Journal of the Korean Physical Society

Korean Physical Society (한국물리학회)
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Flexible Solar Cells with a Cu(In,Ga)Se2 Absorber Grown by Using a Se Thermal Cracker on a Polyimide Substrate

  • PARK, Soo-Jeong (Electronics and Telecommunications Research Institute, Korea and Korea University of Science and Technology) ;
  • CHUNG, Yong-Duck (Electronics and Telecommunications Research Institute, Korea and Korea University of Science and Technology) ;
  • LEE, Woo-Jung (Electronics and Telecommunications Research Institute) ;
  • CHO, Dae-Hyung (Electronics and Telecommunications Research Institute) ;
  • WI, Jae-Hyung (Electronics and Telecommunications Research Institute) ;
  • HAN, Won-Seok (Electronics and Telecommunications Research Institute) ;
  • CHO, Yousuk (JMON. Co.,Ltd.) ;
  • YOON, Jong-man (JMON. Co.,Ltd.)
  • Received : 2013.12.07
  • Accepted : 2014.03.18
  • Published : 2015.01.15
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Abstract

A polyimide substrate was used for the fabrication of flexible $Cu(In,Ga)Se_2$ (CIGS) thin-film solar cells. To deposit a stable Mo layer on a flexible substrate, we measured the residual stress in the polyimide film after the deposition of a Mo layer by varying the process pressure. A CIGS absorber was deposited on a Mo layer at a growth temperature below $500^{\circ}C$ by using a Se thermal cracker and various cracking zone temperatures ($T_C$) to improve the reactivity of Se due to the low process temperature. To investigate the effect of Na on the efficiency of a flexible CIGS solar cell, we deposited a Mo:Na layer as a source of Na between the Mo layer and the polyimide substrate. In case of the flexible CIGS solar cell fabricated under the condition of a $T_C$ of $800^{\circ}C$ with a Mo:Na layer, the highest cell efficiency was achieved at 10.76% without an anti-reflection coating, which is significantly increased by 4% compared to the efficiency of a solar cell without the Mo:Na layer.

Keywords

Acknowledgement

Supported by : Korea Institute of Energy Technology Evaluation and Planning (KETEP)

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