Rao, Pratap M.
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.
Worcester Polytechnic Institute
Major Qualifying Project
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