Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 28: Poster: Fundamentals of Perovskite Photovoltaics (joint session CPP, DS, HL)
HL 28.12: Poster
Montag, 20. März 2017, 18:30–21:00, P1A
Scanning force microscopy on perovskites — Ilka M. Hermes1, Victor W. Bergmann1, Dan Li1, Alexander Klasen1, Simon Bretschneider1, Markus Mezger1,2, Rüdiger Berger1, Wolfgang Tremel2, and •Stefan A.L. Weber1,2 — 1Max Planck Institute for Polymer Research, 55128 Mainz, Germany — 2Johannes Gutenberg University, 55128 Mainz, Germany
In perovskite solar cells, nanoscale structures can have a huge impact on the device performance. For understanding this interplay, electrical scanning force microscopy (SFM) methods can correlate the nanoscale morphology with various surface properties: electrical conductivity (conductive SFM), surface potential in Kelvin probe force microscopy, (KPFM) or electromechanical coupling in piezoresponse force microscopy (PFM). This poster provides an overview on our activities in SFM on perovskite films and solar cells. We used KPFM to map the potential distribution on cross sections of perovskite solar cell devices in dark and under illumination, revealing distinct differences in the charging dynamics at different interfaces [1,2]. With PFM on micron-sized perovskite grains we observed a periodically alternating structure reminiscent of ferroelastic domain patterns [3]. Using a SFM under controlled humidity, the effects of reversible hydration in perovskite films on the morphology were studied [4]. Such experiments provide valuable information for the optimization of the light harvesting abilities in these materials and the fabrication processes. [1] Nat. Comm. 2014, 5. [2] ACS AM&I, 2016, 8 (30), 19402. [3] J. Phys. Chem. C (2016), 120, 5724. [4] J. Phys. Chem. C, 2016, 120 (12), 6363.