Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Publication date: 6th February 2020
Flash Infrared Annealing (FIRA) method results in pinhole-free layers with micrometer‐size crystalline domains without the use of the antisolvent or any other chemical additives. The fast annealing times (1.7s), and comparable solar cell efficiency compared to the traditional antisolvent-fabricated perovskites make FIRA highly promising for the scale‐up of perovskite solar cells as it is compatible with roll-to-roll methods available on the market, such as doctor-blading, slot-casting. In this work we investigate how the Flash Infrared Annealing affects the crystal growth of MAPbI3 and its dependence on the substrates used (FTO, ITO, Quartz, compact and mesoporous TiO2). We measure the grain size, crystal structure and orientation using Electron Back-Scattered Diffraction (EBSD). We find a highly oriented structure for perovskite annealed by FIRA along the (112) and (224) directions, unusual for MAPbI3 thin films but typically shown by MAPbI3 single crystals, and a consistent crystal rotation within perovskite grains. Besides, we study how the structural properties of the resulting films affect its photophysics. Combining photoluminescence lifetime and spectral maps we show how the growth method affects the steady-state and dynamic optical properties of the resulting films. Our findings directly relate structural properties to the photophysics of lead halide perovskites.
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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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