Collection Losses in Perovksite Solar Cells
Samah Akel a, Thomas Kirchartz a b, Ashish kulkarni a, Yueming Wang a, Uwe Rau a
a IEK5-Photovoltaik, Forschungszentrum Jülich
b 2Faculty of Engineering and CENIDE, University of Duisburg-Essen, Carl-Benz-Str. 199, 47057 Duisburg, Germany
Proceedings of Device Physics Characterization and Interpretation in Perovskite and Organic Materials (DEPERO)
VALÈNCIA, Spain, 2023 October 3rd - 5th
Organizers: Sandheep Ravishankar, Juan Bisquert and Evelyne Knapp
Poster, Samah Akel, 038
Publication date: 14th September 2023

The insufficient extraction of electrons and holes in perovskite solar cells (PSCs) is attributed to the different requirements of the device layers. The figure of merit the exchange velocity (Sexc) as a property of the transport layer (TL) is a key feature that mainly affects the collection. Moreover, the thickness (d) of the perovskite is a crucial enabler of extraction losses, especially at short circuit and low forward bias. Low exchange velocity and high thickness can modulate the density of excess charge carriers inside the absorber leading to a high concentration remains without extraction. Voltage-dependent photoluminescence PL(V) with a combination of numerical simulations and analytical modeling is used to identify the requirements for efficient collection in widely used triple-cation lead-halide PSCs

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