0.000000000007? Really????????????????
I can't make heads or tails of your circuit. You've got two voltage sources, but 3 labels VDD8 VDD3 VDD9. You've got some pulse definition, but I can't tell which voltage source it's connected to. You've got the substrate of the MOSFET tied to ground, but the source tied to VDD3 (maybe it's VDD8)-- I think you want the substrate connected to source.
But, as Tony alluded to, you probably aren't driving the gate voltage high enough.