The essence of photovoltaic power generation is to convert light energy into electricity, so reducing optical loss and electrical loss are two key directions to improve the conversion efficiency of photovoltaic cells. The main reason for optical loss is the reflection and shading loss on the surface of the material, including the reflection on the front and back surfaces of the cell as well as the reflection of the module glass and the shading of the cell grid lines. Currently the main methods to reduce optical loss include:
1, the use of chemical methods of photovoltaic silicon wafer surface corrosion, the formation of velvet, increasing the role of light trapping;
2, photovoltaic preparation of reflection reduction film to reduce reflectivity, such as glass reflection reduction film, silicon nitride reflection reduction film on the surface of the battery;
3, optimization of photovoltaic cell grid line, reduce grid line shading loss, such as the use of multi-master grid and new high-efficiency XBC cell technology.
At present, in the field of photovoltaic flocking, anti-reverse film, multi-master grid and other technologies are now more widely used, the development of more mature, XBC battery technology is entering a rapid development stage, XBC battery PN junction and metal contacts are in the back of the battery, the front side of the impact of no metal electrode shielding, at the same time the back side of the wider metal grid line can be tolerated to reduce the series resistance and thus improve the fill factor.
Photovoltaic power generation electrical losses generated by the main reason is the photovoltaic cell in vivo and the surface of the compound of electrons and holes, the lower the compound rate, the higher the photoelectric conversion efficiency. Surface states on the cell surface (dangling bonds, impurities, lattice mismatches and damage layers, etc.) as well as impurities present inside the cell, which act as complex centers for carriers.
Photovoltaic power generation for solving the problems caused by the internal defects and impurities of the material itself, monocrystalline silicon is superior to polycrystalline silicon, and N-type batteries are superior to P-type batteries; for the composite centers on the surface of the cell, by changing the structure of the photovoltaic cell, such as the introduction of a passivation film (mainly Al2O3, SiNx), tunneling oxidation and doping of polycrystalline silicon layer, it can effectively prolong the life of internal oligons in the cell, and reduce the composite resulting in electrical losses.
With monocrystalline silicon wafers basically replacing polycrystalline silicon wafers and the passivation film technology represented by Al2O3 and SiNx in the previous PERC technology, the introduction of N-type wafer substrate in terms of materials and further strengthening of passivation effect in terms of cell structure (such as the introduction of tunneling oxidation and doped polysilicon layer) is a mature and effective way to further reduce the electrical losses, and the application of this technology can further reduce the electrical losses. The application of such improved materials and structural changes include new high-efficiency PV cell technologies such as TOPCon, XBC and HJT.
Boland Renewable Energy Co., LTD En tant que nouvelle société d'énergie intégrée, vous fournissant des solutions intégrées de haute qualité pour l'énergie éolienne, l'énergie solaire et le système de stockage d'énergie. Boland est maintenant une filiale de CRRC et est responsable de l'expansion à l'étranger de l'énergie éolienne de CRRC. & entreprise d'énergie solaire. Nous disposons d'une chaîne d'approvisionnement interne relativement complète, d'un réseau de service et d'une excellente qualité de produit et de technologie.
Boland fournit l'EPC de la centrale électrique, l'investissement et l'acquisition de la centrale électrique.
N'hésitez pas à nous contacter si vous avez besoin d'un support technique. Bravo pour notre coopération !
Mon email:marketing@boland-hydroturbine.com
WA:+8613923745989
