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Anisotropic in-plane thermal conductivity of black phosphorus
Users of the Molecular Foundry discovered a factor of two difference in thermal conductivity along the zigzag and armchair directions in few-layer black phosphorous (BP).
Significance and Impact
Such anisotropy could boost energy-efficient transistor and thermoelectric device design.
- Using a microfabricated suspended device, thermal conductivity of BP nanoribbons was measured as a function of temperature and ribbon orientation and sizes
- The strong anisotropy was attributed mainly to phonon dispersion with some contribution from phonon-phonon scattering rate, both of which are orientation-dependent
- These orientation and size-dependent thermal conductivities open opportunities to design microelectronic devices with different lattice orientations for cooling & operating microchips
S Lee, F Yang, J Suh, SYang, Y Lee, G Li, HS Choe, A Suslu, Y Chen, C Ko, J Park, K Liu, J Li, K Hippalgaonkar, J Urban, S Tongay & J Wu. Nature Comms., 6, 8573 (2015)