期刊
JOURNAL OF APPLIED PHYSICS
卷 107, 期 3, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3298457
关键词
etching; molecular dynamics method; nanopatterning; nanowires; silicon; surface roughness; thermal conductivity; thermoelectric conversion
资金
- National Science Foundation (NSF) [CMMI-0643726]
- Ministry of Education, Science and Technology of Korea [R32-2008-000-20042-0]
- National Natural Science Foundation of China [50928601]
- American Academy of Mechanics
- Robert M. and Mary Haythornthwaite Foundation
Reducing the thermal conductivity of nanowires may enhance their already exciting efficiency of thermoelectric energy conversion. Using molecular dynamics simulations, we demonstrate that the thermal conductivity of silicon nanowires could be significantly decreased by patterning (or etching) induced roughness of the nanowire surfaces. The type, amplitude, and wavelength of the surface roughness all have profound effects, and the thermal conductivity could be reduced more when the wavelength is smaller or the amplitude is larger. Such an effect of roughness on the thermal conductivity is furthermore found to be coupled with the effects of nanowire cross-sectional size and length. Typically, the roughness effect is more prominent in longer and larger nanowires.
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