In this work, we present an investigation of the Ag-PPP (polyparaphenylene) interface using ballistic electron emission microscopy. Our work is the first successful application of the BEEM technique to metal-organic interfaces. We observe nanometer scale injection inhomogeneities. They have an electronic origin, since we find corresponding Schottky barrier variations. We also determine the transmission function of Ag-PPP interface and find that it agrees qualitatively with the theoretical calculations for a metal-phenyl ring interface. We conclude that charge transport across inhomogeneous barriers needs to be considered for understanding electronic transport across metal-organic interfaces and organic device characteristics.
@article{arxiv.cond-mat/0501039,
title = {Metal Organic interfaces at the nanoscale},
author = {Cedric Troadec and Deng Jie and Linda Kunardi and Sean J O'Shea},
journal= {arXiv preprint arXiv:cond-mat/0501039},
year = {2009}
}