Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Efficiency Characteristics of Cu(In,Ga)Se2 Photovoltaic Thin Films According to the Mo:Na Thickness

Mo:Na두께에 따른 Cu(In,Ga)Se2 태양전지 박막의 효율 특성

  • Shin, Younhak (Department of Advanced Materials Engineering, Chungbuk National University) ;
  • Kim, Myunghan (Department of Advanced Materials Engineering, Chungbuk National University)
  • 신윤학 (충북대학교 신소재공학과) ;
  • 김명한 (충북대학교 신소재공학과)
  • Received : 2013.08.19
  • Accepted : 2013.08.24
  • Published : 2013.09.01
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Abstract

We have focused on the conversion efficiency of CIGS thin film solar cell prepared by co-evaporation method as well as the optimization of process condition. The total thickness of back electrode was fixed at 1 ${\mu}m$ and the structural, electric and optical properties of CIGS thin film were investigated by varying the thickness of Mo:Na bottom layer from 0 to 500 nm. From the experimental results, the content of Na was appeared as 0.28 atomic percent when the thickness of Mo:Na layer was 300 nm with compactly densified plate-shape surface morphology. From the XRD measurements, (112) plane was the strongest preferential orientation together with secondary (220) and (204) planes affecting to the crystallization. The lowest roughness and resistivity were 2.67 nm and 3.9 ${\Omega}{\cdot}cm$, respectively. In addition, very high carrier density and hole mobility were recorded. From the optimization of Mo:Na layer, we have achieved the conversion efficiency of 9.59 percent.

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References

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