Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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The Physical Properties and Efficiencies of Cu(In,Ga)Se2 Thin Films Depending on the Mo:Na Thickness

Mo:Na 두께에 따른 Cu(In,Ga)Se2 박막의 물성과 효율변화

  • 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 : 2013.12.11
  • Accepted : 2014.01.28
  • Published : 2014.03.27
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Abstract

To realize high-performance thin film solar cells, we prepared CIGS by the co-evaporation technique on both sodalime and Corning glass substrates. The structural and efficient properties were investigated by varying the thickness of the Mo:Na layer, where the total thickness of the back contact was fixed at 1${\mu}m$. As a result, when the Mo:Na thickness was 300 nm on soda-lime glass, the measured Na content was 0.28 %, the surface morphology was a plate-like compact structure, and the crystallinity by XRD showed a strong peak of (112) preferential orientation together with relatively intense (220) and (204) peaks as the secondary phases influenced crystal formation. In addition, the substrates on soda-lime glass effected the lowest surface roughness of 2.76 nm and the highest carrier density and short circuit current. Through the optimization of the Mo:Na layer, a solar conversion efficiency of 11.34% was achieved. When using the Corning glass, a rather low conversion efficiency of 9.59% was obtained. To determine the effects of the concentration of sodium and in order to develop a highefficiency solar cells, a very small amount of sodium was added to the soda lime glass substrate.

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