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Solar cell with surface combined grating structure

A solar cell and grating structure technology, which is applied in photovoltaic power generation, circuits, electrical components, etc., can solve the problems of low solar spectrum absorption rate, unsatisfactory absorption, and affecting the photoelectric conversion efficiency of cells, so as to strengthen spectral absorption and improve photoelectricity. The effect of conversion efficiency

Active Publication Date: 2013-04-24
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] It can be seen that compared with ordinary solar cells, solar cells with microstructured surfaces have improved spectral absorption and efficiency, but there are still some problems: the periodic microstructured surface of general arrays has a negative effect on certain parts of the battery. band, its solar spectrum absorption rate is not high, resulting in unsatisfactory absorption in the entire working band, which directly affects the photoelectric conversion efficiency of the battery

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  • Solar cell with surface combined grating structure
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Embodiment 1

[0013] The grating structure period of the solar cell with the surface combined grating structure of the present invention Λ=300nm, the filling ratio is 0.8, that is, the grating width w 1 =w 2 =w 3 = 80nm, grating depth ratio is h 1 :h 2 :h 3 =1:2:3, the values ​​are 50nm, 100nm, 150nm in turn. combine figure 1 The absorption rate is higher than 85% in the whole working band of the silicon cell, the average absorption rate exceeds 95%, and the photoelectric conversion efficiency of the cell reaches 27.59%.

Embodiment 2

[0015] The grating structure period of the solar cell with the surface combined grating structure of the present invention Λ=500nm, the filling ratio is 0.8, that is, the grating width w 1 =w 2 =w 3 =w 4 =w 5 = 80nm, grating depth ratio is h 1 :h 2 :h 3 : h 4 :h 5 =1:2:3:2:1, when the values ​​are 50nm, 100nm, 150nm, 100nm, and 50nm in turn, the absorptivity calculated by the finite difference time domain method is higher than 75% in the entire silicon cell working band, and the average absorptivity exceeds 89%, and the photoelectric conversion efficiency of the battery reaches 26.83%.

Embodiment 3

[0017] The grating structure period of the solar cell with the surface combined grating structure of the present invention Λ=1500nm, the filling ratio is 0.9, that is, the grating width w 1 =w 2 =w 3 = 450nm, grating depth ratio is h 1 : h 2 : h 3 =1:3:2, when the values ​​are 250nm, 750nm, and 500nm in turn, the average absorption rate calculated by the finite difference time domain method exceeds 69%, and the photoelectric conversion efficiency of the cell is 25.53%.

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Abstract

The invention discloses a solar cell with a surface combined grating structure. The solar cell comprises a back electrode and a silicon chip substrate, wherein the back electrode is arranged on the lower surface of the silicon chip substrate and is in ohmic contact with the surface of the silicon chip substrate; and the upper surface of the silicon chip substrate forms a combined grating which comprises gratings with different depths in a structural period. An orderly arranged combined one-dimensional grating structure is formed on the substrate of a bulk silicon material, a plurality of gratings with the same width and different depths are contained in a grating period, and the solar cell is simple and feasible; and the spectral absorption of the surface of the silicon solar cell is improved, and the photoelectric conversion efficiency of the solar cell is improved.

Description

technical field [0001] The invention belongs to a surface microstructure solar battery, in particular to a solar battery with a surface combined grating structure. Background technique [0002] Solar cells are devices that directly convert sunlight energy into electrical energy. Generally speaking, solar cells are noiseless, odorless, and non-polluting to the environment. They do not undergo chemical changes or mechanical wear during the power generation process, and are widely used in scientific research and daily life. At present, improving the photoelectric conversion efficiency of the battery and reducing the production cost of the battery are the most critical issues. Harvesting as much solar radiation energy as possible is the main way to improve efficiency. Due to unique optical and electrical properties, solar cell surface microstructures have attracted much attention for enhancing energy harvesting. [0003] Researchers from various countries are constantly study...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/042H01L31/0232H01L31/0236H01L31/054
CPCY02E10/50
Inventor 宣益民李强韩玉阁杨理理谭俊杰
Owner NANJING UNIV OF SCI & TECH