Regensburg 2019 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 2: Hybrid and Perovskite Photovoltaics I
CPP 2.4: Vortrag
Montag, 1. April 2019, 10:30–10:45, H18
Probing Charge Carrier Dynamics in Perovskite Solar Cells — •Christian Wolff1, Sean Bourelle2, Sascha Feldmann2, Felix Deschler2, and Dieter Neher1 — 1Institut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Str. 24-25, Potsdam, Germany — 2Cavendish Laboratory, Department of Physics, University of Cambridge, JJ Thomson Ave., Cambridge, UK
Photogenerated charge carriers in solar cells have different pathways of recombining. The ideal pathway is external recombination while delivering power to a consumer. In parallel charge carriers may recombine radiatively or nonradiatively in the bulk of the absorber, at surface states, within other functional layers, or across internal interfaces. One major challenge in solar cell research is to identify the pathway, order and rate of these processes. In this contribution we probe the fate of charge carriers in fully functioning devices. We employ time-resolved and steady state absorption, luminescence and charge extraction experiments and provide a consistent picture of the dominating recombination processes at relevant carrier densities. We are able to show that the recombination under 1 sun illumination is dominated by a first order process that we attribute to interfacial recombination, while at higher intensities a radiative second order is prevailing. The results suggest that unlike other previous reports the recombination process in full devices follows the simple rate equation dn/dt = −k1n+k2n2 +k3n3, with k1∼107s−1, k2∼10−11 cm−3s−1 and k3∼10−33cm−6s−1 and that there is no need to include mixed-order processes.