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Solar cell with gradient buffer layer

A technology of solar cells and graded buffer layers, applied in the field of solar cells, can solve the problems of reducing the epitaxial quality of InGaAs cells, lattice dislocation, etc.

Active Publication Date: 2013-07-31
EPISTAR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lattice dislocation will still occur in InGaAs cells with a lower energy gap, which will reduce the epitaxial quality of InGaAs cells

Method used

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  • Solar cell with gradient buffer layer
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Embodiment Construction

[0021] Embodiments of the present invention will be described in detail and shown in the drawings, and the same or similar parts will appear with the same reference numerals in the drawings and descriptions.

[0022] Such as figure 1 As shown, an inverse metamorphic multi-junction (IMM) solar cell 1 includes a support substrate 10; a bottom cell 12 is positioned on the support substrate 10; a graded buffer layer 14 is positioned on the bottom cell 12; an intermediate cell 16 is positioned on the bottom cell 12. on the graded buffer layer 14; and a top cell 18 on the middle cell 16. The energy gap of the top cell 18 is larger than that of the middle cell 16 and the bottom cell 12 , and its material includes InGaP, InGaAs, AlGaAs or AlGaInP. The energy gap of the middle cell 16 is larger than that of the bottom cell 12, and its material includes GaAs, GaInP, InGaAs, GaAsSb or InGaAsN. The material of the bottom cell 12 includes Ge, GaAs or InGaAs. The top cell 18 , the middle...

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PUM

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Abstract

The invention discloses an IMM (inverted metamorphic multijunction) solar cell. The solar cell comprises a support substrate, a bottom cell on the support substrate, a gradient buffer layer on the bottom cell, a middle cell on the gradient buffer layer and a top cell on the middle cell.

Description

technical field [0001] The present invention relates to a photoelectric element, in particular to a solar cell with a graded buffer layer. Background technique [0002] Photoelectric elements include many types, such as light-emitting diodes (Light-emitting Diodes; LEDs), solar cells (Solar Cells) or photodiodes (Photo Diodes) and the like. [0003] Due to the shortage of petrochemical energy and the increasing awareness of the importance of environmental protection, people have been actively researching and developing technologies related to alternative energy and renewable energy in recent years, among which solar cells have attracted the most attention. The main reason is that solar cells can directly convert solar energy into electrical energy, and no harmful substances such as carbon dioxide or nitride will be produced during the power generation process, and will not pollute the environment. Among solar cells, InGaP / GaAs / Ge three-junction solar cells have the most pot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/042H01L31/0352H01L31/0304H01L31/0687
CPCY02E10/52H01L31/06875Y02E10/544
Inventor 李荣仁林宣乐李世昌
Owner EPISTAR CORP