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Silicon double junction stack solar cell

A solar cell and silicon-based technology, applied in the field of solar cells, can solve problems such as waste and achieve the effect of improving photoelectric conversion efficiency

Pending Publication Date: 2017-09-22
GUANGDONG AIKO SOLAR ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the band gap, crystalline silicon solar cells can only absorb sunlight with a wavelength of less than 1.1 μm, and most of the long-wavelength light will be wasted

Method used

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  • Silicon double junction stack solar cell

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Embodiment Construction

[0027] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below through the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0028] Unless otherwise defined, all technical terms and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present invention, and the terms used in the description of the present invention herein are only to describe specific implementations The purpose of the example is not intended to limit the present invention.

[0029] Such as figure 1 , Figure 4 As shown, a silicon-based double-junction tandem solar cell includes a monocrystalline silicon P-type cell, a bonding layer 8 and a Ge sub-cell, and t...

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Abstract

The invention discloses a silicon double junction stack solar cell, belonging to the technical field of solar cells. The silicon double junction stack solar cell comprises a monocrystalline P type cell, a bonding layer, and a Ge secondary cell. The Ge secondary cell is bonded on the back of the monocrystalline P type cell through the bonding layer. A Ge substrate is used as a support base. The Ge secondary cell matched with a Ge lattice is grown through MOCVD or MBE and is bonded onto the back of the monocrystalline P type cell, so as to obtain the silicon double junction stack solar cell. The Ge secondary cell is bonded onto the back of the monocrystalline P type cell, a Si secondary cell absorbs light with a wavelength of less than 1100nm, and the Ge secondary cell absorbs light with a wavelength of less than 1850nm, so that the two cells cooperate to fully utilize solar spectrum. The monocrystalline P type cell and the Ge secondary cell are connected with each other serially through a tunnel junction, the secondary cells are bonded together through a lattice bonding layer, so as to prepare the silicon double junction stack solar cell.

Description

technical field [0001] The invention relates to a solar cell, in particular to a silicon double-junction stacked solar cell, which belongs to the technical field of solar cells. Background technique [0002] Due to the low cost and mature manufacturing process, crystalline silicon solar cells will still be the mainstream products of solar cells in the next ten or twenty years. Due to the band gap, crystalline silicon solar cells can only absorb sunlight with a wavelength of less than 1.1 μm, and most of the long-wavelength light will be wasted. [0003] The conversion efficiency of crystalline silicon solar cells is still low. To improve the photoelectric conversion efficiency of crystalline silicon solar cells, it is necessary to try to improve the light absorption of the cells. The traditional cell technology is mainly based on reducing the recombination of minority carriers in the cell and the cell interface. The photoelectric conversion efficiency of the battery is impr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0352H01L31/06
CPCH01L31/03529H01L31/06Y02E10/50
Inventor 吴波秦崇德周文远方结彬
Owner GUANGDONG AIKO SOLAR ENERGY TECH CO LTD