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Solar cell packaging adhesive film with high light conversion efficiency

A technology of solar cells and conversion efficiency, applied in photovoltaic power generation, circuits, adhesives, etc., can solve the problems of narrow absorption band of rare earth ions, complex preparation process, low absorption coefficient, etc., and achieve high utilization efficiency and good photostability. Effect

Active Publication Date: 2015-09-23
HANGZHOU FIRST APPLIED MATERIAL CO LTD
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  • Abstract
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Problems solved by technology

However, the absorption coefficient of rare earth ions themselves is not high, that is, the quantum efficiency of luminescence is low, and it is often necessary to coordinate with an organic ligand. For example, Chinese patent CN103237865A discloses a spherical phosphor containing a rare earth ion-organic complex, which can improve The power of solar cells, but organic ligands, as energy transfer groups, still have the problem of yellowing under long-term ultraviolet irradiation, and the absorption band of rare earth ions is also narrow
Semiconductor quantum dots have good photostability, absorption bandwidth, and the advantages that the emission spectrum can be adjusted according to the size of quantum dots in the range of 500-1100nm have attracted the attention of scholars. For example, Chinese patent CN101567406A discloses a CdS or CdTe quantum dot containing Silica sol, which can be coated on the surface of silicon-based solar cells to form a light conversion layer, but its preparation process is more complicated
The photo-converting substances reported in the above-mentioned patents and materials only involve the down-shift function, that is, converting short-wave ultraviolet light into visible light or near-infrared light, but have no conversion effect on near-infrared light greater than 1100nm in the solar spectrum. , so 20% of the energy in AM1.5 is wasted
[0005] Chinese patent CN103709946A discloses an EVA adhesive film containing a rare earth metal-organic complex, which has the functions of ultraviolet down-conversion and near-infrared up-conversion, but its preparation method is to carry out EVA and rare earth metal-organic complexes in an organic solvent. Dispersion compounding, film formation after drying, which is not realistic for industrial production

Method used

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  • Solar cell packaging adhesive film with high light conversion efficiency

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preparation example Construction

[0021] The method for preparing semiconductor quantum dots is a common method for those skilled in the art.

[0022] The size of the semiconductor quantum dots must be in a quantum confinement state, that is, less than 10nm. Based on the maximum utilization of the spectrum in the range of 300-500nm, that is, the widest absorption band, the standard deviation of the size distribution of the quantum dots is less than 30% of the average size and greater than 10% of the average size. If the standard deviation is too small, it means that the size of the quantum dots is too concentrated, resulting in a narrow absorption band. If the standard deviation is too large, it means that the size of the quantum dots is too dispersed, which will cause the absorption coefficient of each specific wavelength to decrease. The emission spectrum of the semiconductor quantum dots can be adjusted by the type and size of the quantum dots in the range of 500-1100 nm.

[0023] In order to make the sem...

Embodiment 1

[0055] Si quantum dots with an average size of 5 nm and a standard deviation of 0.5 nm were surface treated with acrylic.

[0056] 20% Er 3+ Doped inorganic phosphor (the structural formula is expressed as NaY 0.8 f 4 :Er 3+ 0.2 ) is surface-coated with polymethyl methacrylate.

[0057] In terms of parts by mass, 100 parts of EVA with VA content of 30wt%, 2 parts of Si quantum dots through surface treatment, and NaY coated on the surface 0.8 f 4 :Er 3+ 0.2 1 part, 1 part of tert-butylperoxycaprylydecanoic acid, 0.5 part of trimethylolpropane trimethacrylate, 0.2 part of vinyltrimethoxysilane, 2,4-dichloro-6-(4-morpholine base)-1,3,5-triazine 0.1 parts were pre-mixed and then extruded and granulated with a twin-screw extruder. Extrude the produced particles with a single-screw extruder, and the extruded product is cast into a film, and then wound up after cooling to obtain a film with a thickness of 0.45 mm, which is designated as S1.

Embodiment 2

[0059] Si quantum dots with an average size of 10 nm and a standard deviation of 3 nm were surface treated with undecylenic acid surface treatment.

[0060] 50% Er 3+ Doped inorganic phosphor (the structural formula is expressed as NaY 0.5 Cl 4 :Er 3+ 0.5 ) is surface-coated with urethane resin.

[0061] In terms of parts by mass, 100 parts of EVA with VA content of 25wt%, 0.1 part of Si quantum dots through surface treatment, NaY coated on the surface 0.5 Cl 4 :Er 3+ 0.5 0.01 part, 0.5 part of 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 1 part of propoxylated glycerin triacrylate, γ-methacryloxypropyl trimethoxy 0.3 parts of silane and 0.2 parts of bis-2,2,6,6-tetramethylpiperidinol sebacate were pre-mixed and then extruded and granulated with a twin-screw extruder. Extrude the prepared particles with a single-screw extruder, cast the extruded product into a film, and wind it up after cooling to obtain a film with a thickness of 0.45 mm, which is designated as S2. ...

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Abstract

The invention discloses a solar cell packaging adhesive film with high light conversion efficiency. According to the adhesive film, a heavy rare earth ion doped inorganic fluorophor is adopted as a light up-conversion agent (two or more incident photons with the wavelength greater than 1,100 nm can be converted into a photo with the wavelength being 500 nm to 1,100 nm); a semiconductor quantum dot with a certain size distribution is adopted as a light down-conversion agent (an incident photon with the wavelength being 300 nm to 500 nm can be converted into a photo with the wavelength being 500 nm to 1,100 nm); the utilization rate of solar spectrum is effectively increased; and the photoelectric conversion efficiency of photovoltaic modules is improved. The conversion agents in the adhesive film do not contain organic ligands, so that the adhesive film is good in light stability and long in service life. In addition, the adhesive film is formed by premixing basic resin, the light down-conversion agent, the light up-conversion agent and the like and then performing extrusion casting or calendering by an extruder, so that the industrialized production can be realized.

Description

technical field [0001] The invention relates to an adhesive film composition used for solar cell packaging, in particular to an packaging adhesive film having both a light transfer function and a light up conversion function, and belongs to the field of new energy. Background technique [0002] Energy and environmental problems are becoming more and more severe, and it is urgent to seek a clean and sustainable new energy source. The solar photovoltaic power generation industry based on the photoelectric conversion effect is gradually entering the human energy structure. However, the theoretical maximum photoelectric conversion efficiency of widely used silicon-based solar cells is only 31% (Shockly-Queisser limit). In fact, the conversion efficiency of industrialized silicon-based solar cells is only about 17.5%, because the energy in the solar spectrum Photons smaller than the energy gap of silicon solar cells (Eg=1.1eV), that is, light with a wavelength greater than 1100n...

Claims

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Application Information

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IPC IPC(8): C09J7/00C09J123/08C09J11/04C09J11/06H01L31/048
CPCY02E10/50
Inventor 唐国栋熊曦侯宏兵周光大林建华
Owner HANGZHOU FIRST APPLIED MATERIAL CO LTD
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