Study on interface barrier between Au contact and p-CZT

The effect of passivation with NH₄F/H₂O₂ agent on p-CZT surface is studied by synchrotron photoemission spectroscopy (SRPES). It is found that the peak representing surface states disappeares after the passivation treatment. Two processing methods, without passivation treatment and with passivation treatment are adopted to compare the effects of passivation treatment. The interface barrier between Au contact and p-CZT is studied by synchrotron photoemission spectroscopy (SRPES), where the interface barrier is determined by the discrepancy between E_v-c deduced by the core level with valence band region and EB deduced by the core level with the Fermi edge. The interface barrier is determined to be (0.88±0.1)eV for Au/p-CZT without passivation and for Au/p-CZT after passivation, respectively.