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PERC (Passivated Emitter and Rear Contact) solar cell

A technology for solar cells and back electrodes, applied in the field of solar cells, can solve the problems of only front power gain at the component end, unable to achieve power gain, large consumption of printing aluminum paste, etc., to improve cell conversion efficiency, reduce contact recombination, The effect of reducing battery costs

Inactive Publication Date: 2016-10-26
CSI CELLS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This structure has the following problems: (1) The aluminum paste printed on the whole surface consumes a lot, the battery cost is high, and the battery sheet is easy to bend; (2) the BSF formed by sintering is shallow, the contact recombination is large, and the open circuit voltage is low; (3) There is only positive power gain at the component side, and power gain cannot be maximized

Method used

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  • PERC (Passivated Emitter and Rear Contact) solar cell
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  • PERC (Passivated Emitter and Rear Contact) solar cell

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Effect test

Embodiment 1

[0038] see Figure 3~4 As shown, a PERC solar cell includes a silicon wafer layer 1 with a PN junction, and a passivation layer (composed of an aluminum oxide layer 2 and a silicon nitride film layer 3) and an aluminum metal layer sequentially arranged on the back of the silicon wafer layer 4; the passivation layer and the silicon nitride film layer are provided with an opening area 5; the back side of the solar cell is provided with a back electrode 6;

[0039] The aluminum metal layer partially covers the back side of the silicon wafer, and the aluminum metal layer covers all of the passivation layer and the opening area on the silicon nitride film layer;

[0040] In terms of the plane where the silicon wafer is located, the position of the back electrode does not coincide with the position of the opening area.

[0041] The area covered by the aluminum metal layer accounts for 80% of the backside area of ​​the silicon wafer. The aluminum metal layer is distributed in strip...

Embodiment 2

[0045] see Figure 5~6 Shown, a kind of PERC solar cell comprises the silicon slice layer with PN junction, and the passivation layer, silicon nitride thin film layer and aluminum metal layer 4 that are arranged on the backside of silicon slice layer successively; The passivation layer and nitride An opening area is provided on the silicon film layer; a back electrode 6 is provided on the back of the solar cell;

[0046] The aluminum metal layer partially covers the back side of the silicon wafer, and the aluminum metal layer covers all of the passivation layer and the opening area on the silicon nitride film layer;

[0047] The back electrode 6 is in direct contact with the non-opening area of ​​the passivation layer, see Figure 6 shown.

[0048] In terms of the plane where the silicon wafer is located, the position of the back electrode does not coincide with the position of the opening area.

[0049]The area covered by the aluminum metal layer accounts for 60% of the ba...

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Abstract

The invention discloses a PERC (Passivated Emitter and Rear Contact) solar cell. The PERC solar cell comprises a silicon wafer layer with a PN junction, and a passivation layer and a metal layer which are arranged in sequence on a back side of the silicon wafer layer, wherein the passivation layer is provided with an open area; the surface of the solar cell is provided with a back electrode; and based on a plane on which a silicon wafer is positioned, the position of the back electrode does not coincide with the position of the open area. The position of the back electrode does not coincide with the position of the open area, so that compounding between metal and naked silicon on an opening is reduced, and an open voltage of the cell is increased. As proved by experiments, compared with an existing structure, the structure of the PERC solar cell has the advantages that the cell conversion efficiency can be increased by 0.1 percent, and an unexpected effect is achieved.

Description

technical field [0001] The invention relates to a PERC solar cell, which belongs to the technical field of solar cells. Background technique [0002] Conventional fossil fuels are being exhausted day by day. Among the existing sustainable energy sources, solar energy is undoubtedly the cleanest, most common and most potential alternative energy source. Solar power generation devices, also known as solar cells or photovoltaic cells, can directly convert solar energy into electrical energy. The principle of power generation is based on the photovoltaic effect of semiconductor PN junctions. [0003] With the development of science and technology, partial contact back passivation (PERC) solar cells have emerged, which is a newly developed high-efficiency solar cell and has attracted widespread attention in the industry. Its core is to cover the backlight surface of the silicon wafer with an aluminum oxide or silicon oxide film (5-100 nanometers) to passivate the surface and imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0224H01L31/068
CPCH01L31/02245H01L31/068Y02E10/547
Inventor 侯利平王栩生邢国强
Owner CSI CELLS CO LTD
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