Unlocking p-type conductivity in Cu:ZnO thin films: a first-principles investigation on the role of Cu 3d states and self-compensation

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) introduces shallow acceptor states near the valence band maximum, while Cu 3d orbital hybridization with O 2p states drives band gap narrowing. Self-compensation by an oxygen vacancy donor limits the net hole concentration at concentrations above 2 at%. The computed Fermi energy decreases by 0.844 eV at 2 at% Cu, providing direct evidence of p-type character onset. These results provide a unified mechanistic picture of Cu-induced p-type conductivity in ZnO thin films and establish doping windows for device-relevant carrier control.