You realize that pretty much every group V dopant has been already measured? The problem is that n-type dopants are deep in energy, far away from the conduction

You realize that pretty much every group V dopant has been already measured? The problem is that n-type dopants are deep in energy, far away from the conduction band. So the electron from the donor stays with the dopant atom rather than activating and putting its electron in the conduction band. > Maybe nitrogen or oxygen would be a better choice, for the similarity in molecule size [Typo: Dopants are atoms not molecules.] Many Group V atoms have been tried. See eg http://phycomp.technion.ac.il/~david/thesis/node17.html http://phycomp.technion.ac.il/~david/thesis/node17.html