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MWT (Metal Wrap Through) solar battery and manufacturing method thereof

A technology for a solar cell and a manufacturing method, applied in the field of solar cells, can solve problems such as low photoelectric conversion efficiency, and achieve the effects of improving photoelectric conversion efficiency, reducing battery bending, and reducing electrical contact area

Active Publication Date: 2013-03-13
上饶捷泰新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in practical applications, it is found that the photoelectric conversion efficiency of conventional N-type solar cells is low

Method used

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  • MWT (Metal Wrap Through) solar battery and manufacturing method thereof
  • MWT (Metal Wrap Through) solar battery and manufacturing method thereof
  • MWT (Metal Wrap Through) solar battery and manufacturing method thereof

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Embodiment Construction

[0044] As described in the background art, the basic structure of an N-type solar cell in the prior art includes: a front electrode, an anti-reflection layer, a front surface field, an N-type substrate, a back emitter, a back field, and a back electrode. The photoelectric conversion efficiency of solar cells is low.

[0045] There are three main reasons for the above-mentioned shortcomings: 1. The structure of the aluminum back emitter of the N-type solar cell in the prior art makes the composite current of the solar cell larger; 2. The front electrode of the solar cell in the prior art includes the main grid Lines and sub-grid lines cause a large shading area on the surface of the solar cell; 3. In the prior art, the front surface field of the N-type solar cell covers the entire area of ​​the front surface of the substrate, resulting in more carrier recombination on the front surface of the solar cell .

[0046] Conventional MWT solar cells are Metal Wrap-Through solar cells. The...

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Abstract

The invention provides a manufacturing method of a MWT (Metal Wrap Through) solar battery. The method comprises the steps of: providing a substrate which comprises a body layer, a reflection-reducing layer and a passivation layer, wherein a plurality of through holes and openings are arranged on the substrate; forming conductive electrodes in the through holes and forming a first back contact electrode on the back of the substrate; forming second back contact electrodes in the openings; forming a touch grid line electrode on the front face of the substrate; sintering the substrate so that the touch grid line electrode is electrically connected with the conductive electrode; and forming a local front surface field in the front surface of the body layer; and forming a local back emitting electrode in the back surface of the substrate. The MWT solar battery manufactured by the method is small in composite current, large in light receiving area and high in photoelectric conversion efficiency, and the problem that the battery is bended is reduced. In addition, according to the manufacturing method provided by the invention, steps such as diffusive knot manufacture, edge corrosion, glass layer removal and secondary clean in conventional process are avoided, so that the manufacturing process flow is simplified and the production cost is reduced.

Description

Technical field [0001] The invention relates to the technical field of solar cells, in particular to a MWT solar cell and a manufacturing method thereof. Background technique [0002] Solar cells, also called photovoltaic cells, are semiconductor devices that directly convert the light energy of the sun into electrical energy. Because it is a green and environmentally friendly product, it will not cause environmental pollution, and it uses renewable resources, so in today's energy shortage situation, solar cells are a new type of energy with broad development prospects. [0003] One of the most important criteria to measure the electrical performance of a solar cell is its photoelectric conversion efficiency. The higher the photoelectric conversion efficiency of a solar cell, the stronger its ability to convert light energy into electrical energy. [0004] The structure of conventional N-type crystalline silicon solar cells, such as figure 1 As shown, from the front to the back of t...

Claims

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Application Information

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IPC IPC(8): H01L31/18H01L31/0224
CPCY02P70/50
Inventor 金井升许佳平黄纪德王单单蒋方丹
Owner 上饶捷泰新能源科技有限公司
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