Investigation of As-doped ZnO films synthesized via thermal annealing of ZnSe/GaAs heterostructures

We synthesized ZnO films via oxidative annealing of ZnSe/GaAs heterostructures and investigated their structural and optical properties. Films were polycrystalline, c-axis oriented and exhibited superior optical properties. In addition, we detected nanometer-size As clusters into the ZnO film and a GaxOy layer at the ZnO/GaAs interface. Formation of an interfacial layer can prevent use of this technique for p-type doping and complicates identification of the origin of p-type response in the annealed ZnO/GaAs heterostructures.