Conductance and dielectric properties of hydrogen and hydroxyl passivated SiCNWs*

Based on the transport theory and the polarization relaxation model, the effects of hydrogen and hydroxyl passivation on the conductivity and dielectric properties of silicon carbide nanowires (SiCNWs) with different sizes are numerically simulated. The results show that the variation trend of conductivity and band gap of passivated SiCNWs are opposite to the scenario of the size effect of bare SiCNWs. Among the influencing factors of conductivity, the carrier concentration plays a leading role. In the dielectric properties, the bare SiCNWs have a strong dielectric response in the blue light region, while passivated SiCNWs show a more obvious dielectric response in the far ultraviolet-light region. In particular, hydroxyl passivation produces a strong dielectric relaxation in the microwave band, indicating that hydroxyl passivated SiCNWs have a wide range of applications in electromagnetic absorption and shielding.

Automated summary

The effects of hydrogen and hydroxyl passivation on the conductivity and dielectric properties of silicon carbide nanowires (SiCNWs) with different sizes were numerically simulated. The carrier concentration plays a leading role in the influencing factors of conductivity, while passivated SiCNWs show a more obvious dielectric response in the far ultraviolet-light region. Hydroxyl passivated SiCNWs have a wide range of applications in electromagnetic absorption and shielding, particularly in the microwave band.