Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Publication date: 6th February 2020
Hybrid halide perovskites have been attracting extensive interest as next-generation photovoltaic technologies. Specifically, large bandgap metal halide perovskites such as MAPbBr3 offer a range of applications in multijunction solar cells, electrochemical energy storage, electrocatalysis, and LEDs, as well as providing an interesting platform for comparison with the more commonly studied MAPbI3, and mixed-halide perovskites.
It was shown that substituting Br for I increases the chemical stability making MAPbBr3 much more stable under environmental conditions when compared to MAPbI3. We study this increase in stability under environmental conditions and show that it stems from a change in ion migration properties when going from MAPbI3 to MAPbBr3. Furthermore, we investigate the evolution of this behavior in different MAPbBr3 solar cells as a function of the grain size of the active perovskite film. Grain boundaries change ion migration by providing alternative pathways for the ions to migrate, thereby affecting crucial properties of the process such as activation energy and diffusion coefficient. In our work, we use Transient Ion Drift to quantify the activation energies, diffusion coefficients, and concentrations of the mobile ions, and show the ling between grain size, ion migration, and stability.
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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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