Interface Optimization via Fullerene Blends Enables Open‐Circuit Voltages of 1.35 V in CH3NH3Pb(I0.8Br0.2)3 Solar Cells
Johanna Siekmann a
a Forschungszentrum Jülich, IEK5-Photovoltaics, Jülich, Germany
Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Online, Spain, 2021 May 24th - 28th
Organizers: Marina Freitag, Feng Gao and Sam Stranks
Poster, Johanna Siekmann, 185
Publication date: 11th May 2021
ePoster: 

The biggest challenge for wide bandgap perovskite solar cells (PSC) is to reduce nonradiative recombination to generate high open-circuit voltages. We exceed Voc of 1.35 V by optimization of the electron transport layer via the use of different fullerenes and fullerene blends. We show that a good interface and improved energy level alignment can increase the power conversion efficiency up to 18.9%.

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