Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Morphology and Electrical Properties of Back Electrode for Solar Cell Depending on the Mo : Na/Mo Bilayer Thickness

Mo : Na/Mo 이중층 구조 두께에 따른 태양전지 후면전극의 조직 및 전기적 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 : 2013.08.05
  • Accepted : 2013.08.27
  • Published : 2013.09.27
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Abstract

Mo-based thin films are frequently used as back electrode materials because of their low resistivity and high crystallinity in CIGS chalcopyrite solar cells. Mo:Na/Mo bilayer thin films with $1{\mu}m$ thickness were deposited on soda lime glass by varying the thickness of each layer using dc-magnetron sputtering. The effects of the Mo:Na layer on morphology and electrical property in terms of resistivity were systematically investigated. The resistivity increased from $159{\mu}{\Omega}cm$ to $944{\mu}{\Omega}cm$; this seemed to be caused by increased surface defects and low crystallinity as the thickness of Mo:Na layer increased from 100 nm to 500 nm. The surface morphologies of the Mo thin films changed from a somewhat coarse fibrous structures to irregular and fine celled structures with increased surface cracks along the cell boundaries as the thickness of Mo:Na layer increased. Na contents varied drastically from 0.03 % to 0.52 % according to the variation of Mo:Na layer thickness. The change in Na content may be ascribed to changes in surface morphology and crystallinity of the thin films.

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References

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