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Photoluminescence-Based Characterization of Charge Extraction and Recombination in Halide-Perovskite Based Solar Cells
Halide-perovskite based solar cells have seen a meteoric rise in efficiency since their first introduction in 2009. Today, with reported photovoltaic conversion efficiencies exceeding 25 %, they are closing in on the established silicon technology that is currently dominating the market. In order to further improve upon the progress that has been made it is imperative to understand the losses and limitations still prevalent in devices and the underlying fabrication processes. This thesis examines the limitations of charge carrier extraction in perovskite solar cells and the corresponding implications for charge carrier distribution, recombination and the observed series resistance of a device. In order to gain insight into these properties, fabricated cells are characterized and the obtained sets of data are approximated by drift-diffusion simulations. Specifically the solar cells are investigated with respect to their current-voltage behaviour under illumination and in the dark as well as their voltage-dependent luminescence yield under differing illumination conditions. From these data sets fundamental characteristics of the cells such as the quasi-Fermi level splitting in the absorber, the ideality factor and the series resistance are determined. Subsequently an approximation of all the collected data with simulations gives insight into the inner workings of the cells with respect to charge carrier distribution, elecric field distribution and recombination pathways. Perovskite solar cells employ markedly different cell architectures than for example silicon-based devices, there are various different structures that are in use. Therefore a number of different types of cell architectures are simulated and the behaviour of the aforementioned data sets are elucidated as well as the band diagrams under differing conditions with respect to illumination and externally applied voltage. Special consideration is given to cells with a field free absorber due to a redistribution of mobile ions as well as to architectures ...
Photoluminescence-Based Characterization of Charge Extraction and Recombination in Halide-Perovskite Based Solar Cells
Halide-perovskite based solar cells have seen a meteoric rise in efficiency since their first introduction in 2009. Today, with reported photovoltaic conversion efficiencies exceeding 25 %, they are closing in on the established silicon technology that is currently dominating the market. In order to further improve upon the progress that has been made it is imperative to understand the losses and limitations still prevalent in devices and the underlying fabrication processes. This thesis examines the limitations of charge carrier extraction in perovskite solar cells and the corresponding implications for charge carrier distribution, recombination and the observed series resistance of a device. In order to gain insight into these properties, fabricated cells are characterized and the obtained sets of data are approximated by drift-diffusion simulations. Specifically the solar cells are investigated with respect to their current-voltage behaviour under illumination and in the dark as well as their voltage-dependent luminescence yield under differing illumination conditions. From these data sets fundamental characteristics of the cells such as the quasi-Fermi level splitting in the absorber, the ideality factor and the series resistance are determined. Subsequently an approximation of all the collected data with simulations gives insight into the inner workings of the cells with respect to charge carrier distribution, elecric field distribution and recombination pathways. Perovskite solar cells employ markedly different cell architectures than for example silicon-based devices, there are various different structures that are in use. Therefore a number of different types of cell architectures are simulated and the behaviour of the aforementioned data sets are elucidated as well as the band diagrams under differing conditions with respect to illumination and externally applied voltage. Special consideration is given to cells with a field free absorber due to a redistribution of mobile ions as well as to architectures ...
Photoluminescence-Based Characterization of Charge Extraction and Recombination in Halide-Perovskite Based Solar Cells
Grabowski, David Adrian (author) / Kirchartz, Thomas
2023-10-24
Theses
Electronic Resource
English
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