Production process of solar battery piece

Abstract

The invention discloses a production process of a solar battery piece, which can reduce the production cost and does not generate wastes in a production process. The process comprises the following steps: washing silicon, casting a silicon ingot, cutting a silicon wafer, detecting the silicon wafer, washing for the first time, diffusing to form nodes, washing for the second time, plating an antireflection film, carrying out silk-screen printing and rapidly sintering. All the wastes in a whole production process of the production process are sufficiently utilized so that environment-friendly and harmless production can be realized; various types of waste liquid, which are recycled, scrapped and out of work, and generated in the production process of the solar battery piece, and unqualified solar battery pieces which are produced in the production process are utilized, so that environmental pollution caused by the fact that a lot of waste liquid is discharged and the unqualified solar battery pieces are destroyed is avoided; and meanwhile, recycled silicon wafers, silver-coated copper powder, aluminum paste, recycled liquid and recycled sand can be directly supplied to a solar battery piece production line, so that the production cost of the solar battery piece is reduced. The production process is suitable for popularization and application in the field of solar batteries.

Description

technical field [0001] The invention relates to the field of solar cells, in particular to a production process of solar cells. Background technique [0002] With the rapid development of society and economy, the demand for energy is increasing day by day, the depletion of fossil energy and the pollution to the ecological environment are seriously threatening the sustainable development of society and economy. Therefore, there is an urgent need to replace it with renewable energy. As an inexhaustible and inexhaustible green renewable energy source, solar energy has received widespread attention worldwide. [0003] The principle of solar cells is mainly based on the semiconductor material silicon, and impurities are doped into the silicon crystal by means of a diffusion process: when impurities such as boron and phosphorus are doped, there will be a hole in the silicon crystal to form an n-type semiconductor; , after doping phosphorus atoms, there will be an electron in the...

AI Technical Summary

Problems solved by technology

[0023] The processing technology of the above-mentioned solar cells has the following problems in actual use: a large amount of acid-base waste liquid will be produced in the primary cleaning and secondary cleaning processes, quartz crucible waste will be produced in the silicon ingot casting process, and waste materials will be produced in the silicon wafer cutting process. During the process, a large amount of cutting mortar waste liquid will be produced. At present, most of these waste liquids are treated by acid-base neutralization and then discharged directly. It reduces the waste of raw materials, makes the production cost of solar cells higher, and also pollutes the environment, which is not environmentally friendly.

At the same time, a large number of unqualified solar cells will be produced due to various reasons in the production process of solar cells. Most of them adopt the method of centralized destruction. The main materials contained in solar cells are silicon, silver, aluminum, etc. Silicon, silver, and aluminum are all raw materials needed in the production process of solar cells. If unqualified solar cells are directly Destruction will not only cause a huge waste of raw materials, but at the same time, the battery residue after destruction will also pollute the environment, which is not environmentally friendly