Microelectronic fabrication method minimizing threshold...

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H01L 21/265 (2006.01) H01L 21/425 (2006.01) H01L 27/108 (2006.01) H01L 29/10 (2006.01)

Patent

CA 1132722

ABSTRACT A microelectronic fabrication process for minimizing the threshold voltage variation across the surface of a wafer of semiconductor material. The process precisely specifies the degenerate (or heavily doped) impurity profile distribution by using ion implantation so as to minimize the autodoping of adjacent gate regions immediately after the ion implantation step prior to gate oxidation, while maximizing the surface concentration of the dopant at the ultimate silicon surface to achieve appropriate surface sheet resistance and junction depth after all circuit fabrication steps have been completed.

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