Research On Process Optimization Of Selective Emitter Multicrystal Solar Cell

Solar energy is very important to alleviate the increasingly serious energy crisis and environmental pollution what is a kind of clean and renewable energy. In recent years, the solar cell output growth with unprecedented speed, and the polycrystalline silicon solar cell occupy the major market. Conventional polycrystalline solar cell efficiency is affected by cell structure, and there are low efficiency and high cost problems in real production. Therefore, a new type of polycrystalline silicon solar cell structure selective emitter (SE) application appears to improve the conversion efficiency and reduce costs. A complishments in this thesis is listed below: First of all, study on crystalline silicon solar cell technology of SE, physical model, structural parameters and performance on the basis of understanding the solar cell and principle.Secondly, the conventional polycrystalline silicon solar cell structure is affected by surface concentration and junction depth:diffusion requires low doped to reduce minority carrier recombination, but contact resistance is increased by low doped so that it is difficult to form good ohmic contact. Therefore, it limits the conversion efficiency of polycrystalline silicon solar cell. Selective emitter (SE) technology can resolve the problem, such as heavily doped in the electrode contact region and low doped in the light of region. This thesis deeply research on SE of polycrystalline silicon solar cell, optimize the process parameters, the photoelectric conversion efficiency has been significantly improved, the level of industrial production of polysilicon solar cells is up to17.60%.Finally, this thesis put forward the optimization and development direction of selective emitter technology, hopes to further enhance the conversion efficiency and reduce the manufacturing cost, the early realization of wide application of clean energy.We can reach conclusions based on experimentation and analysis that average conversion efficiency is improved to0.6%and the product cost is reduced to0.5%.