ZINC OXIDE-BASED MULTILAYER STRUCTURAL BODY AND ITS PRODUCING METHOD

摘要

[PROBLEMS] When zinc oxide semiconductor is used for an electric element, it is effective particularly to cause charge separation by comprising zinc oxide crystals of different states. [MEANS FOR SOLVING PROBLEMS] A zinc oxide-based multilayer structural body composed of a zinc oxide layer having a lattice volume Va and a donor concentration Na or a zinc oxide sold solution layer and a zinc oxide layer having a lattice volume Vb and a donor concentration Nb or a zinc oxide solid solution layer. The lattice volumes Va and Vb satisfy the relation Va<Vb, and the donor concentrations Na and Nb satisfy the relation Na>Nb. The zinc oxide layer having the lattice volume Va serves as a charge supply layer, and the zinc oxide layer having the lattice volume Vb serves as a charge acceptive layer. The zinc oxide-based multilayer structural body is characterized in that even while no electric field is applied from outside to the multilayer structural body, a state that charges move from the layer serving as the charge supply layer into the layer serving as the charge acceptive layer is established, and a depletion layer is formed in the charge supply layer because of this charge movement.