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1 results

  • Nanostructured Transparent Conductive Oxides for Photovoltaic Applications

  • Roger E. Welser, Adam W. Sood, Jaehee Cho, E. Fred Schubert, Jennifer L. Harvey, Nibir K. Dhar, Ashok K. Sood
  • Journal:
    MRS Online Proceedings Library Archive / Volume 1493 / 2013
    Published online by Cambridge University Press:
    18 January 2013, pp. 23-28
    Print publication:
    2013

  • Oblique-angle deposition is used to fabricate indium tin oxide (ITO) optical coatings with a porous, columnar nanostructure. Nanostructured ITO layers with a reduced refractive index are then incorporated into antireflection coating (ARC) structures with a step-graded refractive index design, enabling increased transmittance into an underlying semiconductor over a wide range of wavelengths of interest for photovoltaic applications. Low-refractive index nanostructured ITO coatings can also be combined with metal films to form an omnidirectional reflector (ODR) structure capable of achieving high internal reflectivity over a broad spectrum of wavelengths and a wide range of angles. Such conductive high-performance ODR structures on the back surface of a thin-film solar cell can potentially increase both the current and voltage output by scattering unabsorbed and emitted photons back into the active region of the device.