Monocrystalline Silicon Cell Production Process
Author: Source: Datetime: 2016-10-04 11:30:00
The above three steps to obtain high-purity silicon are high energy consumption process, while the process of refining silicon metal also produces greenhouse gas two gasification of carbon. Fortunately, as long as PV cells are used in solar powered portable generator systems, the clean energy generated during their life cycle will greatly offset the side effects of fossil fuels that produce the same electrical energy. Single-crystal silicon from polycrystalline silicon generally use the famous pull single crystal process, that is, in a high vacuum single crystal furnace, the use of seed crystals from the melting of single-crystal silicon rods, the diameter of silicon rods represent the pull The level of technology. In the production of monocrystalline silicon rods at the same time can also be added in the molten silicon boron or arsenic to make.
In order to draw the voltage and current produced by the photovoltaic effect, an electrode must be formed on the battery. An electrode is a conductive material that forms a tight ohmic contact with a semiconductor material junction of a battery. The requirements of the photovoltaic cell electrode electrode material is stable, easy processing, good weldability, and silicon combination of close contact resistance and small. In the electrode design also requires the upper electrode shielding area is small, so the upper electrode material requires low resistivity. Electrode production generally use the screen printing method, that is, through the printing press and templates will be printed on the silver paste and aluminum paste in the solar powered portable generator is the back, and then baked and sintered electrode. The back electrode of the battery is relatively simple to manufacture, and a metal layer can be formed on the entire back surface. The positive electrode design of the battery should minimize the masking of the light-receiving surface, so the front electrode is generally comb-like, mesh.
The reflection loss rate of the light on the silicon surface is about 1/3. In order to reduce the silicon surface of the light reflection, but also the vacuum membrane or gas phase or other chemical method, in the prepared battery surface evaporation layer of silica or titanium dioxide or tantalum oxide antireflection coating. Silicon dioxide film which mature technology, production is simple, for the current production on the commonly used. It can improve the photovoltaic energy efficiency of the battery, increase the battery power output. Coated with an anti-reflective coating can reduce the reflectivity of human light to about 10%, while the two layers of anti-reflective coating can be reduced to reflectivity below 4%. Another way to reduce the reflectivity of the incident light is to use suede technology. The surface of the battery after the suede processing solar powered portable generator, an increase of the human radio light projection to the battery surface opportunity for the first time has not been absorbed by the refraction of light projected onto the solar power batteries surface of the other crystal surface may still be absorbed.
At this point the basic completion of the production of photovoltaic cells. Through the above process the reader can generally understand its structure. Film aging, cracking, discoloration of the reasons; the other film itself degradation, oxidation and residual crosslinking agent and the reaction between the anti-aging agent can also lead to yellowing of the film, transmittance decreased, the impact of photovoltaic cells Efficiency performance. The former photovoltaic cell processing industry is in urgent need of addressing this technology bottleneck or adopting new alternatives. Is a monodermal silicon photovoltaic cell structure having a suede antireflective surface and a contour of a solar power batteries. TAG: Nuon German Category Separate Telangana MW 10 Used Tax Guarantee Powertrain Automotive Experiment Research Deployment
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