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Back contact solar cell string and preparation method thereof, component and system

A technology for solar cells and back-contact cells, applied in the field of solar cells, can solve the problems of difficult alignment and welding of cells, large number of emitter and base electrodes, and large power loss, so as to reduce lateral transmission loss and improve filling factor. , The effect of saving the cost of silver paste

Active Publication Date: 2017-05-10
TAIZHOU ZHONGLAI PHOTOELECTRIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the previous manufacturing process of back-contact solar cells, the metallization process was mostly realized by electroplating with a relatively complicated process. The process is complicated, and the discharged waste seriously pollutes the environment, and is incompatible with the mainstream metallization method of current industrial production, so it is not conducive to the promotion of low-cost industrialization
At the same time, in the process of packaging back-contact cells into modules, due to the large number of emitter and base electrodes and the narrow line width, alignment welding between adjacent cells is very difficult
On the other hand, in the process of packaging batteries into components, a large part of the power loss comes from welding resistance and ribbon resistance. The higher the short-circuit current of a single battery, the greater the power loss.

Method used

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  • Back contact solar cell string and preparation method thereof, component and system
  • Back contact solar cell string and preparation method thereof, component and system
  • Back contact solar cell string and preparation method thereof, component and system

Examples

Experimental program
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Effect test

Embodiment 1

[0050] A method for preparing a back-contact solar cell string in this embodiment includes the following steps:

[0051] (1) Prepare a back-contact solar cell in which emitter p+ regions 10 and base n+ regions 11 are alternately arranged on the back surface of a silicon wafer. In this embodiment, an N-type single crystal silicon substrate is selected, and the resistivity is 1-30Ω·cm. The thickness is 50-300μm, and the N-type crystalline silicon substrate is subjected to surface texture treatment before use, and then the emitter p+ region 10 and the base n+ region 11 are alternately arranged by using diffusion or ion implantation, masking, etching and other technologies on the back surface of the battery. Then use dielectric films such as silicon oxide, silicon nitride and aluminum oxide to passivate the back surface of the battery, passivate the front surface and optical antireflection, so as to form the required emitter p+ regions 10 and base n+ regions 11 alternately Solar ...

Embodiment 2

[0058] A method for preparing a back-contact solar cell string in this embodiment includes the following steps:

[0059] Steps (1)-(3) and (5) are the same as those in Embodiment 1, and will not be repeated here.

[0060] (3)', print solder paste on the emitter segment electrode 20 of the narrow strip-shaped back contact battery after step 3 to form the emitter thermosensitive conductive layer 30, and print solder paste on the base segment electrode 21 to form the base thermally sensitive conductive layer 31 . The overink pattern of solder paste can be circular or linear. Its width cannot exceed the width of the doped region in which it is located. During printing, the emitter thermally sensitive conductive layer 30 after ink must be located on the emitter segment electrode 20 , and the base thermally sensitive conductive layer 31 after ink is located on the base segment electrode 21 . The enlarged picture of the local structure after printing is as follows Figure 6 As sh...

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Abstract

The invention relates to a back contact solar cell string and preparation method thereof, a component, and a system. The back contact solar cell string comprises a back contact solar cell and a conductive part electrically connected with the back contact solar cell; an emitter segmented electrode of an emitter p+ region and the segmented electrode of a base n+ region are arranged on the back surface of the segmented electrode of the emitter; an emitter metal wire electrode is arranged on the emitter segmented electrode, a base metal wire electrode is arranged on the base segmented electrode, the emitter metal wire electrode and the base metal wire electrode reversely extend out a battery piece; the emitter metal wire electrode of the back contact solar cell is electrically connected with the base metal wire electrode of an adjacent back contact solar battery through the conductive piece. The back contact solar cell string disclosed by the invention has the advantages that the operation is simple, the high-precision welding equipment alignment is unnecessary, the horizontal transmission loss of the carrier between the electrodes is reduced, a fill factor of the cell is improved, the short-circuit current of the component is lowered, thereby obviously lowering the component encapsulation loss.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a back-contact solar cell string and a preparation method, component and system thereof. Background technique [0002] A solar cell is a semiconductor device that converts light energy into electrical energy. Lower production costs and higher energy conversion efficiency have always been the goals pursued by the solar cell industry. For conventional solar cells at present, the emitter contact electrode and the base contact electrode are respectively located on the front and back sides of the battery sheet. The front of the battery is the light-receiving surface, and the coverage of the metal emitter contact electrode on the front will inevitably cause a part of the incident sunlight to be reflected and blocked by the metal electrode, resulting in a part of optical loss. The coverage area of ​​the front metal electrode of an ordinary monocrystalline silicon solar cell is abou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0224H01L31/05H01L31/18
CPCH01L31/022441H01L31/0516H01L31/18H01L31/0682H01L31/1804Y02E10/547Y02P70/50
Inventor 李建伟刘志锋季根华章康平刘勇
Owner TAIZHOU ZHONGLAI PHOTOELECTRIC TECH CO LTD
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