2025.08.08
1. Light Trapping Structure. High-efficiency monocrystalline silicon cells are typically textured using chemical etching, achieving a reflectivity of less than 10%. Currently, the most advanced texturing technology is reactive plasma etching (RIE). This technology is independent of the crystal orientation of the silicon and is suitable for thinner monocrystalline silicon solar panels.
2. Anti-reflection Coating. Its basic principle is that a film with a certain refractive index, applied to the dielectric and cell surfaces, causes the various levels of reflection generated by the incident light to interfere with each other, thereby completely canceling out the reflections. Vapor-depositing an anti-reflection coating on the textured cell surface can reduce the reflectivity to approximately 2%.
3. Passivation Layer: The passivation process effectively reduces the recombination of photogenerated carriers in certain areas. High-efficiency solar cells are typically passivated using thermal oxygen passivation, atomic hydrogen passivation, or surface diffusion of phosphorus, boron, or aluminum. Thermal oxygen passivation forms a silicon oxide film on the front and back surfaces of the cell, effectively preventing carrier recombination at the surface. Atomic hydrogen passivation occurs because the silicon surface has numerous dangling bonds, which serve as effective carrier recombination centers. Atomic hydrogen can neutralize these bonds, thereby reducing recombination.
4. Increasing the back field: For example, in a P-type solar cell, adding a heavily doped P+ layer to the back surface creates a P+/P structure. This generates a built-in electric field at the P+/P interface, directing from the P region toward the P+ region. The accumulation of photogenerated carriers separated by this built-in electric field creates a photovoltage with the P+ terminal as positive and the P terminal as negative. This photovoltage has the same polarity as the photovoltage across the PN junction of the crystalline silicon solar panel structure, thereby increasing the open-circuit voltage (Voc). Furthermore, the presence of the back field accelerates photogenerated carriers, which can be considered as increasing the effective diffusion length of the carriers, thereby increasing the probability of collecting these minority carriers and improving the short-circuit current (Jsc).
5. Improving the substrate material: Select high-quality silicon materials, such as N-type silicon, which exhibits long carrier lifetimes, minimal boron-oxygen reactions after junction formation, excellent conductivity, and low saturation current.
Keywords：
Sun Earth Solar, Ningbo Sun Earth, Sun-Earth, Sun Earth, solar panels
