Monocrystalline panels use single-crystal silicon for higher efficiency (18-22%), while polycrystalline panels use multiple silicon fragments for lower cost but reduced efficiency (15-17%). . Solar Photovoltaics (PV) is the direct conversion to electric current at the junction of two substances exposed to solar energy. Solar energy is composed of photons which are. . There are three main types of solar panels: monocrystalline, polycrystalline, and thin film. Each of these types has its own unique characteristics and advantages PV manufacturers need to be aware of. Monocrystalline solar panels are made from a single crystal of silicon. The key differences are efficiency (mono is more efficient), heat tolerance (poly handles heat better), aesthetics (mono looks more attractive), pricing (poly is cheaper. .