2013 Fiscal Year Final Research Report
Research on Si based thermoelectric material by nanostructuring
| Project/Area Number |
24656576
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Energy engineering
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Keywords | ナノ伝熱 / フォノニクス / フォノニック結晶 / 廃熱利用 |
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| Research Abstract |
The objective of this research is investigation of the possibility of enhancement of the thermoelectric conversion efficiency of nanostructured Si, which has low environmental load. The key is control of phonon transport, which results in higher performance by reducing the thermal conductivity.
We challenged the artificial control of thermal conductivity on the basis of phononics. Formation technology of as small as 100-nm-period air-suspended Si nanostructure has been developed. A high through put and reliable time-domain micro thermoreflectance system for thermal conductivity measurements for micro/nano structures has been developed. We have succeeded in observing a characteristic ballistic phonon transport at room temperature in nanostructures and clear reduction in thermal conductivity in phononic crystal nanostructures compared with those in nanowires. This result shows that this structure is useful for thermal conduction engineering.
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