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NTIS 바로가기大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. B. B, v.40 no.9 = no.372, 2016년, pp.621 - 627
In this study, we present a model that can be used to calculate the phonon-surface scattering rate directly from the experimental data on phonon mean free path (MFP) spectra of nanostructures. Using this model and the recently reported length-dependent thermal conductivity measurements on
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핵심어 | 질문 | 논문에서 추출한 답변 |
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나노제작기술의 발달로 인하여 가능해진 것은? | 포논(phonon)은 반도체 및 절연체(dielectric) 내의 결정체(crystal) 격자(lattice)의 열을 전달하는 양자화된 진동인데,(1,2) 포논 전달특성 연구는 고효율의 나노시스템 개발에 있어서 매우 중요하다.(1~4) 특히, 최근 나노제작기술(nano-fabrication technology) 의 발달에 힘입어 시스템 특성길이가수에서 수십 nm에 이르는 점(dot), 선(wire), 박막(thin film) 등 다양한 형태의 나노재료의 제작이 가능해졌다.(4) | |
열전 소자의 효율 향상을 위하여, 큰 전기 전도율을 갖는 동시에 낮은 열전도율을 가지는 재료 개발 연구하는 근거는? | (1,2) 나노제작기술 응용분야의 하나로, 폐열(waste heat) 을 활용하여 전기를 생산할 수 있는 열전(thermoelectrics) 소자가 있다.(1~4) 열전 소자의 효율을 의미하는 열전성능지수(thermoelectric figure of merit, ZT)는 ZT =σS2T/(Kph + Ke)로 정의되며, 전자의 열전 도율(Ke)은 전기전도율(σ)에 비례하므로, ZT 향상은 일반적으로 포논의 열전도율(Kph) 축소에 의지한다.(1,4) 따라서 열전 소자의 효율 향상을 위하여, 큰 전기 전도율을 갖는 동시에 낮은 열전도율을 가지는 재료 개발 연구가 활발히 진행되고 있다. | |
포논이란? | 포논(phonon)은 반도체 및 절연체(dielectric) 내의 결정체(crystal) 격자(lattice)의 열을 전달하는 양자화된 진동인데,(1,2) 포논 전달특성 연구는 고효율의 나노시스템 개발에 있어서 매우 중요하다.(1~4) 특히, 최근 나노제작기술(nano-fabrication technology) 의 발달에 힘입어 시스템 특성길이가수에서 수십 nm에 이르는 점(dot), 선(wire), 박막(thin film) 등 다양한 형태의 나노재료의 제작이 가능해졌다. |
Tien, C. L., Majumdar, A. and Gerner, F. M., 1998, MICROSCALE ENERGY TRANSPORT, Taylor & Francis, Washington D. C., pp. 3-94.
Zhang, Z. M., 2007, Nano/Microscale Heat Transfer, Mc Graw Hill, New York, pp. 162-182.
Kim, W., Zide, J., Gossard, A., Klenov, D., Stemmer, S., Shakouri, A. and Majumdar, A, 2006, "Thermal Conductivity Reduction and Thermoelectric Figure of Merit Increase by Embedding Nanoparticles in Crystalline Semiconductors," Physical Review Letters, Vol. 96, No. 4, Paper Number 045901.
Kim, W., 2015, "Strategies for Engineering Phonon Transport in Thermoelectrics," Journal of Materials Chemistry C, Vol. 3, No. 10, pp. 10336-10348.
Li, D., Wu, Y., Kim, P., Shi, L., Yang, P. and Majumdar, A., 2003, "Thermal Conductivity of Individual Silicon Nanowires," Applied Physics Letters, Vol. 83, No. 14, pp. 2934-2936.
Hochbaum, A. I., Chen, R., Delgado, R. D., Liang, W., Garnett, E. C., Najarian, M., Majumdar, A. and Yang, P., 2008, "Enhanced Thermoelectric Performance of Rough Silicon Nanowires," Nature, Vol. 451, No. 7175, pp. 163-167.
Zou, J. and Balandin, A., 2001, "Phonon Heat Conduction in a Semiconductor Nanowire," Journal of Applied Physics, Vol. 89, No. 5, pp. 2932-2938.
Lim, J., Hippalgaonkar, K., Andrews, S. C., Majumdar, A. and Yang, P., 2012, "Quantifying Surface Roughness Effects on Phonon Transport in Silicon Nanowires," Nano Letters, Vol. 12, No. 5, pp. 2475-2482.
Chen, R., Hochbaum, A. I., Murphy, P., Moore, J., Yang, P. and Majumdar, A, 2008, "Thermal Conductance of Thin Silicon Nanowires," Physical Review Letters, Vol. 101, No. 10, Paper Number 105501.
Ghossoub, M. G., Valavala, K. V., Seong, M., Azeredo, B., Hsu, K., Sadhu, J. S., Singh, P. K. and Sinha, S., 2013, "Spectral Phonon Scattering from Sub-10 nm Surface Roughness Wavelengths in Metal-Assisted Chemically Etched Si Nanowires," Nano Letters, Vol. 13, No. 4, pp. 1564-1571.
Hertzberg, J. B., Aksit, M., Otelaja, O. O., Stewart, D. A. and Robinson, R. D., 2014, "Direct Measurements of Surface Scattering in Si Nanosheets Using a Microscale Phonon Spectrometer: Implications for Casimir-Limit Predicted by Ziman Theory," Nano Letters, Vol. 14, No. 2, pp. 409-415.
Zhou, Y., Chen, Y. and Hu, M., 2016, "Strong Surface Orientation Dependent Thermal Transport in Si Nanowires," Scientific Report, Vol. 6, Paper Number 24903.
