Guide to the Composition of Raw Materials for Photovoltaic Modules

Photovoltaic modules are primarily made from silicon, glass, metal frames, encapsulants, backsheets, busbars, and sealants.Core Materials1. Silicon: The most critical material in PV modules, silicon f...

Guide to the Composition of Raw Materials for Photovoltaic Modules

Photovoltaic modules are primarily made from silicon, glass, metal frames, encapsulants, backsheets, busbars, and sealants.

Core Materials

1. Silicon: The most critical material in PV modules, silicon forms the solar cells that convert sunlight into electricity. High-purity monocrystalline or polycrystalline silicon wafers are used to create PN junctions, which generate electric current when exposed to sunlight. Silicon accounts for roughly 90% of the module cost and is derived from quartz sand through processes like polysilicon production and wafer fabrication . 2. Glass: Tempered glass serves as the front protective layer of the module, providing structural support, high light transmittance, and resistance to environmental factors such as rain, wind, and debris . 3. Metal Frames: Typically made of aluminum, frames protect the module from mechanical stress, corrosion, and moisture while facilitating mounting and durability in outdoor conditions . 4. Encapsulants: Ethylene-vinyl acetate (EVA) is commonly used to bond the solar cells to the glass and backsheet, providing insulation, mechanical stability, and protection from moisture and UV radiation . 5. Backsheets: The backsheet protects the rear of the module from environmental damage, enhances insulation, and improves light absorption efficiency. It is usually made from polymer-based materials . 6. Busbars and Conductive Ribbons: Tin-coated copper or aluminum strips connect individual solar cells, collecting and distributing the generated current efficiently . 7. Sealants: Silicone or silicon-based sealants are used to bond components, prevent water ingress, and enhance the module's durability against UV exposure and temperature fluctuations .

Additional Notes

Other minor materials include junction boxes, wiring, and adhesives, which ensure electrical connectivity and module integrity. The combination of these materials allows PV modules to efficiently convert sunlight into electricity while maintaining long-term performance in outdoor environments .

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