Enhancement of Light Absorption in Thin Film Silicon Solar Cells with Light Traping

SHEN Hong-jun; LI Ting; LU Hui-dong; HUANG Xian-jian; LI Xin-lan

doi:10.3788/fgxb20163707.0816

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Enhancement of Light Absorption in Thin Film Silicon Solar Cells with Light Traping

更新时间：2020-08-12

- Enhancement of Light Absorption in Thin Film Silicon Solar Cells with Light Traping
- Chinese Journal of Luminescence Vol. 37, Issue 7, Pages: 816-822(2016)
- 作者机构：
  
  1. 宁夏大学物理电气信息学院,宁夏银川,750021
  2. 青海大学新能源光伏产业研究中心,青海西宁,810016
- 作者简介：
- 基金信息：
- DOI：10.3788/fgxb20163707.0816
  CLC： O436
- Received：29 February 2016，
  
  Revised：01 April 2016，
  
  Published：05 July 2016
- 稿件说明：
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沈宏君, 李婷, 卢辉东等. 利用陷光结构增加硅薄膜太阳能电池的吸收效率[J]. 发光学报, 2016,37(7): 816-822

SHEN Hong-jun, LI Ting, LU Hui-dong etc. Enhancement of Light Absorption in Thin Film Silicon Solar Cells with Light Traping[J]. Chinese Journal of Luminescence, 2016,37(7): 816-822
沈宏君, 李婷, 卢辉东等. 利用陷光结构增加硅薄膜太阳能电池的吸收效率[J]. 发光学报, 2016,37(7): 816-822 DOI： 10.3788/fgxb20163707.0816.

SHEN Hong-jun, LI Ting, LU Hui-dong etc. Enhancement of Light Absorption in Thin Film Silicon Solar Cells with Light Traping[J]. Chinese Journal of Luminescence, 2016,37(7): 816-822 DOI： 10.3788/fgxb20163707.0816.

摘要

提出了一种含有光锥光子晶体防反射层和四棱锥光栅背反射层的a-Si薄膜太阳能电池结构

吸收层厚1 m

总厚度为1.45 m。根据光子晶体及亚波长光栅的衍射特性

利用严格耦合波方法对器件参数进行了优化。计算结果表明:当光锥结构倾角

=72、晶格常数

=1200 nm、介质底半径

=100 nm时

防反射层的透射率较高

在300~600 nm波长范围内

该薄膜太阳能电池的吸收效率比不含防反射层电池提高了11.54%;当四棱锥光栅结构周期

=1.2 m、占空比

=0.38、槽深

=560 nm时

背反射层的反射效果较好

在600~850 nm波长范围内

电池的吸收效率提高了3.75%。所设计的薄膜电池结构在波长为300~750 nm、入射角为0~75范围内的吸收效率均在80%以上

平均吸收效率达92%

满足太阳电池对宽频谱、广角度的光俘获的要求。

Abstract

An amorphous silicon thin-film solar cell with an anti-reflection coating of light cone photonic crystal and a back surface field layer of rectangular pyramid grating is proposed. The thickness of the cell is 1.45m and the thickness of the absorbing layer is 1m. Using Rigorous Coupled Wave Analysis method

the parameters of the cell are optimized based the diffraction characteristics of the photonic crystal and the sub-wavelength grating. When the light cone angle is 72

the lattice constant is 1200 nm

and the bottom radius is 100 nm

a relative increase of 11.54% for the integrated absorption inside the solar cell can be achieved between 300 nm and 600 nm

compared to an equivalent but no anti-reflection coating cell. When the rectangular pyramid grating period is 1.2m

the duty cycle is 0.38

and the depth of the grating is 560 nm

a relative increase of 3.75% for the integrated absorption inside the solar cell can be achieved between 600 nm and 850 nm. According to the simulation

the absorption of the designed thin-film solar cell is over than 80% in the incident angle range of 0-75 and the wavelength between 300 nm and 750 nm

and the average absorption is up to 92%. This solar cell is designed to meet the demanding requirements of a wide spectrum and wide-angle light capture.

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