Ultrathin crystalline silicon solar cells by textured triangular grating

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• 作者：Xiaodong Lu ; Peng Zhang ; Yang Zhao ; Zelai Wang…
• 关键词：Solar cell ; Crystalline silicon ; Grating
• 刊名：Optical and Quantum Electronics
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：48
• 期：1
• 全文大小：2,819 KB
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• 作者单位：Xiaodong Lu (1)
  Peng Zhang (1)
  Yang Zhao (1)
  Zelai Wang (1)
  Yuanqing Wu (1)
  Tao Zhou (1)
  Hang lv (1)
  
  1. College of New Energy, Bohai University, Jinzhou, 121000, Liaoning, China
  
• 刊物主题：Optics, Optoelectronics, Plasmonics and Optical Devices; Electrical Engineering; Characterization and Evaluation of Materials; Computer Communication Networks;
• 出版者：Springer US
• ISSN：1572-817X

文摘

Grating structures can effectively enhance the light absorption abilities of solar cells with ultrathin active layer. In this work, a light trapping scheme composed of front surface triangular grating structure, bilayer antireflection coating and Ag back reflector is first designed for a ultrathin c-Si solar cell with a active layer thickness of 12 渭m. The geometrical parameters of grating structure are then optimized by a dimensionless absorption enhancement factor. Finally, four methods are adopted to comprehensively evaluate the performances of the optimal grating structure, i.e. the front surface reflectance of external and internal light with different incident angles, intensity distribution of internal diffraction light and photocurrent density. The results show that the reflectance of external light with the incident angle smaller than 45掳 can be decreased to a level less than 5 %; light absorbed incompletely in a single pass through the active layer can obtain a diffraction angle larger than 38掳 for TE mode and 50掳 for TM mode in the c-Si active layer; internal nonzero-order diffraction light reflected by Ag back reflector can achieve a reflectance larger than 80 % at the front surface; the cell photocurrent density can reach 35.12 mA/cm2. Keywords Solar cell Crystalline silicon Grating