The majority of PV cells produced today use crystalline silicon (c-Si) as it is a light absorbing semiconductor. A polycrystalline cell (also called multi-crystalline) is cut from a multifaceted silicon crystal. Polycrystalline solar panels are one of the most popular choices for grid connected and off grid solar power systems. They are usually than monocrystalline panels, but not as efficient.
Poly-crystalline Cells – Definition, Glossary, Details – Solar Mangoadmin