Intermolecular Potentials Polysilicon

I’m currently working on an MD MEMS project and I need to find the intermolecular potential for polysilicon and how to incorporate it into my lammps code.

If you mean inter-"atomic" potentials for Si/poly-Si, there are tons
out there in the Literature, and LAMMPS has several, including SW,
Tersoff, COMB and ReaxFF. You can start from examples and choose your
favorite one.