Manufacturing method for double-face illuminated crystalline silicon solar cell

Abstract

The invention discloses a manufacturing method for a double-face illuminated crystalline silicon solar cell. The method comprises the following steps of: (1) washing a raw silicon chip, and removing a damaged layer from the back face of the raw silicon chip; (2) performing single-face boron diffusion on the front face of the silicon chip in a back-to-back way, wherein the back face of the silicon chip is a diffusing face; (3) depositing a mask layer on the back face of the diffused silicon chip; (4) washing the front face of the silicon chip, removing a damaged layer, performing texturing, and removing a diffraction diffusion layer; (5) performing single-face phosphorus diffusion on the back face of the silicon chip in a back-to-back way, wherein the front face of the silicon chip is the diffused face; (6) removing a peripheral joint, impurity glass and a mask which are formed by the diffusion; (7) depositing an anti-reflection coating on each of the two faces of the silicon chip; and (8) printing a metal electrode on each of the two faces of the silicon chip, and performing sintering to obtain the double-face illuminated crystalline silicon solar cell. The influence of diffraction on the electrical properties of the cell is avoided, and the photoelectric efficiency of the cell can be improved by 0.3 to 0.5 percent; and the method has positive practical significance.

Description

technical field [0001] The invention relates to a preparation method of a double-sided light-receiving type crystalline silicon solar cell, which belongs to the field of solar cells. Background technique [0002] Conventional fossil fuels are increasingly depleted. Among all sustainable energy sources, solar energy is undoubtedly the cleanest, most common and most potential alternative energy source. At present, among all solar cells, crystalline silicon solar cells are one of the solar cells that have been widely commercialized. This is due to the extremely abundant reserves of silicon materials in the earth's crust. Cells have excellent electrical and mechanical properties, therefore, crystalline silicon solar cells occupy an important position in the field of photovoltaics. [0003] Traditional crystalline silicon solar cells are generally single-sided light-receiving type, and the back is an all-aluminum back field. The disadvantage is that the surface recombination rat...

AI Technical Summary

Problems solved by technology

[0003] Traditional crystalline silicon solar cells are generally single-sided light-receiving type, and the back is an all-aluminum back field. The disadvantage is that the surface recombination rate of the aluminum back field is high, which greatly restricts the improvement of efficiency; After the field battery is packaged, the heat dissipation is poor, and it is easy to reduce the efficiency due to the temperature rise in the working process

Moreover, the method of separately masking both sides needs to increase the corresponding cleaning process, which makes the whole process more complicated.

Images