Charge generation and recombination dynamics in hybrid perovskite solar cells

Natalie Schön^a, Dieter Neher^a, Thomas Brenner^a, Andreas Paulke^a, Roberta Saponaro^a^,^d, Henry Snaith^b, Sam Stranks^b^,^c

^aUniversity of Potsdam, DE, Karl-Liebknecht-Straße, 24-25, Potsdam, Germany

^bUniversity of Oxford, Clarendon Laboratory, Parks rd, Oxford, 0, United Kingdom

^cMassachusetts Institute of Technology (MIT), Massachusetts Avenue, 77, Cambridge, United States

^dMax Planck Institute of Colloids and Interfaces - Potsdam, Research Campus Golm, D-14424 Potsdam, Germany

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Thomas Brenner, 112
Publication date: 5th February 2015

Hybrid perovskite solar cells have shown to be efficient in various device structures, for example in planar, vapour deposited films, in and on mesostructured metal oxides and in solution-processed films of different crystallinity. We study both devices on PEDOT:PSS (“regular”) and mesoporous TiO₂ (“inverted”) with respect to their charge generation and recombination properties. We therefore employ time-delayed collection field measurements (TDCF) and spatially resolved photocurrent microscopy. TDCF allows us to monitor generation and recombination dynamics in a working device at realistic light intensities. We find that recombination in mesoporous TiO₂-based devices resembles monomolecular behavior, whereas PEDOT:PSS based flat devices exhibit second order recombination. Furthermore, exceptionally long carrier lifetimes around 100 μs are found in inverted devices. These differences are related to charge generation measurements and spatially resolved photocurrent measurements, which show that photocurrent generation in perovskite solar cells is non-uniform and that perovskite crystallinity has a pronounced influence on device performance on a submicron length scale.
TDCF working principle (a), extracted charge vs. delay time for inverted (b) and regular (c) solar cells representing recombination dynamics

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