The raw materials of photovoltaic modules are composed of eight main materials and production auxiliary materials.
The eight main materials are:
(1) Cells: Solar cells directly convert light energy into energy electrical A. device. It is made of semiconductor materials. Through the irradiation of the sun, the electron-hole pairs are excited, and the electrostatic field of the P-N junction barrier region is used to separate the electron-hole pairs. The separated electrons and holes are collected and emitted outward from the battery through the. electrodes, forming a current.
(2) Tin-Plated Copper Strip: Made from sheared and straightened oxygen-free copper, with hot-dip coating on all exterior surfaces. Tinned tape is used to bring out the electrodes of solar cells and connect the cells during the production ofe photovoltaic solar modules. High operability, firmness and welding flexibility are required.
(3) EVA: a copolymer of ethylene and vinyl acetate, a hot melt adhesive. It is used to encapsulate cells to prevent the external environment from affecting the electrical performance of cells, improve the light transmission of photovoltaic modules, and bond cells, tempered glass and backsheets with a certain bonding strength. the component's output has a gain effect.
(4) Back plate: used as back protective packaging material. Commonly used materials are T-door, TPE and PET, polyethylene frame. It is used to improve the aging and corrosion resistance of photovoltaic modules and extend the service life of photovoltaic modules; the white backsheet disperses incident light into thes photovoltaic modules, thereby improving the light absorption efficiency of photovoltaic modules. due to its high infrared emissivity, it can also reduce the operating temperature of photovoltaic modules; at the same time, it improves the insulation performance of photovoltaic modules;
(5) Tempered glass: used to support the structure of photovoltaic modules, improve the load-bearing capacity and load-bearing of photovoltaic modules, and has the characteristics of light transmission, anti- light reflection and transmission, water blocking, gas blocking and anti-corrosion effect.
(6) Aluminum frame: The aluminum alloy frame installed outside the glass plays a role in protecting the edge of the glass, strengthening the performance sealing of the photovoltaic module and improving the overall mechanical strength of the photovoltaic module, which is convenient for installationllation and transport of photovoltaic modules.
(7) Silicone: used to bond and seal laminated glass photovoltaic modules, to bond junction boxes and backsheets, and to improve the UV resistance of photovoltaic modules.
(8) Junction box: the electrical connection device of the photovoltaic module, which seals and waterproofs the lead wires of the photovoltaic module and protects the safety of the photovoltaic module system during operation.