Solar cell module with high conversion efficiency

A solar cell and high-conversion technology, which is applied in the field of solar materials and devices, can solve the problems of reducing the output power and conversion efficiency of modules, increasing the temperature of cells, and reducing the conversion efficiency of modules, so as to improve output power and conversion efficiency, increase photogenerated current, to achieve the effect of effective use

Inactive Publication Date: 2016-04-13
WORLDWIDE ENERGY & MFG NANTONG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the relationship between the materials used, the utilization rate of short-wavelength light in solar cell components is very low. For example, the ultraviolet cut-off wavelength of existing packaging materials is generally 360nm. The packaging material absorbs and cannot be used by solar cells, thus indirectly reducing the output power and conversion efficiency of the module
In addition, for infrared light with a wavelength greater than 1200nm, since the photon energy is smaller than the bandgap width of silicon, it cannot cause the cell to generate photoelectric current, and this part of the light can only be converted into heat, thereby increasing the temperature of the cell and reducing the conversion efficiency of the module.

Method used

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  • Solar cell module with high conversion efficiency

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Embodiment 1

[0020] In this embodiment, both the upper and lower packaging layers are made of ethylene-vinyl acetate copolymer, and the UV cut-off wavelength of the upper packaging layer is 300nm, so it can transmit light with a wavelength greater than 300nm, so for 300nm The ultraviolet light in the ~400nm band can be completely absorbed and utilized by solar cells, which increases the photogenerated current and improves the output power of the module.

[0021] In addition, both the upper and lower encapsulation layers are doped with fluoride NaYF 4 :Yb 3+ ,Er 3+ , with a doping concentration of 2%, uniformly dispersed in the upper encapsulation layer and the lower encapsulation layer. This material is an up-conversion material that converts infrared light into green light. During conversion, Yb 3+ ( 2 f 7 / 2 → 2 f 5 / 2 ) absorbs near-infrared radiation and passes it to Er 3+ , so Er 3+ of 4 I 11 / 2 Particles on energy levels are accumulated. exist 4 I 11 / 2 During the lifetime...

Embodiment 2

[0023] In this embodiment, the material of the upper packaging layer and the lower packaging layer is polyvinyl butyral, and the ultraviolet cut-off wavelength of the upper packaging layer is 308nm, so for the ultraviolet light in the 308nm-400nm band, the solar cells can completely absorb Utilization increases the photogenerated current and improves the output power of the module.

[0024] In addition, both the upper and lower packaging layers are doped with fluoride YF 3 :Yb 3+ ,Tm 3+ , with a doping concentration of 5%, uniformly dispersed in the upper encapsulation layer and the lower encapsulation layer. This material is an up-conversion material, which can convert infrared light into blue light through a three-photon up-conversion process. During conversion, Yb 3+ ( 2 f 7 / 2 → 2 f 5 / 2 ) absorbs near-infrared radiation and transfers it to Tm 3+ . After the first pass, Tm 3+ of 3 h 5 The number of particles at the energy level is accumulated and then rapidly de...

Embodiment 3

[0026] In this embodiment, the materials of the upper encapsulation layer and the lower encapsulation layer are both silicone, and the ultraviolet cut-off wavelength of the upper encapsulation layer is 305nm, so for the ultraviolet light in the 305nm-400nm band, the solar cells can completely absorb and utilize it, increasing the The photogenerated current increases the output power of the module.

[0027] In addition, both the upper and lower encapsulation layers are doped with fluoride NaYF 4 :Er 3+ , with a doping concentration of 7%, uniformly dispersed in the upper packaging layer and the lower packaging layer, through the up-conversion process, the infrared light can be converted into green light. During the conversion process, by successively absorbing two photons, Er 3+ jump to 4 S 3 / 2 energy level, last 4 S 3 / 2 The energy level produces green emission.

[0028] It can be seen that the present invention can realize the effective utilization of light in various b...

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Abstract

The invention relates to a solar cell module with high conversion efficiency. The solar cell module comprises ultra-clear low-irontempered glass, an upper package layer, a solar cell, a lower package layer and a back plate, which are sequentially stacked from top to bottom and are laminated into a whole at a high temperature, wherein the upper package layer and the lower package layer are made of one of an ethylene-vinyl acetate copolymer, polyvinyl butyral, silicone or polyurethane; the upper package layer and the lower package layer are evenly doped with a spectral conversion material; and the ultraviolet cut-off wavelengths of the upper package layer and the lower package layer are smaller than 310nm. The used package layers achieve effective utilization of ultraviolet light in a solar spectrum; an infrared light which cannot be absorbed by a silicon solar cell is converted into a visible light with a relatively high response to the solar cell through the spectral conversion material; the photo-generated current is increased; and the temperature of the cell is indirectly lowered, so that the output power and the conversion efficiency of the module are improved.

Description

technical field [0001] The invention relates to the field of solar materials and devices, in particular to a solar cell assembly with high conversion efficiency. Background technique [0002] As a clean and green renewable energy source, solar energy has received more and more attention, and its application is becoming more and more extensive. In addition to the traditional light-to-heat conversion, one of the most important applications of solar energy is photovoltaic power generation. The most basic unit of photovoltaic power generation is a solar cell. In a specific application, a solar cell module is usually composed of a plurality of interconnected solar cells, and then each solar cell module is connected to form an overall current output. [0003] Currently widely used solar cell modules are basically composed of ultra-white low-iron tempered glass, two layers of EVA (ethylene-vinyl acetate copolymer), solar cells and back sheets and other materials. Since the output ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/055H01L31/048
CPCY02E10/52H01L31/055H01L31/0481
Inventor 王建军宁兆伟冯涛梁丛武张健超黄涛华
Owner WORLDWIDE ENERGY & MFG NANTONG
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