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In this paper, we report an innovative method to generate a polypyrrole (PPy)/p-type Si junction. This method includes three fabrication steps. First, a PPy thin film is coated on a polymethylmethacrylate (PMMA) sheet. Second, a microstructure-formed p-type Si mold is inserted into the PMMA sheet. Finally, after separation of the mold and the substrate, the part of the PPy right underneath convex...