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Amorphous Silicon/Microcrystalline Silicon Tandem Solar Cell Based on Periodic Array of Nanoholes

A technology of solar cells and periodic arrays, applied in the field of solar photovoltaics, can solve problems such as difficult processes, complex structures, and increased manufacturing costs of microcrystalline silicon bottom cells and entire stacked solar cells, so as to reduce volume, enhance absorption efficiency, and weaken The effect of photodegradation effect

Inactive Publication Date: 2017-10-31
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, these structures are relatively complicated and the process is difficult
On the other hand, in most cases, especially when an intermediate reflective layer is added between the amorphous silicon top cell and the microcrystalline silicon bottom cell, the photocurrent enhancement of the top cell is higher than that of the bottom cell, and the current matching conditions are more demanding. Thick microcrystalline silicon bottom cell, but it will inevitably increase the preparation cost of microcrystalline silicon bottom cell and the whole stacked solar cell

Method used

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  • Amorphous Silicon/Microcrystalline Silicon Tandem Solar Cell Based on Periodic Array of Nanoholes
  • Amorphous Silicon/Microcrystalline Silicon Tandem Solar Cell Based on Periodic Array of Nanoholes
  • Amorphous Silicon/Microcrystalline Silicon Tandem Solar Cell Based on Periodic Array of Nanoholes

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Experimental program
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Effect test

Embodiment 1

[0030] The top transparent electrode 1 is set to be zinc oxide with a thickness of 80 nm; the thickness of the amorphous silicon top cell 2 is 260 nm; the thickness of the microcrystalline silicon bottom cell 3 is 2 μm; the low refractive index nanohole periodic array 4 is silicon dioxide, The diameter is 300 nm, the depth is 1.94 μm, and the period is 500 nm; the bottom transparent conductive oxide 5 is zinc oxide, and the thickness is 80 nm; the metal back reflection electrode 6 is silver, and the thickness is 200 nm.

[0031] Figure 4 Shown are the absorption lines (solid lines) of the amorphous silicon top cell and the microcrystalline silicon bottom cell of the above example, and the amorphous silicon top cell and microcrystalline silicon of the planar amorphous silicon / microcrystalline silicon tandem solar cell The absorption line (dashed line) of the bottom cell. From Figure 4 It can be seen that after introducing a periodic array of nanoholes into the planar amorph...

Embodiment 2

[0033]The top transparent electrode 1 is set to be tin oxide, and the thickness is on the order of submicron; the thickness of the amorphous silicon top cell 2 is less than or equal to 300 nm; the thickness of the microcrystalline silicon bottom cell 3 is less than or equal to 2 μm; the low refractive index nanohole periodic array 4 Al2O3, its diameter and period are on the order of submicron, and the depth does not exceed the bottom of the microcrystalline silicon; the bottom transparent conductive oxide 5 is tin oxide, and the thickness is on the order of submicron; the metal back reflection electrode 6 is silver, and the thickness is sufficient thick, no light can pass through.

[0034] By selecting different materials and setting different structural parameters, the sub-cell light absorption efficiency and photocurrent of the amorphous silicon / microcrystalline silicon stack solar cell based on the periodic array of nanoholes of the present invention can be flexibly regulate...

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Abstract

The invention discloses a nanoporous periodic array-based amorphous silicon / microcrystalline silicon stacked solar cell. A top transparent electrode evenly covers an amorphous silicon top cell; a microcrystalline silicon bottom cell is located at the lower part of the amorphous silicon top cell and the microcrystalline silicon bottom cell and the amorphous silicon top cell form a series structure; a bottom transparent conductive oxide is located between the microcrystalline silicon bottom cell and a metal back reflection electrode; and a low-refractive index nanoporous periodic array is started on the top transparent electrode and penetrates into the amorphous silicon top cell and the microcrystalline silicon bottom cell. Cell photocurrent matching and enhancement are achieved by optimizing the material and the structure size of the nanoporous periodic array and regulating and controlling the light absorption characteristics of sub-cells; the light absorption efficiency and the photocurrent can be further improved by selecting different top transparent electrodes and bottom transparent conductive oxides; the volume of the amorphous silicon top cell can be reduced by introducing the nanoporous periodic array; the inherent light-induced degeneration effect of the amorphous silicon material is greatly reduced; and the stability is high.

Description

technical field [0001] The invention relates to the field of solar photovoltaic technology, in particular to an amorphous silicon / microcrystalline silicon stacked solar cell based on a periodic array of nanoholes. Background technique [0002] Compared with monocrystalline silicon solar cells, stacked or even multi-layer solar cells can convert a wider band of solar photon energy into electrical energy by connecting two or more sub-cells in series, and the efficiency can be greatly improved. For thin-film silicon technology, amorphous silicon and microcrystalline silicon have band gaps of 1.7 eV and 1.1 eV, respectively, making them ideal for top and bottom cells in tandem solar cells. At present, the module efficiency of amorphous silicon / microcrystalline silicon-based tandem solar cells has reached 12.34% (Progress in Photovoltaics: Research and Applications 23(11): 1441-1447, 2015). As we all know, low short-circuit current is the most important factor limiting the photo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/0352
CPCH01L31/0352H01L31/035209
Inventor 杨柳戴浩何赛灵
Owner ZHEJIANG UNIV
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