<li>'''Crystalline silicon modules:''' The most common type of module on the market. These modules can come in poly or monocrystalline construction. The names are derived from the way that they are manufactured with monocrystalline cells being cut from a single crystal and polycrystalline cells being comprised of silicon from various crystals. Both types are composed of a few simple materials (average by weight): 76% glass (panel surface), 10% polymer (encapsulant and backsheet foil), 8% aluminum (mostly the frame), 5% silicon (PV cells), 1% copper (interconnectors) and less than 0.1% silver (contact lines) and other metals (mostly tin and lead).<ref name="irena"> IRENA End-of-Life Management Solar Photovoltaic Panels. https://www.irena.org/-/media/Files/IRENA/Agency/Publication/2016/IRENA_IEAPVPS_End-of-Life_Solar_PV_Panels_2016.pdf </ref>
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:*Monocrystalline modules are more expensive, but achieve higher average efficiencies around 17-20%.
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:*Polycrystalline modules are less expensive and are less efficient with average efficiencies around 16-17%.
