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Solar cell backboard with down-conversion function and preparation method thereof

A technology for solar cells and conversion functions, applied in the field of solar cells, can solve problems such as waste of ultraviolet light, and achieve the effects of avoiding degradation and damage and improving power generation efficiency.

Pending Publication Date: 2021-08-27
ZHONGTIAN PHOTOVOLTAIC MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the three methods can effectively block or absorb ultraviolet light, ultraviolet light cannot be effectively used by silicon cells to improve the efficiency of silicon cells, resulting in waste of ultraviolet light

Method used

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  • Solar cell backboard with down-conversion function and preparation method thereof

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preparation example Construction

[0046] The preparation method of other combined rare earth compounds is the same as the above method, only need to change the raw materials.

[0047] A UV absorber is added to the reflective layer 5 of the PEVE film for absorbing the ultraviolet light that is not absorbed by the fluorescent layer 6 of the PEVE film but penetrates into the reflective layer 5 of the PEVE film. At the same time, the reflective layer 5 of the PEVE film is bonded to the fluorescent layer 6 of the PEVE film and the first adhesive layer 4 at the same time.

[0048] The specific working method of the present invention is that when the silicon solar photovoltaic module is working, part of the ultraviolet rays will pass through the cells or the gap between the cells and reach the inner film of the photovoltaic backplane. When this part of the ultraviolet rays reaches the PEVE film fluorescent layer 6, part of the ultraviolet rays will The light will be absorbed by the rare earth compound fluorescent mat...

Embodiment 1

[0057] Embodiment 1: the present invention provides a kind of solar cell back plate with down-conversion function, comprises the inner layer film (composite PEVE film layer comprises PEVE film fluorescent layer 6 and PEVE film light-reflecting layer 5 that is arranged in sequence, in PEVE film fluorescent layer 6 Doped with rare earth compounds, the rare earth compound is NaLuF 4 doped Ho 3+ , Yb 3+ ), the first adhesive layer 4 (polyurethane adhesive), the base film 3 (PET), the second adhesive layer 2 (polyurethane adhesive) and the outer film 1 (polyvinyl fluoride film).

[0058] Wherein the preparation of PEVE film layer comprises the following steps:

[0059] (1) With the raw materials needed for the PEVE film fluorescent layer 6, polyethylene (molecular weight 2,000,000) is 110 parts, polypropylene (molecular weight 800,000) is 130 parts, and crosslinking agent (dicumyl peroxide) is 0.7 part , the silane coupling agent (orthosilicate ethyl ester) is 0.7 parts, the lig...

Embodiment 2

[0065] Embodiment 2 The present invention provides a solar cell backboard with down-conversion function and its preparation method, which is basically the same as Embodiment 1, except that the rare earth compound in the fluorescent layer 6 of the EVE film adopts NaLuF 4 Doped with Ce 3+ , Yb 3+ .

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Abstract

The invention relates to a solar cell backboard with a down-conversion function, and the backboard comprises an inner layer film, a first adhesive layer, a base layer film, a second adhesive layer and an outer layer film which are arranged in sequence; the inner layer film is a PEVE film layer with a double-layer structure, the PEVE film layer comprises a PEVE film fluorescent layer and a PEVE film reflective layer, the PEVE film fluorescent layer is doped with a rare earth compound with a down-conversion function, which is converted into near-infrared light. The inner layer film is arranged to be the PEVE film layer of the double-layer structure, the PEVE film layer comprises the PEVE film fluorescent layer doped with the rare earth compound with the down-conversion effect and the PEVE film reflective layer, and due to the fact that the rare earth compound fluorescent agent with the quantum cutting effect is added into the PEVE film fluorescent layer, high-energy ultraviolet light can be absorbed; high-energy ultraviolet light rays are converted into low-energy near-infrared light which can be absorbed by the silicon cell in a quantum cutting mode, so degradation damage of the photovoltaic back plate caused by irradiation of the ultraviolet light rays is avoided, and the power generation efficiency of the silicon cell is also improved.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and in particular relates to a solar cell back plate with a down conversion function and a preparation method thereof. Background technique [0002] As an important part of solar photovoltaic modules, the solar cell backsheet plays an irreplaceable role in supporting, protecting, and improving the power generation of solar cells. Sunlight is generally divided into high-energy ultraviolet light, medium-energy visible light and low-energy infrared light. For silicon solar cells, since the energy band gap is 1.12ev, they can generally only absorb near-infrared sunlight with a wavelength of about 980nm, while high-energy solar cells The ultraviolet light is hardly used. [0003] As a kind of high-energy sunlight, ultraviolet light has a strong destructive effect on the photovoltaic backplane when it is irradiated. At present, the treatment of ultraviolet light generally includes three aspects: ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/049H01L31/055H01L31/18B32B7/023B32B7/12B32B27/08B32B27/20B32B27/32B32B33/00
CPCH01L31/049H01L31/055H01L31/18B32B27/08B32B27/32B32B27/20B32B7/12B32B33/00B32B7/023B32B2250/24B32B2255/10B32B2307/70B32B2457/10Y02E10/52
Inventor 徐征阳周晨丽
Owner ZHONGTIAN PHOTOVOLTAIC MATERIALS
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