Sandheep Ravishankar

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Halide perovskite solar cells have emerged as a significant photovoltaic technology for commercial applications, due to their high power conversion efficiencies and relative ease of fabrication. However, further improvement in their performance is limited mainly by non-radiative recombination losses due to defect densities in the bulk and interfaces of the solar cell, in addition to charge extraction losses related to transporting electrons and holes from the perovskite layer to the electrodes, via the low-mobility transport layers.
In this talk, I will explain how to characterize these loss mechanisms using a combination of luminescence and optoelectronic measurements, both in the time and frequency domain. Through the development of analytical/semi-analytical models in combination with drift-diffusion simulations, we develop data analysis methods that allow determination of characteristic parameters related to these loss mechanisms. Such a strategy allows for a physics-informed optimisation of these solar cells for improved performance, while providing a deeper understanding of their physics of operation

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FZJ
PH2
Contact: Markus Grüninger / Matteo Cacco