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
  • Description
  • Claims
  • Application Information

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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 b

Method used

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  • Solar cell packaging adhesive film with high light conversion efficiency

Examples

Experimental program
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Example Embodiment

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

[0022] The size of the semiconductor quantum dots must be in the quantum confinement state, that is, less than 10 nm. The standard deviation of the size distribution of the quantum dots is less than 30% and greater than 10% of the mean size based on the maximum utilization of the spectrum in the 300-500 nm interval, ie the broadest absorption band. The standard deviation is too small, indicating 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, resulting in a decrease in the absorption coefficient of each specific wavelength. The emission spectrum of the semiconductor quantum dots in the range of 500-1100 nm can be adjusted by the type and size of the quantum dots.

[0023] In order to make the semiconductor quantu...

Example Embodiment

[0054] Example 1:

[0055] The 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 phosphors (structural formula expressed as NaY 0.8 F 4 : Er 3+ 0.2 ) with polymethyl methacrylate for surface coating.

[0057] In parts by mass, 100 parts of EVA with a VA content of 30 wt%, 2 parts of surface-treated Si quantum dots, and 2 parts of surface-coated NaY 0.8 F 4 : Er 3+ 0.2 1 part, 1 part of tert-butyl peroxyoctanoic 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 part is extruded and pelletized with a twin-screw extruder after pre-mixing. The formed particles are extruded with a single-screw extruder, the extrudate is casted to form a film, and after cooling, the film is wound to obtain a film with a thickness of 0.45 mm, denoted as S1.

Example Embodiment

[0058] Example 2:

[0059] The 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 phosphors (structural formula expressed as NaY 0.5 Cl 4 : Er 3+ 0.5 ) with urethane resin for surface coating.

[0061] In parts by mass, 100 parts of EVA with a VA content of 25 wt%, 0.1 part of surface-treated Si quantum dots, and 0.1 part of surface-coated NaY 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 glycerol triacrylate, γ-methacryloyloxypropyltrimethoxy 0.3 part of silane and 0.2 part of bis-2,2,6,6-tetramethylpiperidinol sebacate are premixed and then extruded and pelletized by a twin-screw extruder. The formed particles are extruded with a single-screw extruder, and the extrudate is casted to form a film. After cooling, the film is wound up to obtain a film with a thickness of 0.45 mm, ...

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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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