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| Main Authors: | , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2507.02658 |
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| _version_ | 1866908432044392448 |
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| author | Nguyen, Thanh Fu, Chuliang Cheng, Mouyang Li, Buxuan Espedal, Tyra E. Chen, Zhantao Qiao, Kuan Neeraj, Kumar Chotrattanapituk, Abhijatmedhi Carrizales, Denisse Cordova Rha, Eunbi Liu, Tongtong Kajale, Shivam N. Sarkar, Deblina Walko, Donald A. Wen, Haidan Boriskina, Svetlana V. Chen, Gang Kim, Jeehwan Li, Mingda |
| author_facet | Nguyen, Thanh Fu, Chuliang Cheng, Mouyang Li, Buxuan Espedal, Tyra E. Chen, Zhantao Qiao, Kuan Neeraj, Kumar Chotrattanapituk, Abhijatmedhi Carrizales, Denisse Cordova Rha, Eunbi Liu, Tongtong Kajale, Shivam N. Sarkar, Deblina Walko, Donald A. Wen, Haidan Boriskina, Svetlana V. Chen, Gang Kim, Jeehwan Li, Mingda |
| contents | Efficient thermal management is essential for the reliability of modern power electronics, where increasing device density leads to severe heat dissipation challenges. However, in thin-film systems, thermal transport is often compromised by interfacial resistance and microscale defects introduced during synthesis or transfer, which are difficult to characterize using conventional techniques. Here we present a non-contact, spatiotemporal-resolved ultrafast x-ray diffraction method to extract in-plane thermal conductivity and thermal boundary conductance, using GaN thin films on silicon as a model system. By tracking the pump-induced lattice strain, we reconstruct the lateral heat flow dynamics and quantitatively probe thermal transport near a wrinkle defect. We uncover pronounced asymmetric heat dissipation across the wrinkle, with a four-fold reduction in the local thermal conductivity near the wrinkle and a 25% drop in interfacial conductance. Our work demonstrates that ultrafast x-ray diffraction can serve as a precise thermal metrology tool for characterizing heat transport in multilayered thin-film structures for next-generation microelectronic devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_02658 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Spatiotemporal Mapping of Anisotropic Thermal Transport in GaN Thin Films via Ultrafast X-ray Diffraction Nguyen, Thanh Fu, Chuliang Cheng, Mouyang Li, Buxuan Espedal, Tyra E. Chen, Zhantao Qiao, Kuan Neeraj, Kumar Chotrattanapituk, Abhijatmedhi Carrizales, Denisse Cordova Rha, Eunbi Liu, Tongtong Kajale, Shivam N. Sarkar, Deblina Walko, Donald A. Wen, Haidan Boriskina, Svetlana V. Chen, Gang Kim, Jeehwan Li, Mingda Materials Science Efficient thermal management is essential for the reliability of modern power electronics, where increasing device density leads to severe heat dissipation challenges. However, in thin-film systems, thermal transport is often compromised by interfacial resistance and microscale defects introduced during synthesis or transfer, which are difficult to characterize using conventional techniques. Here we present a non-contact, spatiotemporal-resolved ultrafast x-ray diffraction method to extract in-plane thermal conductivity and thermal boundary conductance, using GaN thin films on silicon as a model system. By tracking the pump-induced lattice strain, we reconstruct the lateral heat flow dynamics and quantitatively probe thermal transport near a wrinkle defect. We uncover pronounced asymmetric heat dissipation across the wrinkle, with a four-fold reduction in the local thermal conductivity near the wrinkle and a 25% drop in interfacial conductance. Our work demonstrates that ultrafast x-ray diffraction can serve as a precise thermal metrology tool for characterizing heat transport in multilayered thin-film structures for next-generation microelectronic devices. |
| title | Spatiotemporal Mapping of Anisotropic Thermal Transport in GaN Thin Films via Ultrafast X-ray Diffraction |
| topic | Materials Science |
| url | https://arxiv.org/abs/2507.02658 |