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Current Status in Light Trapping Technique for Thin Film Silicon Solar Cells

박막태양전지의 광포획 기술 현황

  • Park, Hyeongsik (College of Information and Communication Engineering, Sungkyunkwan University) ;
  • Shin, Myunghoon (School of Electronics, Telecommunications and Computer Engineering, Korea Aerospace University) ;
  • Ahn, Shihyun (College of Information and Communication Engineering, Sungkyunkwan University) ;
  • Kim, Sunbo (Department of Energy Science, Sungkyunkwan University) ;
  • Bong, Sungjae (College of Information and Communication Engineering, Sungkyunkwan University) ;
  • Tuan, Anh Le (College of Information and Communication Engineering, Sungkyunkwan University) ;
  • Hussain, S.Q. (Department of Energy Science, Sungkyunkwan University) ;
  • Yi, Junsin (College of Information and Communication Engineering, Sungkyunkwan University)
  • 박형식 (성균관대학교 정보통신대학, 전기전자컴퓨터공학과) ;
  • 신명훈 (한국 항공대학교, 항공전자 및 정보통신공학부) ;
  • 안시현 (성균관대학교 정보통신대학, 전기전자컴퓨터공학과) ;
  • 김선보 (성균관대학교 에너지학과) ;
  • 봉성재 (성균관대학교 정보통신대학, 전기전자컴퓨터공학과) ;
  • ;
  • ;
  • 이준신 (성균관대학교 정보통신대학, 전기전자컴퓨터공학과)
  • Received : 2014.06.12
  • Accepted : 2014.06.12
  • Published : 2014.09.30

Abstract

Light trapping techniques can change the propagation direction of incident light and keep the light longer in the absorption layers of solar cells to enhance the power conversion efficiency. In thin film silicon (Si) solar cells, the thickness of absorption layer is generally not enough to absorb entire available photons because of short carrier life time, and light induced degradation effect, which can be compensated by the light trapping techniques. These techniques have been adopted as textured transparent conduction oxide (TCO) layers randomly or periodically textured, intermediate reflection layers of tandem and triple junction, and glass substrates etched by various patterning methods. We reviewed the light trapping techniques for thin film Si solar cells and mainly focused on the commercially available techniques applicable to textured TCO on patterned glass substrates. We described the characterization methods representing the light trapping effects, texturing of TCO and showed the results of multi-scale textured TCO on etched glass substrates. These methods can be used tandem and triple thin film Si solar cells to enhance photo-current and power conversion efficiency of long term stability.

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