Solar energy mono-crystalline silicon piece flocking solution and application method thereof

Abstract

The invention provides a solar energy mono-crystalline silicon piece flocking solution and an application method of the solar energy mono-crystalline silicon piece flocking solution. The flocking solution comprises the following components: 9.6 to 12.5g / L of NaOH, 50 to 100mL / L of ethanol, 0.25 to 2g / L of sodium ethoxide, 1 to 2g / L of vitamin, and one of 0.5 to 2.5g / L of at least one of potassium perfluoro alkyl ether carboxylate FC-5, polyoxyethylene ether, polyethylene glycol acid ester, polyol ester or lauroyl diethanol amine; and water and used as a solvent. A flocked face prepared by the method provided by the invention has good effect, pyramids of about 1-3 microns are fully and uniformly distributed on the flocked face, thus, little defect mode appears on the surface, the passivating effect of the flocked face is good, the minority carrier lifetime is prolonged, and the open-circuit voltage (Voc) (Variable Output Circuit), the short-circuit current (Isc) and a fill factor (FF) are correspondingly increased; the obtained pyramids are uniformly distributed in dimension and have no sharp edges and apex angles, therefore, the defect mode density on the surface can be greatly reduced, the passivating effect is improved, and the conversion efficiency of a solar cell can be increased.

Description

technical field [0001] The present invention relates to a texturing solution in the technical field of solar photovoltaic cells and an application method thereof, in particular to an alkali etching solution for wet etching the surface microstructure of solar monocrystalline silicon wafers and its application, which can obtain high minority carrier life method. Background technique [0002] Solar photovoltaic power generation is by far the cleanest and most promising power generation technology, and has important applications in many fields. Photovoltaic power generation is reliable and safe, without noise and pollution, and the energy can be said to be inexhaustible for a long period of time. Photovoltaic power generation has no geographical restrictions, does not need to consume fuel, is renewable, does not need to erect wires, has a low probability of failure, and is relatively simple to maintain. It can be combined with many households such as roofs and glass. At presen...

AI Technical Summary

Problems solved by technology

The effect of this kind of velvet liquid is not very good, the stability of velvet is not very good, the uniformity of the pyramid after velvet is not good, the pyramid on the surface has sharp edges and corners, and the number of children of this velvet surface is low. Lifespan is often not high

[0003] The main defect of the technology currently used in the industry is that the size of the pyramids on the surface of monocrystalline silicon made of lye is not uniform. The size of the large pyramids can reach 4-6 μm, and the size of the small pyramids is about 1 μm. Sharper edge angles

The sharp corners and edges have a very high defect state density, which is easy to form a minority carrier recombination center and reduce the minority carrier lifetime

During the passivation process, cracks are easily formed between the film and the silicon on the corners and edges of the pyramids, which reduces the passivation effect, and increases the electrode resistance and leakage current of the electrode, which is not conducive to improving the conversion efficiency of solar cells.

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