The surface passivation of Type-II InAs/GaSb superlattice photodectors, achieved by using various ammonium sulfide solutions, was studied. It was found that the zero-bias resistance of treated photodetectors was improved by over an order of magnitude and reverse-bias dark current density was reduced by approximately two orders of magnitude. The overall dark current was modeled by taking into account the trap-assisted tunnelling leakage. The model showed more than an 70 times reduction in trap density for passivated detectors.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)