Current Photovoltaic Research

Korea Photovoltaic Society (한국태양광발전학회)
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Mechanochemically Synthesized Cu2Zn(Sn,Ge)S4 Nanocrystals and Their Application to Solar Cells

기계화학적 방법으로 합성한 Cu2Zn(Sn,Ge)S4 나노결정과 이를 이용하여 제조한 태양전지

  • Park, Bo-In (Center for Materials Architecturing, Korea Institute of Science and Technology) ;
  • Lee, Seung Yong (Center for Materials Architecturing, Korea Institute of Science and Technology) ;
  • Lee, Doh-Kwon (Department of Nanomaterials Science and Engineering, Korea University of Science and Technology)
  • 박보인 (한국과학기술연구원, 물질구조제어연구센터) ;
  • 이승용 (한국과학기술연구원, 물질구조제어연구센터) ;
  • 이도권 (과학기술연합대학교, 나노재료공학과)
  • Received : 2016.09.02
  • Accepted : 2016.09.06
  • Published : 2016.09.30
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Abstract

$Cu_{1.8}Zn_{1.2}(Sn_{1-x}Ge_x)S_4$ (CZTGeS) nanocrystals were mechanochemically synthesized from elemental precursor powders without using any organic solvents and any additives. The composition of CZTGeS nanocrystals were systematically varied with different Ge mole fraction (x) from 0.1 to 0.9. The XRD, Raman spectroscopy, high-resolution TEM, and diffuse reflectance studies show that the as-synthesized CZTGeS nanocrystals exhibited consistent changes in various structural and optical properties as a function of x, such as lattice parameters, wave numbers for $A_1$ Raman vibration mode, interplanar distances (d-spacing), and optical bandgap energies. The bandgap energy of the synthesized CZTGeS nanocrystals gradually increases from 1.40 to 1.61 eV with increasing x from 0.1 to 0.9, demonstrating that Ge-doping is useful means to tune the bandgap of mechanochemically synthesized nanocrystals-based kesterite thin-film solar cells. The preliminary solar cell performance is presented with an efficiency of 3.66%.

Keywords

References

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