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Enhancing Bismuth Iodide Solar Cells

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BiI3 has favorable photovoltaic properties with an ideal band gap of 1.8 eV and potential processing through evaporation. There has been much research done on solution-processing BiI3 for photovoltaics. However, BiI3 thin films can be fabricated using evaporation techniques as well. Our group has developed a close-space sublimation (CSS) technique for fabricating BiI3 films with control over the crystal orientation. When fabricated by solution processing, the crystals orientation is random. However, when evaporating, moderating the source-substrate temperature difference results in the variance of crystal orientation. A large temperature difference produces vertical crystals, and a small difference produces horizontal crystals.

  • This report represents the work of one or more WPI undergraduate students submitted to the faculty as evidence of completion of a degree requirement. WPI routinely publishes these reports on its website without editorial or peer review.
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Identifier
  • E-project-032019-014024
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Year
  • 2019
Date created
  • 2019-03-20
Location
  • Worcester
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