KSC Seminar: Managing the built-in field and internal energetics for high-performance and stable perovskite solar cells
About the Speaker
Martin Stolterfoht is leading the Perovskite Subgroup within the Soft Matter Physics Group at the University of Potsdam. He completed his Master’s degree in Physics at the University of Graz, Austria in 2012 and obtained his Ph.D. at the University of Queensland, Australia in 2016. His research is focused on providing a fundamental description of thin-film solar cell operation and charge recombination processes from picoseconds to the steady state through electro-optical measurements and numerical modeling. He also aims at improving perovskite single and multi-junction solar cells through the identification and suppression of recombination losses.
Abstract of the Talk
Perovskite semiconductors have demonstrated outstanding external luminescence quantum yields (>50%), enabling high power conversion efficiencies (PCEs) similar to GaAs (~29%). However, the precise conditions to advance to this efficiency regime are not well understood. Moreover, there remain critical challenges regarding perovskite stability which has significant implications for the real-world energy yield and the prospect of widespread commercialization of perovskite photovoltaics (PV). This talk will demonstrate a recent understanding concerning the internal energetics and the built-in field in perovskite solar cells, both of which control various aspects of open-circuit voltage losses and overall device performance. The findings are corroborated by numerical drift-diffusion simulations which lay out the path to further efficiency improvements. For device stability, the discussion will also include how the screening of internal potential has a profound impact on the initial degradation of perovskite single-junction and tandem photovoltaics due to the creation of mobile ions under external stressors such as light and heat.
Wednesday, September 7, 2022, from 12:00 PM – 1:00 PM
Auditorium between Buildings 4 & 5
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