It doesn't make much sense to me, either. As Origin says, holes and electrons must move in opposite directions. Also, because you have a conducting layer between the plates you will simply have a current flow when you try and "charge" it - the "capacitor plates" will simply act as low-resistance contacts to the semiconductor layer.
And, when you stop "charging", if there were any charge on the plates it would simply equalise across the conducting layer in the middle.
At the very best, you seem to have invented the bipolar junction transistor:
--------- <-- n-doped "plate" (collector)
XXXXXXXXX <-- p-doped "dielectric" (base)
--------- <-- n-doped "plate" (emitter)