Structures useful for forming contacts to materials having low charge carrier mobility are described. Methods for their formation and use are also described. These structures include interdigitated electrodes capable of making electrical contact to semiconducting materials having low electron and/or whole mobility. In particular, these structures are useful for organic semiconducting devices made with conducting polymers and small molecules. They are also useful for semiconducting devices made with nanocrystalline semiconductors.
STATEMENT OF GOVERNMENT RIGHTS
 This invention was made with Government support under contract number DE-ACO2-98CH10886, awarded by the U.S. Department of Energy. The Government has certain rights in the invention.