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Design of a highly efficient light-trapping structure for amorphous silicon solar cell

Zhou Jun Sun Yong-Tang Sun Tie-Tun Liu Xiao Song Wei-Jie

Design of a highly efficient light-trapping structure for amorphous silicon solar cell

Zhou Jun, Sun Yong-Tang, Sun Tie-Tun, Liu Xiao, Song Wei-Jie
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  • Abstract views:  2019
  • PDF Downloads:  813
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Publishing process
  • Received Date:  12 August 2010
  • Accepted Date:  21 December 2010
  • Published Online:  05 April 2011

Design of a highly efficient light-trapping structure for amorphous silicon solar cell

  • 1. Institute of Optics and Photoelectronics, Ningbo University, Ningbo 315211, China;
  • 2. Department of Optical Engineering, Jiangsu University, Zhenjiang 212013, China;
  • 3. Changzhou Yijing Optical-Electronic Company Limited, Changzhou 213223, China;
  • 4. Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China

Abstract: A highly efficient light-trapping structure consisting of a diffractive grating, a MgF2 film, a ZnS film and Ag reflector, is used for a-Si:H solar cell. Using the rigorous coupled wave theory, the weighted absorptance photon number (AM1.5) of a 1 m thick a-Si:H solar cell is calculated in a wavelength range from 400 to 1000 nm for the AM1.5 solar spectrum at 25 ℃. It is used to design the optimal parameters of the light-trapping structure. Results indicate that AM1.5 of the solar cell can reach 74.3%, if the period, the depth and the duty cycle of the diffractive grating, and the height of the MgF2 film and the ZnS film are 800 nm, 160 nm, 0.6125, 90 nm and 55 nm, respectively. If a ZnS/Ag film is fabricated on the rear surface of the solar cell, a larger AM1.5 (76.95%) can be obtained. It is demonstrated that the trapping structure is useful for elevating the efficiency of the solar cell.

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