Abstract
Abstract Thin transparent and conductive films of polypyrrole have been grown by photoassisted electrochemical oxidation on n-type single crystal Si and hydrogenated amorphous Si electrodes. The junction formation between polypyrrole and Si has been studied and indicates an electronegativity of polypyrrole about the same as Au. Highly stable photoanodes based on n-Si protected with a thin coating of Pt and electrochemically grown polypyrrole films have been studied as electrochemical photovoltaic cells in aqueous I−/I3 −, Fe2+/3+, and Fe(CN)6 4-/3- electrolytes. In the I−/I3 − electrolyte the cells are stable over a time period of weeks. Solid state Schottky cells using polypyrrole as the front contact yield efficiencies inferior to those of the electrochemcial cells due to high sheet resistivity in the polypyrrole layer.
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