BAND BENDING MODIFIED TUNNELING AT METAL CONJUGATED POLYMER INTERFACES/

Metal/polymer interfaces play an important role in polymeric light-emi tting diodes. Recent transport measurement studies by Parker promote a rigid band model with triangular barrier tunneling at the metal/polym er interface. This finding, however, stands in contradiction to the ba nd bending and Schottky barrier formation observed using surface analy tical techniques. We found that this apparent contradiction can be nic ely reconciled if a modification of the tunneling model by band bendin g is included in the interpretation of the transport data. Band bendin g modified tunneling gives a clear physical picture of the tunneling p rocess across the metal/polymer interface and is important for low fie ld tunneling processes. (C) 1995 American Institute of Physics.