Figure 5
The whole energy band diagrams of two kinds of heterostructures after poled by +8 V or −8 V when the heterostructures are under illumination and all the two electrodes are short-circuited.
(a,b) The ITO/PZT/ZnO/Au heterostructure poled by (a) +8 V and (b) −8 V; (c,d) The ITO/ZnO/PZT/Au heterostructure poled by (c) +8 V and (d) −8 V. In each energy band diagram, the internal electric fields distribution and the generation, separation and motion of photo-induced carriers under incident light are diagrammatically presented.
