A method for manufacturing a semiconductor device according to one or more embodiments may include growing a first epitaxy layer at a first side and a second side of a stack of gates and channels, applying a sacrificial layer on the first epitaxy layer, growing a second epitaxy layer on the sacrificial layer, removing the sacrificial layer, and depositing a metal layer on the first epitaxy layer and the second epitaxy layer at the first side of the stack of gates and channels.