Efficient passivation structure battery and preparation method thereof

Abstract

The invention relates to the technical field of solar batteries, and discloses an efficient passivation structure battery and a preparation method thereof in order to solve the problems of poor compactness and thickness uniformity of a passivation film in the prior art. The efficient passivation structure battery comprises P-type crystalline silicon, two positive electrodes arranged on the front surface of the P-type crystalline silicon and two negative electrodes arranged on the back surface of the P-type crystalline silicon, wherein a SiO2 layer is arranged on the back surface of the P-type crystalline silicon, and a Ga2O3 / AlN / Ta2O5 laminated passivation film is arranged on the SiO2 layer. According to the invention, the SiO2+Ga2O3 / AlN / Ta2O5 laminated passivation film, silicon oxynitride and the silicon nitride composite passivation film are adopted on the back surface, the efficiency is improved through a battery end, the fixed negative charge density of each layer of the Ga2O3 / AlN / Ta2O5 laminated passivation film is different and is lower than that of aluminum oxide, the adverse effect caused by positive charge reduction passivation can be relieved while the passivation effect is ensured through multi-layer superposition, and PID is improved.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a high-efficiency passivation structure cell and a preparation method thereof. Background technique [0002] At present, aluminum oxide is usually used as the passivation layer on the back of PERC cells, and its fixed negative charge density provides an excellent effect for field passivation, so that the cell efficiency can be guaranteed. However, in the actual power generation application process, it is often found that the efficiency of the battery is reduced due to the failure of the passivation film, which in turn affects the power output of the subsequent terminal components. In order to ensure the efficiency of the battery and the stable output of the module power, the battery terminal is currently x Membrane layer design, high density POE material at the module end, low Na + Glass, etc. have been improved, but it still shows problems such as component reliability fai...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of passivation film compactness and poor thickness uniformity, problems such as efficiency failure often occur, and the problems existing at the component end due to the PID effect, and provide a high-efficiency passivation structure battery and its preparation method. The present invention It is planned to increase the efficiency and improve the PID effect on the battery side, and use SiO on the back side 2 + Ga 2 o 3 / AlN / Ta 2 o 5 Laminated passivation film+silicon nitride+silicon oxynitride+silicon nitride composite passivation film improves efficiency through the battery side, the Ga 2 o 3 / AlN / Ta 2 o 5 The fixed negative charge density of each layer of the laminated passivation film is different, and they are all lower than aluminum oxide. The multi-layer stacking can ensure the passivation effect, and at the same time, it can alleviate the negative image caused by the positive charge reduction passivation and improve the PID.

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