Electronic structure and carrier mobility in graphdiyne sheet and nanoribbons: Theoretical predictions

摘要

Using density functional theory coupled with Boltzmann transport equation with relaxation time approximation, we investigate the electronic structure and predict the charge mobility for a new carbon allotrope, the graphdiyne for both the sheet and nanoribbons. It is shown that the graphdiyne sheet is a semiconductor with a band gap of 0.46 eV. The calculated in-plane intrinsic electron mobility can reach the order of 10~5 cm~2/(V s) at room temperature, while the hole mobility is about an order of magnitude lower.