The materials used to manufacture solar panels (photovoltaic panels) are critical factors determining their power generation performance, service life, and reliability. Photovoltaic panels are primarily composed of solar cells, glass, encapsulation materials, backsheets, metal frames, and connection components. Among these, solar cells are the core components responsible for converting sunlight into electrical energy, while other auxiliary materials serve to protect and secure the cells and enhance the module's durability. The performance characteristics of these various materials directly influence the panel's conversion efficiency, mechanical strength, and long-term operational stability.
Solar cells are typically manufactured using semiconductor materials, the most common being crystalline silicon-specifically monocrystalline silicon and polycrystalline silicon. Monocrystalline silicon features a perfect crystal structure and high electron transport efficiency; consequently, panels made from it offer higher conversion efficiency and a longer service life, making them the mainstream product in the market. Although polycrystalline silicon involves a relatively simpler production process and lower manufacturing costs, its energy conversion efficiency is slightly lower than that of monocrystalline silicon. Beyond silicon, some newer photovoltaic panels utilize thin-film materials-such as cadmium telluride (CdTe), copper indium gallium selenide (CIGS), and perovskites-which offer advantages like light weight, flexibility, or unique manufacturing processes, making them suitable for diverse environments and specialized applications.
Within the structure of a photovoltaic module, tempered glass serves as a crucial protective material; typically positioned on the front, it protects the internal solar cells while ensuring effective sunlight transmission. The glass must possess high light transmittance, impact resistance, and weatherability to withstand long-term outdoor use. Encapsulation materials-commonly ethylene-vinyl acetate (EVA) or polyolefin elastomer (POE)-are used to secure the solar cells and prevent moisture and air from penetrating the module's interior. The backsheet, located at the rear of the panel, provides electrical insulation and moisture protection for the internal structure; common materials include polymer composites.
In addition to these core materials, photovoltaic panels require auxiliary components such as aluminum alloy frames, junction boxes, and conductive circuitry. Aluminum alloy frames are lightweight, strong, and corrosion-resistant, enhancing the module's overall structural stability while facilitating transport and installation. The junction box collects the current generated by solar cells and provides a degree of protection, typically featuring water and dust resistance. As photovoltaic technology advances, manufacturing materials are continuously being optimized; the application of new, high-performance materials enables solar panels to achieve higher conversion efficiency, longer service lives, and superior environmental adaptability, thereby providing vital support for the development of the solar energy industry.