Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.295
Publication date: 18th July 2019
Thin-film perovskite solar cells (PSCs), where the record efficiency has rocketed from under 4% to over 24% (comparable to silicon solar cells) in just ten years, offer unprecedented promise of low-cost, high-efficiency renewable electricity generation. Pb-containing organic-inorganic halide perovskite (OIHP) materials at the heart of PSCs have unique structures, which entail rotating organic cations inside inorganic cages, imparting them with desirable optical and electronic properties.To exploit these properties for PSCs application, the reliable deposition of high-quality OIHP thin films of varrious compositions and structures over large areas is critically important. The microstructures and grain-boundary networks in the resulting polycrystalline OIHP thin films are equally important as they control the PSC performance and stability. Fundamental phenomena pertaining to synthesis, crystallization, coarsening, microstructural evolution, and grain-boundary functionalization involved in the processing of OIHP thin films for PSCs will be discussed with specific examples. In addition, the discovery of new classes of Pb-free halide perovskites (all-inorganic, organic-inorganic, low-dimensional), together with the demonstration of viable PSCs based on these new materials, will be presented. Furthermore, the unique mechanical behavior of halide perovskites, and its implication on the reliability of PSCS, will be discussed. The overall goal of our research is to have deterministic control over the scalable processing of tailored halide perovskite thin films with desired compositions, phases, dimensionalities, microstructures, and grain-boundary networks for scalable, efficient, stable, and reliable PSCs of the future.
This research is funded by the National Science Foundation and the Office of Naval Research.
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