Project 1 - Electron transfer at inorganic semiconductor | conjugated polymer interfaces.

Our work in this area has focused on the demonstration and understanding of unprecedented control over the electrical characteristics of a solid-state semiconductor interface. Much of our work has focused on the interface between InP and the conjugated polymer polypyrrole in its doped, electrically conductive state. We have demonstrated continuous and remarkably broad control over the electrical characteristics of this interface through in situ electrochemical manipulation of the polypyrrole to control its level of oxidative or "p-type" doping (as illustrated by the family of current-voltage curves shown in the top left figure). In addition, we have developed a sufficient mechanistic understanding of charge transport ,including the role of nanometer scale heterogeneity, to understand the remarkable tunable properties observed.

Selected Publications
1. M. C. Lonergan, Science 278, 2103-2106 (1997).
2. C. Daniels-Hafer, M. Jang, S.W. Boettcher, R. Danner, and M.C. Lonergan, J. .Phys. Chem. 106, 1622 (2002).