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Analysis of the Current-voltage Curves of a Cu(In,Ga)Se2 Thin-film Solar Cell Measured at Different Irradiation Conditions

  • Lee, Kyu-Seok (Thin Film Photovoltaic Technology Research Team, Electronics and Telecommunications Research Institute) ;
  • Chung, Yong-Duck (Thin Film Photovoltaic Technology Research Team, Electronics and Telecommunications Research Institute) ;
  • Park, Nae-Man (Thin Film Photovoltaic Technology Research Team, Electronics and Telecommunications Research Institute) ;
  • Cho, Dae-Hyung (Thin Film Photovoltaic Technology Research Team, Electronics and Telecommunications Research Institute) ;
  • Kim, Kyung-Hyun (Thin Film Photovoltaic Technology Research Team, Electronics and Telecommunications Research Institute) ;
  • Kim, Je-Ha (Thin Film Photovoltaic Technology Research Team, Electronics and Telecommunications Research Institute) ;
  • Kim, Seong-Jun (Nano Electronics Engineering Part, University of Science and Technology) ;
  • Kim, Yeong-Ho (Nano Electronics Engineering Part, University of Science and Technology) ;
  • Noh, Sam-Kyu (Nano Electronics Engineering Part, University of Science and Technology)
  • Received : 2010.10.13
  • Accepted : 2010.11.19
  • Published : 2010.12.25

Abstract

We analyze the current density - voltage (J - V) curve of a Cu(In,Ga)$Se_2$ (CIGS) thin-film solar cell measured at different irradiation power densities. For the solar-cell sample investigated in this study, the fill factor and power conversion efficiency decreased as the irradiation power density (IPD) increased in the range of 2 to 5 sun. Characteristic parameters of solar cell including the series resistance ($r_s$), the shunt resistance ($r_{sh}$), the photocurrent density ($J_L$), the saturation current density ($J_s$) of an ideal diode, and the coefficient ($C_s$) of the diode current due to electron-hole recombination via ionized traps at the p-n interface are determined from a theoretical fit to the experimental data of the J - V curve using a two-diode model. As IPD increased, both $r_s$ and $r_{sh}$ decreased, but $C_s$ increased.

Keywords

References

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