonal c-plane of the grown crystal is almost parallel to the substrate. The Hall mobility of the grown crystal (p-type Bi_<0.5>Sb_<1.5>Te_3) was 1.8～2 times larger than that of the sintered materials with a comparable carrier concentration. As a result, the thermoelectric power factor was improved by this process because of the low electrical resistivity due to the high carrier mobility.
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