Zianni, X. and Chantrenne, P., 2013, "Thermal Conductivity of Diameter-Modulated Silicon Nanowires Within a Frequency-Dependent Model for Phonon Boundary Scattering," Journal of Electronic Materials, Vol. 42, No. 7, pp. 1509-1513.
Xie, G., Guo, Y., Li, B., Yang, L., Zhang, K., Tang, M. and Zhang, G., 2013, "Phonon Surface Scattering Controlled Length Dependence of Thermal Conductivity of Silicon Nanowires," Physical Chemistry Chemical Physics, Vol. 15, No. 35, pp. 14647-14652.
Marchbanks, C. and Wu, Z., 2015, "Reduction of Heat Capacity and Phonon Group Velocity in Silicon Nanowires," Journal of Applied Physics, Vol. 117, No. 8, Paper Number 084305.
Sadhu, J. and Sinha, S., 2011, "Room-temperature Phonon Boundary Scattering Below the Casimir Limit," Physical Review B, Vol. 84, No. 11, Paper Number 115450.
Feser, J. P., Sadhu, J. S., Azeredo, B. P., Hsu, K. H., Ma, J., Kim, J., Seong, M., Fang, N. X., Li, X., Ferreira, P. M., Sinha, S. and Cahill, D. G., 2012, "Thermal Conductivity of Silicon Nanowire Arrays with Controlled Roughness," Journal of Applied Physics, Vol. 112, No. 11, Paper Number 114306.
Hsiao, T.-K., Chang, H.-K., Liou, S.-C., Chu, M.-W., Lee, S.-C. and Chang, C.-W., 2013, "Observation of Room Temperature Ballistic Thermal Conduction Persisting over 8.3 ${\mu}m$ in SiGe Nanowires," Nature Nanotechnology, Vol. 8, No. 7, pp. 534-538.
Malhotra, A. and Maldovan, M., 2016, "Impact of Phonon Surface Scattering on Thermal Energy Distribution of Si and SiGe Nanowires," Scientific Report, Vol. 6, Paper Number 25818.
Xie, G., Guo, Y., Wei, X., Zhang, K., Sun, L., Zhong, J., Zhang, G. and Zhang, Y.-W., 2014, "Phonon Mean Free Path Spectrum and Thermal Conductivity for $Si_{1-x}Ge_x$ Nanowires," Applied Physics Letters, Vol. 104, No. 23, Paper Number 233901.
Yin, L., Lee, E. K., Lee, J. W., Whang, D., Choi, B. L. and Yu, C., 2012, "The Influence of Phonon Scatterings on the Thermal Conductivity of SiGe Nanowires," Applied Physics Letters, Vol. 101, No. 4, Paper Number 043114.
Zhang, H., Hua, C., Ding D. and Minnich, A. J., 2015, "Length Dependent Thermal Conductivity Measurements Yield Phonon Mean Free Path Spectra in Nanostructures," Scientific Report, Vol. 5, Paper Number 9121.
Narumanchi, S. V. J., Murthy, J. Y. and Amon, C. H., 2004, "Submicron Heat Transfer Model in Silicon Accounting for Phonon Dispersion and Polarization," ASME Journal of Heat Transfer, Vol. 126, No. 6, pp. 946-955.
Narumanchi, S. V. J., Murthy, J. Y. and Amon, C. H., 2005, "Comparison of Different Phonon Transport Models for Predicting Heat Conduction in Silicon-oninsulator Transistors," ASME Journal of Heat Transfer, Vol. 127, No. 7, pp. 713-723.
Lee, J., Lim, J. and Yang, P., 2015, "Ballistic Phonon Transport in Holey Silicon," Nano Letters, Vol. 5, No. 5, pp. 3273-3279.
Minnich, A. J., 2015, "Thermal Phonon Boundary Scattering in Anisotropic Thin Films," Applied Physics Letters, Vol. 107, No. 18, Paper Number 183106.
Sellan, D. P., Turney, J. E., McGaughey, A. J. H. and Amon, C. H., 2010, "Cross-plane Phonon Transport in Thin Films," Journal of Applied Physics, Vol. 108, No. 11, Paper Number 113524.
Brockhouse, B. N., 1959, "Lattice Vibrations in Silicon and Germanium," Physical Review Letters, Vol. 2, No. 6, pp. 256-258.
Majumdar, A., 1993, ''Microscale Heat Conduction in Dielectric Thin Films,'' ASME Journal of Heat Transfer, Vol. 115, No. 7, pp. 7-16.
Jain, A., Yu, Y.-J. and McGaughey, A. J. H., 2013, "Phonon Transport in Periodic Silicon Nanoporous Films with Feature Sizes Greater Than 100 nm," Physical Review B, Vol. 87, No. 19, Paper Number 195301.
Minnich, A. J., Johnson, J. A., Schmidt, A. J., Esfarjani, K., Dresselhaus, M. S., Nelson, K. A. and Chen, G., 2011, "Thermal Conductivity Spectroscopy Technique to Measure Phonon Mean Free Paths," Physical Review Letters, Vol. 107, No. 9, Paper Number 095901.
Minnich, A. J., 2012, "Determining Phonon Mean Free Paths from Observations of Quasiballistic Thermal Transport," Physical Review Letters, Vol. 109, No. 20, Paper Number 205901.
Esfarjani, K. and Chen, G., 2011, "Heat Transport in Silicon from First-principles Calculations," Physical Review B, Vol. 84, No. 8, Paper Number 085204.
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