Regensburg 2019 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 2: Hybrid and Perovskite Photovoltaics I
CPP 2.11: Vortrag
Montag, 1. April 2019, 12:30–12:45, H18
Anisotropic charge carrier diffusion in methylammonium lead iodide — Ilka M. Hermes1, Markus Mezger1,2, David S. Ginger3, Rüdiger Berger1, Kaloian Koynov1, and •Stefan A.L. Weber1,2 — 1MPI for Polymer Research, Mainz, Germany — 2Institute of Physics, JGU Mainz, Germany — 3University of Wahsington, Seattle, USA
In this combined piezoresponse force microscopy (PFM) and local time-resolved photoluminescence (PL) study, we correlate the charge carrier dynamics on large (>10µm) isolated methylammonium lead iodide grains to the arrangement of ferroelastic twin domains[1]. Using PL-microscopy, we measured the carrier diffusion parallel and perpendicular to the twin domain stripes. The diffusion parallel to the domains was significantly faster than perpendicular to the domains, resulting in a distinct anisotropy in the carrier dynamics. Our results demonstrate that controlling the strain during crystal growth could offer a way to enhance carrier extraction in perovskite solar cells. [1] J. Phys. Chem. C, 2016, 120, 5724.