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Anisotropic in-plane thermal conductivity of black phosphorus

Anisotropic in-plane thermal conductivity of black phosphorusMAs a layered semiconductor, black phosphorous exhibits strong anisotropy in its thermal conductivity along the zigzag (ZZ) and armchair (AC) directions.

Scientific Achievement
Discovered a factor of two difference in thermal conductivity along two different directions in few-layer black phosphorous (BP).

Significance and Impact
This anisotropy could boost energy-efficient transistor and thermoelectric device design.

Research Details

  • Thermal conductivity of BP nanoribbons was measured as a function of temperature and ribbon orientation and sizes
  • Strong anisotropy in thermal conductivity was attributed mainly to phonon dispersion, which is orientation-dependent
  • This opens 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)