Anisotropic in-plane thermal conductivity observed in few-layer black phosphorus

By Zhe Luo, J. Maassen, Yexin Deng, Yuchen Du, Richard P. Garrelts, Mark S. Lundstrom, Peide D. Ye, Xianfan Xu. Nature Communications, 2015

621 citations recorded by the source corpus.

Black phosphorus has been revisited recently as a new two-dimensional material showing potential applications in electronics and optoelectronics. Here we report the anisotropic in-plane thermal conductivity of suspended few-layer black phosphorus measured by micro-Raman spectroscopy. The armchair and zigzag thermal conductivities are ∼20 and ∼40 W m−1 K−1 for black phosphorus films thicker than 15 nm, respectively, and decrease to ∼10 and ∼20 W m−1 K−1 as the film thickness is reduced, exhibiting significant anisotropy. The thermal conductivity anisotropic ratio is found to be ∼2 for thick black phosphorus films and drops to ∼1.5 for the thinnest 9.5-nm-thick film. Theoretical modelling reveals that the observed anisotropy is primarily related to the anisotropic phonon dispersion, whereas the intrinsic phonon scattering rates are found to be similar along the armchair and zigzag directions. Surface scattering in the black phosphorus films is shown to strongly suppress the contribution of long mean-free-path acoustic phonons. The two-dimensional material black phosphorus could find uses in energy applications. Here, the authors study the difference in in-plane thermal conductivity along the armchair and zigzag directions in suspended few-layer black phosphorus, and show the dependence of this anisotropy on sample thickness.

Subfields: Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/5a98d177f8c8a42d1d2c5135047792db71cdf531

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In Materials Chemistry

1. Xiaobo Yin
2. Yujie Wei
3. Baowen Li
4. Xiaokun Gu
5. Ronggui Yang
6. Hui‐Ming Cheng
7. Feiyu Kang
8. Bilu Liu

Citations in the corpus

• Colloquium: Phononic thermal properties of two-dimensional materials (2017, background): “The thermal conductivity of thin films of a few layered 2D materials, such as black phosphorus (Jang et al., 2015; Lee, Yang et al., 2015; Luo et al., 2015; J. Zhu et al., 2016), TaSe2 (Yan et al., 2013), and Bi2Te3 (Pettes et al., 2013), with a thickness on the order of 10 to 100 nm, has been…”
• Two-Dimensional Materials for Thermal Management Applications (2018, result): “It was also theoretically predicted that some 2Dmaterials could show anisotropic thermal properties in the basal x-y plane,(77,78) which was later experimentally observed in BP.(55,79) Klemens has calculated the intrinsic in-plane thermal conductivity of graphite(75,80) and found it to be 1,910 W m ”