Progress in ZnO Acceptor Doping: What Is the Best Strategy?
Figure 3
Formation energy of interstitial hydrogen in ZnO as a function of Fermi level, obtained from DFT-LDA calculations and referenced to the energy of a free H2 molecule. Zero-point energies are included. The zero of Fermi energy is chosen at the top of the valence band. Reprinted with permission from [14]. Copyright 2001 by Elsevier Science B.
