Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
권호 표지
DOI QR코드

DOI QR Code

Effects of Firing Ambient on Rear Metallization for Silicon Solar Cells

분위기에 따른 실리콘 태양전지 후면 전극 및 후면 전계의 형상과 특성 분석

  • Park, Sungeun (Department of Materials Science and Engineering, Korea University) ;
  • Kim, Young Do (Department of Materials Science and Engineering, Korea University) ;
  • Park, Hyomin (Department of Materials Science and Engineering, Korea University) ;
  • Kang, Yoonmook (KU.KIST Green School, Graduated school of Energy and Environment, Korea University) ;
  • Lee, Hae-Seok (Department of Materials Science and Engineering, Korea University) ;
  • Kim, Donghwan (Department of Materials Science and Engineering, Korea University)
  • 박성은 (고려대학교 신소재공학과) ;
  • 김영도 (고려대학교 신소재공학과) ;
  • 박효민 (고려대학교 신소재공학과) ;
  • 강윤묵 (고려대학교 그린스쿨대학원 에너지환경정책기술학과) ;
  • 이해석 (고려대학교 신소재공학과) ;
  • 김동환 (고려대학교 신소재공학과)
  • Received : 2015.04.27
  • Accepted : 2015.06.30
  • Published : 2015.07.27
Download PDF
⟨ Previous Next ⟩

Abstract

For rear metallization with Al paste, Al back contacts require good passivation, high reflectance, and a processing temperature window compatible with the front metal. In this paper, the effect of the firing ambient during the metallization process on the formation of Al rear metal was investigated. We chose three different gases as ambient gases during the firing process. Using SEM, we observed the formation of a back surface field in $N_2$, $O_2$, and Air ambients. To determine the effect of the ambient on Voc, the suns-Voc tool was used. In this study, we described the mechanism of burn-out of organic materials in Al paste during the firing process. The oxygen ambient plays an important role in the burn-out process. We calculated the efficiency with obtained the back surface recombination velocities using PC1D simulation. It was found that the presence of oxygen during the firing process influenced the uniform back surface field because the organic materials in the Al paste were efficiently burned out during heating. The optimized temperature with oxygen flow shows an absolute efficiency of 19.1% at PC1D simulation.

Keywords

References

  1. K. Kim, S. K. Dhungel, U. Gangopadhyay, J. Yoo, W. S. Choi and J. Yi, Thin Solid Films, 511-512, 228 (2006). https://doi.org/10.1016/j.tsf.2005.12.131
  2. S. Noel, H. Lautenschlager, C. Muller, Highest efficiency rapid thermal processed multicrystalline silicon solar cells. https://doi.org/10.1002/pip.353
  3. J. W. Jeong, A. Rohatgi, V. Yelundur, A. Ebong, M. D. Rosenblum and J. P. Kalejs, IEEE transactions on electron devices, 48(12), 2836 (2001). https://doi.org/10.1109/16.974713
  4. S. Narasimha, A. Rohatgi and A. W. Weeber, IEEE transactions on electron devices, 46(7), 1363 (1999). https://doi.org/10.1109/16.772477
  5. S. Park, J. Song, S. J. Tark, Y. D. Kim, C. Choi, S. Kwon, S. Yoon, C. S. Son and D. Kim, Prog. photovoltaics, 22(8), 863 (2014). https://doi.org/10.1002/pip.2322
  6. S. Park, Y. D. Kim, S. Bae, S. Kim, J. Song, H. Kim, H. M. Park, S. Kim, S. J. Tark and D. Kim, Met. Mater. Int., 18(4), 731 (2012). https://doi.org/10.1007/s12540-012-4022-y
  7. S. Narasimha, A. Rohatgi and A. W. Weeber, IEEE trans. Electron Devices, 46, 1363 (1999). https://doi.org/10.1109/16.772477
  8. C. Schmiga, H. Nagel and J. Schmidt, Prog. photovoltaics 14, 533 (2006). https://doi.org/10.1002/pip.725
  9. R. Bock, J. Schmidt, S. Mau, B. Hoex, E. Kessels and R. Brendel, Proc. 34th IEEE Photovoltaic Specialists Conference, p. 30, Philadelphia, USA (2009).
  10. M. Rauer, C. Schmiga, M. Hermle and S. W. Glunz, Proc. 24th European Photovoltaic Solar Conference and Exhibition, p. 21, Hamburg, Germany (2009).