As an important role in the field of clean energy, the choice of materials for solar panels plays a decisive role in the photoelectric conversion efficiency and service life. At present, the mainstream solar panels on the market are mainly based on two material systems: crystalline silicon and thin film, each of which has significant technical advantages and market positioning.
Crystalline silicon solar panels are the mainstream choice in the current global market, and their core materials are high-purity single crystal or polycrystalline silicon wafers. Monocrystalline silicon panels achieve a conversion efficiency of 22%-25% with a perfect crystal structure, while polycrystalline silicon has a price advantage with a slightly lower efficiency of 20%-22%. Both have excellent weather resistance and a service life of more than 25 years. This material panel uses P-type or N-type semiconductor technology, and the surface is coated with an anti-reflection layer, and the internal laser etching process is used to optimize current conduction.
Thin-film solar cells show material innovation, and the mainstream technologies include amorphous silicon (a-Si), cadmium telluride (CdTe) and copper indium gallium selenide (CIGS). Amorphous silicon cells use vapor deposition technology to stack micron-sized silicon films on glass or flexible substrates, which have the characteristics of being rollable. CdTe and CIGS form multi-compound films on flexible substrates through chemical deposition or co-evaporation processes, which are particularly suitable for BIPV (building integrated photovoltaic) applications. Although thin-film cells have slightly lower efficiency (12%-18%), they have the advantages of low light response and lightweight.
From a cost-effectiveness perspective, crystalline silicon maintains its market dominance, while thin-film cells show competitiveness in special scenarios. The latest trends show that PERC (passivated emitter) and HJT (heterojunction) technologies are improving the efficiency of crystalline silicon, while perovskite-silicon stacked cells have broken through the 30% efficiency bottleneck. With the advancement of materials science, the performance of solar panels will continue to be optimized, providing core support for global energy transformation.