A semiconductor fabrication method of forming a pair of transistor gates of opposite conductivity type by partially forming first and second gate stacks comprising an insulation layer, a conductive layer and polysilicon layer for the pair of transistor by removing a portion of the polysilicon layer. The polysilicon layer includes a dominant region of first-type conductive dopants and a dominant region of second-type conductive dopants. A first-type conductive transistor gate is formed by, completing the formation of the first gate stack and a second-type conductive transistor gate is formed by completing the formation of the second gate stack separately from the formation of the first-type transistor gate.