Current Photovoltaic Research

Korea Photovoltaic Society (한국태양광발전학회)
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Effects of Se/(S+Se) Ratio on Cu2ZnSn(SxSe1-x)4 (CZTSSe) Thin Film Solar Cells Fabricated by Sputtering

  • Park, Ju Young (Department of Materials Science and Engineering and Optoelectronics Convergence Research Centre, Chonnam National University) ;
  • Hong, Chang Woo (Department of Materials Science and Engineering and Optoelectronics Convergence Research Centre, Chonnam National University) ;
  • Moon, Jong Ha (Department of Materials Science and Engineering and Optoelectronics Convergence Research Centre, Chonnam National University) ;
  • Gwak, Ji Hye (Photovoltaic Research Group, Korea Institute of Energy Research) ;
  • Kim, Jin Hyeok (Department of Materials Science and Engineering and Optoelectronics Convergence Research Centre, Chonnam National University)
  • Received : 2015.07.10
  • Accepted : 2015.07.16
  • Published : 2015.09.30
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Abstract

Recently, $Cu_2ZnSn(S_xSe_{1-x})_4$ (CZTSSe) has been received a tremendous attraction as light absorber material in thin film solar cells (TFSCs), because of its earth abundance, inexpensive and non-toxic constituents and versatile material characteristics. Kesterite CZTSSe thin films were synthesized by sulfo-selenization of sputtered Cu/Sn/Zn stacked metallic precursors. The sulfo-selenization of Cu/Sn/Zn stacked metallic precursor thin films has been carried out in a graphite box using rapid thermal annealing (RTA) technique. Annealing process was done under sulfur and selenium vapor pressure using Ar gas at $520^{\circ}C$ for 10 min. The effect of tuning Se/(S+Se) precursor composition ratio on the properties of CZTSSe films has been investigated. The XRD, Raman, FE-SEM and XRF results indicate that the properties of sulfo-selenized CZTSSe thin films strongly depends on the Se/(S+Se) composition ratio. In particular, the CZTSSe TFSCs with Se/(S+Se) = 0.37 exhibits the best power conversion efficiency of 4.83% with $V_{oc}$ of 467 mV, $J_{sc}$ of $18.962mA/cm^2$ and FF of 54%. The systematic changes observed with increasing Se/(S+Se) ratio have been discussed in detail.

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References

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