MWT heterojunction solar cell and preparation method thereof

A heterojunction battery and battery technology, applied in circuits, photovoltaic power generation, electrical components, etc., can solve the problems of reduced PN junction effective area, large PN junction failure area, and reduced battery efficiency, so as to improve the passivation effect and improve Effect of opening pressure, conversion efficiency, and area reduction
CN113113501APending Publication Date: 2021-07-13JIANGSU SUNPORT POWER CORP LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGSU SUNPORT POWER CORP LTD
Publication Date
2021-07-13

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Abstract

The invention discloses an MWT heterojunction solar cell and a preparation method thereof, the MWT heterojunction solar cell sequentially comprises a front conductive TCO layer, a front N-type doped amorphous silicon layer, a front intrinsic amorphous silicon layer, a monocrystalline silicon substrate, a back intrinsic amorphous silicon layer, a back P-type doped amorphous silicon layer and a back TCO conductive layer, the front surface is a textured structure, and the back surface is a polished surface. According to the preparation method of the cell provided by the invention, the special etching slurry for the TCO is used for insulating the conductive TCO between the positive electrode and the negative electrode of the back surface to replace laser insulation, so that the insulation effect is better, the electric leakage failure ratio is reduced, the yield is improved, the damage of laser insulation isolation to a silicon substrate can be avoided, and the open voltage and conversion efficiency of the MWT heterojunction cell are improved.
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Description

technical field

[0001] The invention relates to a MWT heterojunction solar cell suitable for mass production and a preparation method thereof, belonging to the field of silicon-based solar cell manufacturing. Background technique

[0002] MWT is a metal perforation and winding technology, which is applied in solar cells. It uses laser or other methods to realize the perforation process on the original silicon wafer, so as to achieve the purpose of leading the positive and negative electrodes to the same surface. The unique busbar-free design reduces the increase in the shading area. The current density of the battery can improve the conversion efficiency; the heterojunction silicon-based battery is a kind of high-efficiency photovoltaic battery, generally using N-type silicon wafer with high minority carrier life, combined with intrinsic amorphous silicon passivation layer and P-type amorphous silicon doped The heterogeneous PN junction structure is obtained for the heteroge...

Claims

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