Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effect of Annealing Process Pressure Over Atmospheric Pressure on Cu2ZnSn(S,Se)4 Thin Film Growth

대기압 이상의 열처리 공정압력이 Cu2ZnSn(S,Se)4(CZTSSe) 박막 성장에 미치는 영향

  • Lee, Byeong Hoon (Department of Materials Science and Engineering, Chonnam National University) ;
  • Yoo, Hyesun (Optoelectronic Convergence Research Center, Chonnam National University) ;
  • Jang, Jun Sung (Department of Materials Science and Engineering, Chonnam National University) ;
  • Lee, InJae (Department of Materials Science and Engineering, Chonnam National University) ;
  • Kim, Jihun (Scool of Integrated Technology, Gwangju Institute of Science and Technology) ;
  • Jo, Eunae (Department of Materials Science and Engineering, Chonnam National University) ;
  • Kim, Jin Hyeok (Department of Materials Science and Engineering, Chonnam National University)
  • 이병훈 (전남대학교 신소재공학과) ;
  • 류혜선 (전남대학교 광전자융합기술연구소) ;
  • 장준성 (전남대학교 신소재공학과) ;
  • 이인재 (전남대학교 신소재공학과) ;
  • 김지훈 (광주과학기술원 전기전자컴퓨터공학부) ;
  • 조은애 (전남대학교 신소재공학과) ;
  • 김진혁 (전남대학교 신소재공학과)
  • Received : 2019.07.10
  • Accepted : 2019.08.27
  • Published : 2019.09.27
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Abstract

$Cu_2ZnSn(S,Se)_4(CZTSSe)$ thin film solar cells areone of the most promising candidates for photovoltaic devices due to their earth-abundant composition, high absorption coefficient and appropriate band gap. The sputtering process is the main challenge to achieving high efficiency of CZTSSe solar cells for industrialization. In this study, we fabricated CZTSSe absorbers on Mo coated soda lime glass using different pressures during the annealing process. As an environmental strategy, the annealing process is performed with S and Se powder, without any toxic $H_2Se$ and/or $H_2S$ gases. Because CZTSSe thin films have a very narrow stable phase region, it is important to control the condition of the annealing process to achieve high efficiency of the solar cell. To identify the effect of process pressure during the sulfo-selenization, we experiment with varying initial pressure from 600 Torr to 800 Torr. We fabricate a CZTSSe thin film solar cell with 8.24 % efficiency, with 435 mV for open circuit voltage($V_{OC}$) and $36.98mA/cm^2$ for short circuit current density($J_{SC}$), under a highest process pressure of 800 Torr.

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References

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