DOI QR코드

DOI QR Code

Synthesis of Metal Oxide-Coated Conductive Metal Powders and Their Application to Front Electrodes for Solar Cells

산화물이 코팅된 전도성 금속 분말의 제조 및 태양전지 전면 전극으로의 응용

  • Park, Jin Gyeong (Materials Application Lab., LG Innotek Componet R&D Center) ;
  • Lee, Young-In (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
  • 박진경 (LG이노텍 부품소재연구소) ;
  • 이영인 (서울과학기술대학교 신소재공학과)
  • Received : 2014.08.14
  • Accepted : 2014.08.19
  • Published : 2014.09.27

Abstract

Recently, improvement in the conversion efficiency of silicon-based solar cells has been achieved by decreasing emitter doping concentration, because the lightly doped emitter can effectively prevent the recombination of electrons and holes generated by solar light irradiation. This type of emitter is very thin due to the low doping concentration, thus conductive materials (i.e., silver) used for front electrodes can easily penetrate the emitter during a firing process because of their large diffusivity in silicon. This results in junction leakage currents which might reduce cell efficiencies. In this study, $Al_2O_3$-coated Ag powders were synthesized by an ultrasonic spray pyrolysis method and applied to the conductive materials of the front electrode to control the junction leakage current. The $Al_2O_3$ shell obstructs the Ag diffusion into the emitter during the firing process. The powder is spherical with a core-shell structure and the thickness of the $Al_2O_3$ shell is tens of nanometers. Solar cells were fabricated using pure Ag powders or the $Al_2O_3$-coated Ag powder as front electrode materials, and the conversion efficiency and junction leakage current were compared to investigate the role of the $Al_2O_3$ shell during the firing processes.

Keywords

References

  1. N. S. Lewis, Science, 315, 798 (2007). https://doi.org/10.1126/science.1137014
  2. M. A. Green, K. Emery, Y. Hishikawa, W. Warta and E. D. Dunlop, Prog. Photovolt: Res. Appl., 20, 12 (2012). https://doi.org/10.1002/pip.2163
  3. P. Jackson, D. Hariskos, E. Lotter, S. Paetel, R. Wuerz, R. Menner, W. Wischmann and M. Powalla, Prog. Photovolt: Res. Appl., 19, 894 (2011). https://doi.org/10.1002/pip.1078
  4. P. Wang, S. M. Zakeeruddin, J. E. Moser, M. K. Nazeeruddin, T. Sekiguchi and Michael Gratzel, Nat. Mater., 2, 402 (2003). https://doi.org/10.1038/nmat904
  5. M. A. Green, Prog. Photovolt: Res. Appl., 17, 183 (2009). https://doi.org/10.1002/pip.892
  6. S. J. Eisele, T. C. Roder, J. R. Kohler and J. H. Werner, Appl. Phys. Lett., 95, 133501 (2009). https://doi.org/10.1063/1.3232208
  7. A. Cuevas and D. A. Russell, Prog. Photovolt: Res. Appl., 8, 603 (2000). https://doi.org/10.1002/1099-159X(200011/12)8:6<603::AID-PIP333>3.0.CO;2-M
  8. J. Benick, B. Hoex, M. Sanden, W. Kessels, O. Schultz1 and S. W. Glunzl, Appl Phys. Lett., 92, 253504 (2008). https://doi.org/10.1063/1.2945287