Voltage output for PVDF

Hi

I am faily new to comsol and was told that it was good to model piezoelectric responses.

I am trying to model something transient voltage output but using flexible film. I cannot figure out how to do that. I have a sinusoidal boundary load acting on the PVDF (have piezo properties), but i do not know how to get voltage output from it. WOuld it be possible to help me.

Thank you
Caumaghen