Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Photovoltaic Performance of Crystalline Silicon Recovered from Solar Cell Using Various Chemical Concentrations in a Multi-Stage Process

습식 화학 공정에 의한 태양전지로부터 고순도 실리콘 회수 및 이를 이용한 태양전지 재제조

  • Noh, Min-Ho (Separation and Conversion Materials Laboratory, Korea Institute of Energy Research) ;
  • Lee, Jun-Kyu (Separation and Conversion Materials Laboratory, Korea Institute of Energy Research) ;
  • Ahn, Young-Soo (Separation and Conversion Materials Laboratory, Korea Institute of Energy Research) ;
  • Yeo, Jeong-Gu (Separation and Conversion Materials Laboratory, Korea Institute of Energy Research) ;
  • Lee, Jin-Seok (Separation and Conversion Materials Laboratory, Korea Institute of Energy Research) ;
  • Kang, Gi-Hwan (Photovoltaic Laboratory, Korea Institute of Energy Research) ;
  • Cho, Churl-Hee (Graduate School of Energy Science and Technology, Chungnam National University)
  • 노민호 (한국에너지기술연구원 분리변환소재연구실) ;
  • 이준규 (한국에너지기술연구원 분리변환소재연구실) ;
  • 안영수 (한국에너지기술연구원 분리변환소재연구실) ;
  • 여정구 (한국에너지기술연구원 분리변환소재연구실) ;
  • 이진석 (한국에너지기술연구원 분리변환소재연구실) ;
  • 강기환 (한국에너지기술연구원 태양광연구실) ;
  • 조철희 (충남대학교 에너지과학기술대학원)
  • Received : 2019.09.17
  • Accepted : 2019.10.15
  • Published : 2019.11.27
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Abstract

In this study, using a wet chemical process, we evaluate the effectiveness of different solution concentrations in removing layers from a solar cell, which is necessary for recovery of high-purity silicon. A 4-step wet etching process is applied to a 6-inch back surface field(BSF) solar cell. The metal electrode is removed in the first and second steps of the process, and the anti-reflection coating(ARC) is removed in the third step. In the fourth step, high purity silicon is recovered by simultaneously removing the emitter and the BSF layer from the solar cell. It is confirmed by inductively coupled plasma mass spectroscopy(ICP-MS) and secondary ion mass spectroscopy(SIMS) analyses that the effectiveness of layer removal increases with increasing chemical concentrations. The purity of silicon recovered through the process, using the optimal concentration for each process, is analyzed using inductively coupled plasma atomic emission spectroscopy(ICP-AES). In addition, the silicon wafer is recovered through optimum etching conditions for silicon recovery, and the solar cell is remanufactured using this recovered silicon wafer. The efficiency of the remanufactured solar cell is very similar to that of a commercial wafer-based solar cell, and sufficient for use in the PV industry.

Keywords

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