MWT and passivation combined crystal silicon solar cell and manufacturing method thereof

Abstract

The invention discloses an MWT and passivation combined crystal silicon solar cell and a manufacturing method thereof. The crystal silicon solar cell comprises a passivating film, a phosphorus diffusion layer, a P-type silicon substrate, an aluminum oxide film, a laminated protective film and an aluminum printing layer structure which are sequentially superposed, and a through-hole silver electrode penetrates the crystal silicon solar cell. The manufacturing method of the crystal silicon solar cell comprises the steps of drilling, flocking, diffusing, polishing, film growth, tapping, hole filling, printing, sintering and the like. The MWT and passivation combined crystal silicon solar cell has the advantages of being low in cost and capable of being produced in a mass mode.

Description

technical field

[0001] The invention relates to a structure and a manufacturing method of a solar cell, in particular to a crystalline silicon solar cell combined with MWT and back passivation and a manufacturing method thereof. Background technique

[0002] The industrial production of modern solar cells is developing towards high efficiency and low cost. The combination of MWT (Metal wrap through) technology and rear passivation (PERC) technology, as a representative of the development direction of high efficiency and low cost, has the following advantages:

[0003] (1) Very low front shading: MWT technology leads the busbar to the back of the battery by drilling holes in the silicon wafer, thereby reducing the shading of the metal electrodes on the sun-facing side of the battery;

[0004] (2) Excellent back reflector: Due to the existence of the dielectric film on the back of the battery, the internal back reflection increases from 65% of the conventional all-aluminum bac...

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