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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 iodideIlka M. Hermes1, Markus Mezger1,2, David S. Ginger3, Rüdiger Berger1, Kaloian Koynov1, and •Stefan A.L. Weber1,21MPI 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.

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