The study on Schottky contact between Au and clean CdZnTe

Au Schottky contact was deposited on the clean CZT (1 1 0) and (1 1 1) A surface by molecular beam epitaxy (MBE). The real Schottky barrier heights were measured to be 0.738 eV and 0.566 eV by Synchrotron radiation photoemission spectroscopy (SRPES) respectively. The constituents of (1 1 0) and (1 1 1) A surfaces were measured by XPS. The Te concentration on (1 1 1) A surface is higher than that of (1 1 0) surface. And the difference of chemical reactivity and charge transfer were identified by Au 4f7/2, Cd 4d, Te 4d5/2 core level shifts using SRPES. Using metal-induced gap states model, the results of experiment were explained.