Berlin 2018 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 58: Organic Thin Films, Organic-Inorganic Interfaces: Session I (joint session DS/CPP)

CPP 58.6: Vortrag

Mittwoch, 14. März 2018, 17:45–18:00, H 0111

Grain boundaries and charge carrier diffusion in large crystal MAPI thin films — •Richard Ciesielski¹, Frank Schäfer¹, Nicolai Hartmann¹, Nadja Giesbrecht¹, Thomas Bein¹, Pablo Docampo², and Achim Hartschuh¹ — ¹Department Chemie und Center for Nanoscience (CeNS), LMU München, Deutschland — ²School of Electrical and Electronic Engineering, Newcastle University, United Kingdom

Micro- and nanocrystalline methyl-ammonium lead-iodide (MAPI)-based thin film solar cells today reach power conversion efficiencies of up to 20%. We investigate the impact of grain boundaries on charge carrier transport in large crystal MAPI thin films using time-resolved photoluminescence (PL) microscopy and numerical model calculations. While long-ranged diffusive charge carrier transport is observed within single crystals, no transport occurs across the grain boundaries. The observed PL transients are found to crucially depend on the microscopic geometry of the crystal and the point of observation. Our experimental results show no quenching or additional loss channels due to grain boundaries for the studied material, which thus do not negatively effect the performance of derived thin film devices.