Chemical effects on the optical band-gap of heavily doped ZnO: MIII (M=Al,Ga,In): An investigation by means of photoelectron spectroscopy, optical measurements under pressure, and band structure calculations

1. Sans, J.A.
2. Sánchez-Royo, J.F.
3. Segura, A.
4. Tobias, G.
5. Canadell, E.