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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 3: Fundamentals of Perovskite Photovoltaics I (joint session CPP/DS/HL)

CPP 3.8: Vortrag

Montag, 20. März 2017, 12:30–12:45, ZEU 222

Reduced Recombination for High-Open-Circuit Voltages in CH3NH3PbI3 Solar Cells — •Christian M. Wolff¹, Fengshuo Zu², Andreas Paulke¹, Lorena Perdigon Toro¹, Norbert Koch², and Dieter Neher¹ — ¹Universität Potsdam, Institut für Physik und Astronomie — ²Humboldt-Universität zu Berlin, Institut für Physik

Perovskite solar cells with all-organic transport layers have shown efficiencies rivalling their counterparts that employ inorganic transport layers while avoiding high temperature processing. We investigate how the choice of the fullerene derivative employed in the electron-transporting layer of inverted perovskite cells affects the open circuit voltage. Non-radiative recombination mediated by the electron-transporting layer is the determining factor for the open-circuit voltages in our cells. By inserting an ultra thin layer of an insulating polymer between the active CH3NH3PbI3 perovskite and the fullerene layer, external radiative efficiencies of up to 0.3%, open-circuit voltages (Voc) as high as 1.16V and with efficiencies up to 19.4% were realised. Our results show that reduction of non-radiative recombination due to charge-blocking at the perovskite/organic interface is more important than proper alignment in the search for ideal selective contacts for high Voc.