Polarization induced high mobility wide electron slabs in graded pseudomorph MgxZn1−xO/ZnO heterostructure

In this work, we demonstrate the layer-by-layer epitaxy of Mg-composition graded ZnMgO/ZnO heterostructure on sapphire substrate by MOVPE technique. The polarization field tailored by the graded heterostructure induces wide electron slabs with high mobility at low temperature. The transport properties and mechanisms have been discussed in details.