The stability and electronic structures of AIN nanowires with and without N-vacancy are investigated using firstprinciples calculations. We find that there is an inverse correlation between formation energy and diamet...The stability and electronic structures of AIN nanowires with and without N-vacancy are investigated using firstprinciples calculations. We find that there is an inverse correlation between formation energy and diameter in ideal AlN nanowires. After calculating the formation energies of N-vacancy at different sites in AlN nanowires with different diameters, we find that the N-vacancy prefers to stay at the surface of the nanowires and it is easier to fabricate them under Al-rich conditions. Through studying the electronic properties of AlN nanowires with N-vacancies, we further find that there are two isolated bands in the deep part of the band gap, one of them is fully occupied and the other is half occupied. The charge density indicates that the half-fully occupied band arises from the Al at the surface, and this atom becomes an active centre.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 11074200 and 61176079)the Natural Science Fund of Shaanxi Province,China (Grant No. 2009JM1005)
文摘The stability and electronic structures of AIN nanowires with and without N-vacancy are investigated using firstprinciples calculations. We find that there is an inverse correlation between formation energy and diameter in ideal AlN nanowires. After calculating the formation energies of N-vacancy at different sites in AlN nanowires with different diameters, we find that the N-vacancy prefers to stay at the surface of the nanowires and it is easier to fabricate them under Al-rich conditions. Through studying the electronic properties of AlN nanowires with N-vacancies, we further find that there are two isolated bands in the deep part of the band gap, one of them is fully occupied and the other is half occupied. The charge density indicates that the half-fully occupied band arises from the Al at the surface, and this atom becomes an active centre.
