Tuning the Anisotropic Thermal Transport in {110}-Silicon Membranes with Surface Resonances
Understanding the thermal transport in nanostructures has important applications in fields such as thermoelectric energy conversion, novel computing and heat dissipation. Using non-homogeneous equilibrium molecular dynamic simulations, we studied the thermal transport in pristine and resonant Si mem...
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MDPI AG
2021-12-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/12/1/123 |
| _version_ | 1797498114089680896 |
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| author | Keqiang Li Yajuan Cheng Maofeng Dou Wang Zeng Sebastian Volz Shiyun Xiong |
| author_facet | Keqiang Li Yajuan Cheng Maofeng Dou Wang Zeng Sebastian Volz Shiyun Xiong |
| author_sort | Keqiang Li |
| collection | DOAJ |
| description | Understanding the thermal transport in nanostructures has important applications in fields such as thermoelectric energy conversion, novel computing and heat dissipation. Using non-homogeneous equilibrium molecular dynamic simulations, we studied the thermal transport in pristine and resonant Si membranes bounded with {110} facets. The break of symmetry by surfaces led to the anisotropic thermal transport with the thermal conductivity along the [110]-direction to be 1.78 times larger than that along the [100]-direction in the pristine structure. In the pristine membranes, the mean free path of phonons along both the [100]- and [110]-directions could reach up to ∼100 µm. Such modes with ultra-long MFP could be effectively hindered by surface resonant pillars. As a result, the thermal conductivity was significantly reduced in resonant structures, with 87.0% and 80.8% reductions along the [110]- and [100]-directions, respectively. The thermal transport anisotropy was also reduced, with the ratio <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>κ</mi><mn>110</mn></msub><mo>/</mo><msub><mi>κ</mi><mn>100</mn></msub></mrow></semantics></math></inline-formula> decreasing to 1.23. For both the pristine and resonant membranes, the thermal transport was mainly conducted by the in-plane modes. The current work could provide further insights in understanding the thermal transport in thin membranes and resonant structures. |
| first_indexed | 2024-03-10T03:28:51Z |
| format | Article |
| id | doaj.art-4c7d39cf07494bab8b32094e63f51534 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T03:28:51Z |
| publishDate | 2021-12-01 |
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| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-4c7d39cf07494bab8b32094e63f515342023-11-23T12:01:51ZengMDPI AGNanomaterials2079-49912021-12-0112112310.3390/nano12010123Tuning the Anisotropic Thermal Transport in {110}-Silicon Membranes with Surface ResonancesKeqiang Li0Yajuan Cheng1Maofeng Dou2Wang Zeng3Sebastian Volz4Shiyun Xiong5Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices, School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, ChinaSchool of Physics and Materials Science, Guangzhou University, Guangzhou 510006, ChinaInstitute of Advanced Semiconductors, Hangzhou Innovation Center, Zhejiang University, Hangzhou 311200, ChinaHebei Shenke Magnetic Material Co., Ltd., 9 FuDong Industrial Zone, ShiFu Avenue, Xinji 052300, ChinaLaboratory for Integrated Micro Mechatronic Systems (LIMMS/CNRS-IIS), The University of Tokyo, Tokyo 153-8505, JapanGuangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices, School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, ChinaUnderstanding the thermal transport in nanostructures has important applications in fields such as thermoelectric energy conversion, novel computing and heat dissipation. Using non-homogeneous equilibrium molecular dynamic simulations, we studied the thermal transport in pristine and resonant Si membranes bounded with {110} facets. The break of symmetry by surfaces led to the anisotropic thermal transport with the thermal conductivity along the [110]-direction to be 1.78 times larger than that along the [100]-direction in the pristine structure. In the pristine membranes, the mean free path of phonons along both the [100]- and [110]-directions could reach up to ∼100 µm. Such modes with ultra-long MFP could be effectively hindered by surface resonant pillars. As a result, the thermal conductivity was significantly reduced in resonant structures, with 87.0% and 80.8% reductions along the [110]- and [100]-directions, respectively. The thermal transport anisotropy was also reduced, with the ratio <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>κ</mi><mn>110</mn></msub><mo>/</mo><msub><mi>κ</mi><mn>100</mn></msub></mrow></semantics></math></inline-formula> decreasing to 1.23. For both the pristine and resonant membranes, the thermal transport was mainly conducted by the in-plane modes. The current work could provide further insights in understanding the thermal transport in thin membranes and resonant structures.https://www.mdpi.com/2079-4991/12/1/123phonon resonanceanisotropic transportmolecular dynamicsthermal conductivity |
| spellingShingle | Keqiang Li Yajuan Cheng Maofeng Dou Wang Zeng Sebastian Volz Shiyun Xiong Tuning the Anisotropic Thermal Transport in {110}-Silicon Membranes with Surface Resonances Nanomaterials phonon resonance anisotropic transport molecular dynamics thermal conductivity |
| title | Tuning the Anisotropic Thermal Transport in {110}-Silicon Membranes with Surface Resonances |
| title_full | Tuning the Anisotropic Thermal Transport in {110}-Silicon Membranes with Surface Resonances |
| title_fullStr | Tuning the Anisotropic Thermal Transport in {110}-Silicon Membranes with Surface Resonances |
| title_full_unstemmed | Tuning the Anisotropic Thermal Transport in {110}-Silicon Membranes with Surface Resonances |
| title_short | Tuning the Anisotropic Thermal Transport in {110}-Silicon Membranes with Surface Resonances |
| title_sort | tuning the anisotropic thermal transport in 110 silicon membranes with surface resonances |
| topic | phonon resonance anisotropic transport molecular dynamics thermal conductivity |
| url | https://www.mdpi.com/2079-4991/12/1/123 |
| work_keys_str_mv | AT keqiangli tuningtheanisotropicthermaltransportin110siliconmembraneswithsurfaceresonances AT yajuancheng tuningtheanisotropicthermaltransportin110siliconmembraneswithsurfaceresonances AT maofengdou tuningtheanisotropicthermaltransportin110siliconmembraneswithsurfaceresonances AT wangzeng tuningtheanisotropicthermaltransportin110siliconmembraneswithsurfaceresonances AT sebastianvolz tuningtheanisotropicthermaltransportin110siliconmembraneswithsurfaceresonances AT shiyunxiong tuningtheanisotropicthermaltransportin110siliconmembraneswithsurfaceresonances |