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Multi-scale light trapping structure for thin-film solar cells

A technology of solar cells and light trapping structure, applied in circuits, photovoltaic power generation, electrical components, etc., can solve the problems of angle sensitivity and limited spectrum, and achieve the effect of improving conversion efficiency, wide spectrum absorption, and avoiding Auger recombination.

Inactive Publication Date: 2015-04-15
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this scheme leads to strong absorption enhancement through the coupling mechanism, the periodic structure suffers from spectral limitation and angle sensitivity.

Method used

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  • Multi-scale light trapping structure for thin-film solar cells
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  • Multi-scale light trapping structure for thin-film solar cells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Set n=3, the initialization period is 1100nm, according to the formula needs to be optimized (a 1 ,b 1 ,a 2 ,b 2 ,a 3 ,b 3 ,), according to the specific construction steps above, the optimized parameters obtained after two hundred iterations are shown in the following table:

[0034] A 1 A 2 A 3 B 1 B 2 B 3 n Λ 0.8 1.22 0.7 1.62 0.6 1.5 3 1100nm

[0035] At this point the surface formula is:

[0036] F ( x ) = Σ ( 0.8 * sin ( 2 π * n 1100 x ...

Embodiment 2

[0039] Set n=4, the initialization period is 1300nm, according to the formula

[0040] Therefore, it is necessary to optimize (a 1 ,b 1 ,a 2 ,b 2 ,a 3 ,b 3 ,a 4 ,b 4 ,) According to the specific construction steps above, the optimized parameters obtained after two hundred iterations are shown in the following table:

[0041] A 1 A 2 A 3 A 4 B 1 B 2 B 3 B 4 n Λ 0.9 1.1 0.98 1.05 0.9 1.1 0.9 1.02 4 1300nm

[0042] At this point the surface formula is:

[0043] F ( x ) = Σ ( 0 . 9 * sin ( 2 π * ...

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Abstract

The invention discloses a multi-scale nano light trapping structure for improving absorption efficiency of solar cells. The surface contour of the structure is composed of multiple ordered structures in combination, the light trapping structure is integrated over a solar cell absorption material to trap light, and the defect that the existing light trapping structure is low in absorptivity can be overcome. The multi-scale light trapping structure has the capability of promoting the absorption efficiency to the theoretic limit, so that cell conversion efficiency is improved greatly.

Description

technical field [0001] The invention relates to the fields of new clean energy and micro-nano photonics, in particular to a multi-scale light-trapping structure for improving the absorption efficiency of solar cells. Background technique [0002] Silicon is currently the most widely used material for solar cells. Silicon is abundant in nature and has no toxicity to the human body. But the cost of silicon solar cells is high at present, the reason is that the silicon layer is too thick. To compete with fossil fuels, the silicon layer thickness must be reduced. However, as the thickness decreases, the absorption length also decreases accordingly, which leads to a worldwide problem for thin-film silicon solar cells, and the conversion efficiency is not high. For example, for a 2-micron thin silicon solar cell, its conversion efficiency can be close to 20% in theory, but currently the maximum conversion efficiency is about 10%, so it is necessary to use a light trapping struc...

Claims

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Application Information

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IPC IPC(8): H01L31/0232H01L31/0352
CPCY02E10/50H01L31/02167H01L31/0352
Inventor 郭小伟夏玮张手强刘志军
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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