Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
DOI: https://doi.org/10.29363/nanoge.hopv.2020.061
Publication date: 6th February 2020
The intrinsic physical properties of metal halide perovskites, such as electron-phonon coupling, combined with the inhomogeneities that result from many solution-based thin film deposition processes, motivate a strong emphasis on characterization approaches that elucidate the complex and fascinating relationships between material structure and function across multiple relevant scales. We therefore describe lessons from a spectrum of dynamic imaging measurements that address this important need. First, we show how our development of time-resolved elastic scattering microscopy—with a nanoscale sensitivity—allows us to elucidate how grain boundaries impact charge carrier migration through their lateral- and depth-dependent resistivities in a variety of thin films. While this approach may also be used to detect photoinduced demixing in mixed halide perovskites, we demonstrate the way in which A-cation selection enables the tuning of the extent of demixing at high spatial resolution via cathodoluminescence microscopy. This second approach furthermore facilitates a quantitative mechanistic analysis of the activation energy in the structural phase transition in inorganic lead halide nanostructures. We determine that the conversion from non-perovskite to perovskite phases requires only the energy required to break lead-halide bonds, requiring a disordered region between phases that suggests that the perovskite phase grows above the transition temperature from a nanoscale melt. Correlating the electronic and optical properties with structural ones at the nanoscale with these powerful dynamic imaging approaches provides highly complementary insight into the many enigmatic properties of metal halide perovskites that will need to be addressed to fully develop them into widely adopted photovoltaics.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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