Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 84: Focus Session (CPP with HL): Hybrid photovoltaics and perovskites II

HL 84.4: Talk

Thursday, March 19, 2015, 16:15–16:30, C 130

Time-resolved confocal microscopy of hybrid metal halide perovskite thin films — •Kathrin Bader, Richard Ciesielski, Nadja Giesbrecht, Johann M. Feckl, Irene Grill, Fabian C. Hanusch, Thomas Bein, Pablo Docampo, Matthias Handloser, and Achim Hartschuh — Department Chemie and CeNS, LMU Munich, Germany

Organic-inorganic metal halide perovskite solar cells (PSCs) have seen an unprecedented development over the past 4 years due to their potential to fulfill most requirements for large scale production. Extremely fast progress in the field of perovskite absorbers has taken solar cell efficiencies from 10 % in 2012 [1] to over 19 % in 2014 [2]. A crucial parameter for the functioning of solar cells is a long charge carrier diffusion length that allows to effectively collect photogenerated charges. To determine this diffusion length several experimental methods have been reported that either provide indirect information or use electrical contacts [3,4]. We used time-resolved laser scanning confocal microscopy to visualize the transport range and timescale of photo-excited species within the film. The experimentally observed transport length range up to several microns under high light intensity conditions. Our results help to explain the high short circuit currents that can be achieved in PSCs. Financial support by the DFG through the Nanosystems Initiative Munich (NIM) is gratefully acknowledged. [1] M. M. Lee et al., Science 338, 643 (2012) [2] H. Zhou et al., Science 345, 542 (2014) [3] S. D. Stranks et al., Science 342, 6156 (2013) [4] E. Edri et al., Nat. Commun. 5, 3461 (2014)