Method for forming electrodes of IBC solar cell

Abstract

The invention relates to a method for forming electrodes of an IBC solar cell, and belongs to the technical field of electrodes of solar cells. The method for forming the electrodes of the IBC solar cell is mainly characterized in that primary printing and primary drying are carried out on a fine gate electrode of a positive electrode on the reverse side of the passivated IBC solar cell by using sizing agents, primary printing and primary drying are carried out on a fine gate electrode of a negative electrode on the reverse side by using sizing agents, and main gate electrodes are printed or secondary printing, secondary drying and sintering solidification are carried out on the fine gate electrode of the positive electrode and the fine gate electrode of the negative electrode at the same time when the main gate electrodes are printed. According to the method for forming the electrodes of the IBC solar cell, the machine investment of an IBC cell preparation technology is reduced, fine gates and main gates of the electrodes are separated, the sizing agents of different types are used, on the premise that the fine gate electrodes have good ohmic contact and the premise that the main gates have good weldability, the content of silver of the sizing agents of the main gates is reduced, and the cost is saved; the aspect ratio of each fine gate is increased, and on the premise that the printing sizing agents are used, it is ensured that the electric conductivity is close to or equal to the electric conductivity obtained by using an electrosilvering solution; the operation cost is reduced on the situation that the photoelectric conversion efficiency is ensured.

Description

technical field [0001] The invention relates to a method for forming an electrode of an IBC solar cell, belonging to the technical field of solar cell electrodes. Background technique [0002] Back contact solar cell (IBC Solar Cell) is a high-efficiency crystalline silicon solar cell, usually using n-type monocrystalline silicon as the substrate of the solar cell, with a photoelectric conversion efficiency of up to 24%, much higher than the current traditional crystalline silicon Solar cells and thin-film solar cells are currently recognized by the solar cell industry as the future direction of battery development. The emitter (pn node) and the back electric field of the IBC battery are on the back of the battery, so its positive and negative electrodes are also located on the back of the battery accordingly. [0003] Like ordinary crystalline silicon solar cells, electrodes are usually composed of fine grids and main grids. The former is the carrier collection and output...

AI Technical Summary

Problems solved by technology

[0004] IBC solar cells use a large amount of silver solution, and because of the need to use photolithography, mask deposition, electroplating and other processes and machines different from ordinary battery processes, the cost of the battery is high

On the other hand, since ordinary printing metal paste is not pure metal, its conductivity is not as high as that of electroplating solution, so if it is used, it will affect the photoelectric conversion efficiency of the battery

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