Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Publication date: 6th February 2020
While the power conversion efficiency of perovskite solar cells has increased enormously in the past decade, the open circuit voltage, Voc, is still below the conceivable limit. Hence, understanding the factors governing and the improvement of the Vocis essential to exploit the full potential of metal halide perovskites (MHPs). Recently, different academic groups reported that the Voc of perovskite solar cells is not determined by the Fermi levels of the transport materials but more related to the Quasi-Fermi level splitting, μF, of the perovskite layers under illumination. Here, we show a generic method to derive the steady-state Quasi-Femi level splitting from basically any pulsed excitation experiment such as TRMC, THz or TA on bare, non-contacted perovskite films. We first present a kinetic model, which is able to fit time-resolved photoconductance traces recorded over almost four orders of magnitude with one set of rate constants and parameters. Next, using these fitting results we calculate the concentrations of excess electrons and holes under continuous AM1.5 excitation. Finally, μF is calculated from the steady-state excess charge carrier concentrations. This new method is applied to previously reported MHP cells and shows that the Voc can approach μF/e closely. We then analyze the kinetic parameters which provide hints to further improve μF/e and hence the Voc. The present method could help to evaluate new perovskite materials, structures or post treatments in an early stage, avoiding the labour-intensive effort to make fully optimized 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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