DFT calculations on the structural and electronic properties of vacancy effects in the silicon nanowires Fernanda L.A. Cruz, Horácio W.L. Alves, Fernando Sato and Ana Claudia M. Carvalho Eur. Phys. J. B, 92 4 (2019) 66 Published online: 01 April 2019 DOI: 10.1140/epjb/e2019-90571-6