Graduate Thesis Or Dissertation
 

Electronic Stability of Metal Halide Perovskites

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/wd3763999

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  • Despite near unanimous opinion on the consequences of climate change by scientific community, the rate at which carbon is emitted into the atmosphere continues to increase. The need for a clean and sustainable source of energy is therefore one of humankind's most urgent challenges. Solar energy is the most abundant energy source on Earth and the only one which is external to the planet. Metal Halide Perovskites (MHPs) are up-and-coming class of material that is spotlighted recently in solar cell community. The power conversion efficiency (PCE) of solar cells based on MHP has surpassed that of polycrystalline silicon based solar cells, despite being processable from low temperature. MHPs are an ionic material that is composed of two types of cations and one anion in the 1:1:3 ratio. This class of material is a good candidate for solar cell applications with excellent optoelectronic properties such as high absorption coefficient, high carrier mobility and long carrier lifetime. However, the most significant remaining barriers to commercialization are their poor stability under ambient conditions along with the toxicity of lead (Pb). A lot of research is ongoing to improve electronic stability of this class of material and it is mainly carried out with finalized devices. One of the main causes for instability is intrinsic property of the material itself, which can be ambiguous when studying the material in a completed device. In this context, a time-resolved microwave conductivity (TRMC) is used to analyze electronic properties of solution processed MHP thin films. TRMC enables one to study the electronic properties of materials without electrical contacts, hence enabling much more decisive statements to be made on the properties of the material. TRMC was applied to a range of MHPs in various environments including different over-annealing and humidity conditions. Moreover, by applying distinct functions to TRMC, changes in dielectric constant under illumination are studied as well as variability of mobilities within a sample. Finally, electronic properties were compared for a range of lead iodide perovskites depending on the cations.
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file details Dissertation_MJHong.pdf 2021-12-23 Público Baixar