Patent ID: 7666706

Claim:
A method for making a thin-film poly-crystalline silicon solar cell comprising the steps of: providing an ITO-glass substrate by coating a glass substrate with a transparent and conductive ITO film; growing an amorphous silicon film on the ITO-glass substrate; growing an aluminum film on the amorphous silicon film; annealing and therefore converting the aluminum film and the amorphous silicon film into an aluminum-silicon alloy film and a p + poly-crystalline silicon film, respectively, through the downward migration of aluminum from the aluminum film into the amorphous silicon film; coating a p − poly-crystalline silicon film on the p + poly-crystalline silicon film and an n + poly-crystalline silicon film on the p − poly-crystalline silicon film in a low-temperature plasma-based deposition process; providing an ohmic contact on the transparent and conductive ITO film and providing ohmic contacts on the n + poly-crystalline silicon film; and coating an anti-reflection film on the n + poly-crystalline silicon film.