Hailing Jiang, Tao Wang, Zhenyu Zhang, Fang Liu, Ruochen Shi, Bowen Sheng, Shanshan Sheng, Weikun Ge, Ping Wang, Bo Shen, Bo Sun, Peng Gao, Lucas Lindsay, Xinqiang Wang
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引用次数: 0
Abstract
Phonon engineering is crucial for thermal management in GaN-based power devices, where phonon-defect interactions limit performance. However, detecting nanoscale phonon transport constrained by III-nitride defects is challenging due to limited spatial resolution. Here, we used advanced scanning transmission electron microscopy and electron energy loss spectroscopy to examine vibrational modes in a prismatic stacking fault in GaN. By comparing experimental results with ab initio calculations, we identified three types of defect-derived modes: localized defect modes, a confined bulk mode, and a fully extended mode. Additionally, the PSF exhibits a smaller phonon energy gap and lower acoustic sound speeds than defect-free GaN, suggesting reduced thermal conductivity. Our study elucidates the vibrational behavior of a GaN defect via advanced characterization methods and highlights properties that may affect thermal behavior.
声子工程对于氮化镓基功率器件的热管理至关重要,因为声子-缺陷相互作用限制了器件的性能。然而,由于空间分辨率有限,探测受氮化镓 III 缺陷限制的纳米级声子传输具有挑战性。在这里,我们使用先进的扫描透射电子显微镜和电子能量损失光谱来研究氮化镓棱柱堆叠断层中的振动模式。通过将实验结果与 ab initio 计算结果进行比较,我们确定了三种缺陷衍生模式:局部缺陷模式、约束块体模式和完全扩展模式。此外,与无缺陷氮化镓相比,PSF 表现出更小的声子能隙和更低的声速,表明热导率降低。我们的研究通过先进的表征方法阐明了氮化镓缺陷的振动行为,并强调了可能影响热行为的特性。
期刊介绍:
Nature Communications, an open-access journal, publishes high-quality research spanning all areas of the natural sciences. Papers featured in the journal showcase significant advances relevant to specialists in each respective field. With a 2-year impact factor of 16.6 (2022) and a median time of 8 days from submission to the first editorial decision, Nature Communications is committed to rapid dissemination of research findings. As a multidisciplinary journal, it welcomes contributions from biological, health, physical, chemical, Earth, social, mathematical, applied, and engineering sciences, aiming to highlight important breakthroughs within each domain.