Chepela Lesia, Lishchuk Pavlo, Nkenfack Isibert Marcel, Mandrolko Viktor, Chaynes Hadrien, Kuzmich Andrey, Liu Poting, Borovyi Mykola, Lacroix David, Sivakov Vladimir, Isaiev Mykola
Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Street, Kyiv, 01601, Ukraine.
Université de Lorraine, CNRS, LEMTA, 54000, Nancy, France.
Sci Rep. 2025 Aug 26;15(1):31482. doi: 10.1038/s41598-025-13379-4.
This study explores the thermal conductivity of nanostructured porous silicon with different morphology produced by metal-assisted chemical etching of silicon wafers with different dopants, doping levels and crystallographic orientation. The wide range of morphological structures observed in the samples strongly depends on the initial wafer characteristics, a factor that cannot be neglected. While previous studies have demonstrated the qualitative capabilities of photoacoustic and Raman spectroscopy in characterizing nanostructured silicon, our work highlights the quantitative discrepancies that can arise when combining these techniques to investigate thermal properties. The differences in the results obtained using these methods can be attributed to the distinct nature of the information they provide: photoacoustic spectroscopy probes the effective thermal conductivity over larger areas, whereas Raman spectroscopy offers localized measurements. Furthermore, our Monte Carlo simulations provide insights into the morphological features of porous silicon that influence the interpretation of experimental data. This study underscores the importance of a comprehensive approach, combining both experimental and theoretical methods, to accurately assess the thermal transport properties of nanostructured materials.
本研究探讨了通过对具有不同掺杂剂、掺杂水平和晶体取向的硅片进行金属辅助化学蚀刻制备的不同形态的纳米结构多孔硅的热导率。在样品中观察到的广泛形态结构很大程度上取决于初始硅片的特性，这一因素不可忽视。虽然先前的研究已经证明了光声光谱和拉曼光谱在表征纳米结构硅方面的定性能力，但我们的工作强调了在结合这些技术研究热性质时可能出现的定量差异。使用这些方法获得的结果差异可归因于它们提供的信息的不同性质：光声光谱探测较大区域的有效热导率，而拉曼光谱提供局部测量。此外，我们的蒙特卡罗模拟为影响实验数据解释的多孔硅形态特征提供了见解。本研究强调了采用综合方法，将实验和理论方法相结合，以准确评估纳米结构材料热输运性质的重要性。
