Production process:
Slice, wash, prepare a suede, vicinity etching, remove PN + junction in the back, produce the upper and lower electrodes, produce less reflective film, sinter and test sub-file and other ten steps in the production of solar panels 500w.
 Specific description of the production process of solar panel
First of all, slice: take the multi-line cutting, and cut the silicon rods into square wafers. Second, cleaning: wash it with the cleaning method which is used in the conventional silicon wafer, and remove the damaged layer of 30-50um with an acid (or alkali) the solution of the wafer surface cutting. Third, Preparation of suede: conduct anisotropic etching on the silicon wafer surface with an alkaline solution to prepare suede. Fourth, phosphorus diffusion: take use of a coated source (or liquid source, or solid-state nitride phosphor sheet source) to complete the diffusion to made PN + junction and the junction depth is generally 0.3-0.5um. Fifth, surrounding etch: a diffusion layer is formed in the wafer peripheral surface when diffusion, which will cause the battery short-circuit of the upper and lower electrodes, and the masking wet etching or dry plasma etching are used to remove the surrounding diffusion layer. Sixth, remove the back PN + junction. Wet etching or grinding is commonly used to remove the back of the PN + junction. Seventh, produce the upper and base electrodes: vacuum depositions, electroless plating nickel or aluminum paste printing are used. Firstly, produce the base electrode, and then produce the upper electrode. Aluminum paste printing is the extensive use of technology. And solar module manufacturer pays a great deal of attention on this step.
Eighth, produce the reflective film: In order to reduce the reflection loss, a layer of the antireflection film has to be covered on the silicon surface. The materials used for the production of the antireflection coating are MgF2, SiO2, Al2O3, SiO, Si3N4, TiO2, Ta2O5, etc. The process methods can be a vacuum deposition method, an ion plating method, a sputtering method, a printing method, PECVD method or spraying method. Ninth, sintering: sinter the battery chip on the bottom plate of nickel or copper. Tenth, test sub-file: in accordance with the regulations parameter specification, test the classification. The process of the production of solar cells is more complex, it generally has gone through the major steps of silicon detection, surface texturing, and diffusion system junction to PSG, plasma etching, plating antireflection coating, screen printing, rapid sintering and detection repackaging.
www.solarmodulesystem.com was founded in 2006, which is a high-tech photovoltaic company. We specialize in the solar module, PV system project research, produce, sales and after sales service. Products get VDE. SGS. CE. CSA. MCS international certificates. From 10w~300w monocrystalline and polycrystalline solar panels pass test standard of IEC61215, IEC61730 & UL1703.
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