Patent ID: 6627494
Filing Date: 2003-09-30
Classification: H01L

Abstract:
A method for forming a gate electrode for a flash memory, comprising:providing a semiconductor substrate; forming a tunnel oxide film on the semiconductor substrate; forming a first conductive film on the tunnel oxide film; forming a TaON film on the first conductive film; crystallizing the TaON film by annealing the TaON film at 600 to 950Â° C. in an atmosphere of N2O or O2 by using an electric furnace or plasma in in-situ or ex-situ; forming a second conductive film on the crystallized TaON film; forming a gate electrode pattern, the gate electrode pattern serving as an etch mask; and etching the second conductive film, the TaON film, the first conductive film, and the tunnel oxide film to form a gate electrode.