A novel Active Pixel Sensor (APS) cell structure and method of manufacture. Particularly, an image sensor APS cell having a predoped transfer gate is formed that avoids the variations of V.sub.t as a result of subsequent manufacturing steps. According to the preferred embodiment of the invention, the image sensor APS cell structure includes a doped p-type pinning layer and an n-type doped gate. There is additionally provided a method of forming the image sensor APS cell having a predoped transfer gate and a doped pinning layer. The predoped transfer gate prevents part of the gate from becoming p-type doped.