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PERC battery based on point contact and composite film layer

A composite film layer and point contact technology, which is applied in the field of solar cells, can solve the problems of difficulty in improving the double-sided factor of double-sided PERC cells, high inactive doping concentration, and difficulty in improving efficiency, so as to improve the double-sided factor and the back of the battery. Efficiency, high cell efficiency, reducing the effect of heavily doped region area and front electrode shading area

Pending Publication Date: 2021-04-30
湖南红太阳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

However, the square resistance of the heavily doped region is 60-90Ω / sq, the inactive doping concentration is high, and the quantum efficiency of this region is low
[0008] To sum up, the current efficiency improvement of PERC cells has reached the bottleneck period, and it is difficult to improve the efficiency, and it is also difficult to improve the bifacial factor of double-sided PERC cells.

Method used

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  • PERC battery based on point contact and composite film layer
  • PERC battery based on point contact and composite film layer
  • PERC battery based on point contact and composite film layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A kind of PERC battery based on point contact and composite film layer of the present invention, specifically single-sided point contact PERC battery (DC-PERC), such as figure 1 As shown, including a P-type silicon substrate 1, the front of the P-type silicon substrate 1 is provided with an N+ emitter layer 2 and a front composite film layer from the inside to the outside, and the front composite film layer includes a front silicon dioxide layer 3 arranged in sequence from the inside to the outside. , the front silicon nitride layer 4 and the front TCO layer 5, the N+ emitter layer 2 is provided with a silver dot array structure, the silver dot array structure passes through the front silicon dioxide layer 3, and the front silicon nitride layer 4 extends to the front TCO layer 5, the N+emitter layer 2 is provided with an N++ heavily doped region 7 at the position corresponding to the silver point 6, the silver point 6 is in contact with the N++ heavily doped region 7, an...

Embodiment 2

[0056] A kind of PERC battery based on point contact and composite film layer of the present invention, specifically double-sided point contact PERC battery (BDC-PERC), such as Figure 6 As shown, including a P-type silicon substrate 1, the front of the P-type silicon substrate 1 is provided with an N+ emitter layer 2 and a front composite film layer from the inside to the outside, and the front composite film layer includes a front silicon dioxide layer 3 arranged in sequence from the inside to the outside. , the front silicon nitride layer 4 and the front TCO layer 5, the N+ emitter layer 2 is provided with a silver dot array structure, the silver dot array structure passes through the front silicon dioxide layer 3, and the front silicon nitride layer 4 extends to the front TCO layer 5, the N+emitter layer 2 is provided with an N++ heavily doped region 7 at the position corresponding to the silver point 6, the silver point 6 is in contact with the N++ heavily doped region 7, ...

Embodiment 3

[0069]A kind of PERC battery based on point contact and composite film layer of the present invention, specifically double-sided point contact PERC battery (BDC-PERC), the structure of the battery is basically the same as that of Example 2, the only difference is that the back electrode 13 is made of back silver Electrodes 15, main grid lines 16 and auxiliary grid lines 17 arranged perpendicularly to each other are composed of main grid lines 16 being silver main grid lines, auxiliary grid lines 17 being silver auxiliary grid lines, nine silver main grid lines, and silver main grid lines The width of the silver sub-grid is 1.2 mm, the width of the silver sub-grid line is 30 μm, and the distance between adjacent silver sub-grid lines is 1.2 mm.

[0070] The relevant parameters of the PERC battery (BDC-PERC battery) based on point contact and composite film layer in this example, the BDC-PERC battery in Example 2, and the conventional double-sided PERC battery were compared, and ...

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Abstract

The invention discloses a PERC battery based on point contact and a composite film layer, and the battery comprises a P-type silicon substrate, the front surface of the substrate is provided with an N + emitter layer, a front surface silicon dioxide layer, a front surface silicon nitride layer and a front surface TCO layer from the inside to the outside, the N + emitter layer is provided with a silver point array structure, and the N + emitter layer is provided with an N + + heavily doped region. The silver points are in contact with the N + + heavily doped region, a front electrode is arranged on the front TCO layer, a back aluminum oxide layer, a back silicon nitride layer and an aluminum back field layer are arranged on the back of the P-type silicon substrate from inside to outside, or the back comprises a back aluminum oxide layer, a back silicon nitride layer and a back TCO layer from inside to outside, an aluminum point array structure is arranged on the back P-type silicon substrate and the back electrode is arranged on the back TCO layer. The PERC battery has the advantages that the electrode shading area and the heavily doped region area can be greatly reduced, the carrier recombination is reduced, the saturated dark current density is improved, the battery efficiency is improved, and the like.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and relates to PERC cells based on point contacts and composite films, in particular to PERC cells based on single-sided point contacts and composite films and PERC cells based on double-sided point contacts and composite films. Background technique [0002] Solar cell efficiency losses mainly include optical loss, recombination loss and electrical loss, and optical loss is divided into light reflection loss (surface reflection and electrode shading), light transmission loss (light escape) and light loss in invalid bands. Recombination loss consists of contact recombination loss, surface recombination loss, interfacial recombination loss and bulk recombination loss. The electrical loss is mainly caused by the series resistance loss of the electrode, electrode and silicon contact, emitter, bulk phase, back contact and back electrode. [0003] PERC battery is a mainstream product in the photov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0216H01L31/0224H01L31/068
CPCH01L31/022433H01L31/022441H01L31/02167H01L31/068Y02E10/547
Inventor 周塘华易辉马刚刘照周祥罗侃
Owner 湖南红太阳新能源科技有限公司