Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.211
Publication date: 6th July 2018
Metal-halide perovskites have emerged as promising solution-processable semiconductors for optoelectronics applications. These materials show unexpectedly high luminescence yields and long carrier lifetimes under operating conditions. Facile changes in composition during fabrication can be employed to control their optical properties, and the nature of electronic states. Recently, the ad-mixture of monovalent cations to the precursor solutions has demonstrated enhanced luminescence yields and optoelectronic performance, which harvests photon-recycling effects.
The properties and dynamics of the perovskites’ electronic states are controlled by the crystal structure and symmetry. Strong spin-orbit coupling is predicted to introduce Rashba-type state splitting in the electronic band structure. Together with the soft crystal structure of the perovskite lattice, it is likely that dynamic changes occur in the electronic states during their lifetime. So far, it is not understood how such effects change after optical excitation and how they proceed during relaxation of electronic states.
In this talk I will present how we use spectroscopic techniques to study the dynamics of electronic states and crystal structure in metal-halide perovskites on ultrafast timescales. I will report results on layered and bulk lead-halide perovskites, but also on more sustainable lead-free variants. I will discuss how the crystal structure affects the properties of electronic states, and how we can use these modifications to create novel optoelectronic devices.
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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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