Full-back-electrode solar cell structure and preparation method therefor

A solar cell, full-back electrode technology, applied in circuits, photovoltaic power generation, electrical components, etc., can solve the problems of complex process, rising series resistance, etc., and achieve the effect of avoiding compounding, maintaining fill factor, and reducing process steps

Inactive Publication Date: 2016-03-09
TRINA SOLAR CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although local openings reduce the area of ​​the metal contact area as a means, it does not eradicate the high recombination at the openings, and it makes the process more complicated and easily leads to an increase in series resistance

Method used

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  • Full-back-electrode solar cell structure and preparation method therefor

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Embodiment Construction

[0047] In order to make the content of the present invention more clearly understood, the present invention will be further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

[0048] Such as figure 1 As shown, a full back pole solar cell structure, it includes:

[0049] battery substrate 1;

[0050] a tunneling passivation layer 2, the tunneling passivation layer 2 is arranged on the back side of the battery substrate 1;

[0051] A polysilicon layer, the polysilicon layer is disposed on the lower surface of the tunnel passivation layer 2 , and the polysilicon layer has an N-type heavily doped polysilicon layer 31 and a P-type polysilicon layer 32 arranged side by side.

[0052] The full back pole solar cell structure also includes an electrode layer, the electrode layer is arranged on the lower surface of the polysilicon layer, and the electrode layer has a negative electrode 41 in contact with the N-type heavily doped...

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Abstract

The invention discloses a full-back-electrode solar cell structure and a preparation method therefor. The full-back-electrode solar cell structure comprises a cell substrate, a tunneling passivation layer, and a polycrystalline silicon layer, wherein the tunneling passivation layer is arranged on the back surface of the cell substrate; the polycrystalline silicon layer is arranged on the lower surface of the tunneling passivation layer; and the polycrystalline silicon layer is provided with an N type heavily-doped polycrystalline silicon layer and a P type polycrystalline silicon layer that are arranged side by side. According to the full-back-electrode solar cell structure, the silicon body is good in the surface passivation effect, and carriers can be selectively output, so that the efficiency of the full-back-electrode solar cell is improved.

Description

technical field [0001] The invention relates to an all-back electrode solar cell structure and a preparation method thereof. Background technique [0002] At present, solar photovoltaic is becoming the mainstream form of new energy in the future. With the continuous improvement of the industrial chain, the biggest challenge for the photovoltaic industry at present is how to reduce the manufacturing cost while improving the conversion efficiency of solar cells. As a kind of high-efficiency solar cell, the full-back solar cell has no grid electrodes on the front, and the positive and negative electrodes are on the back of the cell, which effectively reduces the front shading loss and improves the efficiency of the solar cell. At present, Trina Solar and the Australian National University have jointly developed a light-receiving area of ​​4cm 2 , Efficiency of 24.4% of the world record for all back solar cells. However, the process of all-back solar cells is complicated, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0224H01L31/0216H01L31/0352H01L31/18
CPCH01L31/0216H01L31/02167H01L31/0224H01L31/022441H01L31/0352H01L31/18Y02E10/50Y02P70/50
Inventor 端伟元王子港崔艳峰杨阳陈奕峰
Owner TRINA SOLAR CO LTD
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