Regensburg 2019 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 11: PhD-Symposium: Photoluminescence of halide perovskites:
What does it tell us and what not? (joint session DS/HL/AKjDPG)

DS 11.6: Vortrag

Dienstag, 2. April 2019, 11:45–12:00, H32

Temperature dependent charge carrier transport in MAPI single crystal thin films — •Alexander Biewald¹, Richard Ciesielski¹, Nadja Giesbrecht¹, Kathrin Handloser¹, Pablo Docampo², Thomas Bein¹, and Achim Hartschuh¹ — ¹Department Chemie und (CeNS), LMU München, Deutschland — ²School of Electrical and Electronic Engineering, Newcastle, UK

Methylammonium lead iodide (MAPI)-based thin-film solar cells today reach power conversion efficiencies of more than 20 % [1]. The material is prototypical for the large class of perovskite semiconductor materials for photovoltaic applications and is therefore at the focal point of research interest to a global community. Here, we present an all-optical study of the charge carrier diffusion properties in large-crystal MAPI thin films using photoluminescence microscopy [2]. We vary the temperature between 170 K and room temperature, thus remaining in the tetragonal crystal phase [2]. We probe the local material properties of individual crystal grains within a PMMA-coated MAPI thin film and find a steady increase of the diffusion constant towards lower temperatures. In a previous paper we found that grain boundaries in such thin films act as solid walls for diffusing charge carriers [2], which we also see at low temperatures.

[1] M. A. Green, et al., Solar cell efficiency tables (version 52), 2018.

[2] R. Ciesielski, et al., ACS Appl. Mat. & Interfaces. 10 (9), 7974-7981 (2018).

[3] N.O. Yamamuro, et al., J. Phys. Chem. Solids 53 (7), 935-939 (1992).