Heterojunction diodes of soluble conducting polypyrrole with porous silicon

The heterojunction diodes made between porous silicon (PS) and soluble polypyrrole (PPy), Au/PPy–PS/Al cell were fabricated. Compared to PS Schottky diodes, the rectifying characteristics of Au/PPy–PS/Al diodes were significantly improved. Moreover, it was found that the rectifying characteristics of the heterojunction diodes were strongly dependent of the doping degree, dopants and solvents for the doped PPy films. It was also noted that decreasing oxidation of PS exposed to air is an effective role to improve the rectifying characteristics of the diodes.