Local disorder at the phase transition interrupts ambipolar charge carrier transport in large crystal methylammonium lead iodide thin films

Biewald, A., Giesbrecht, N., Bein, T., Docampo, P. , Hartschuh, A. and Ciesielski, R. (2020) Local disorder at the phase transition interrupts ambipolar charge carrier transport in large crystal methylammonium lead iodide thin films. Journal of Physical Chemistry C, 124(38), pp. 20757-20764. (doi: 10.1021/acs.jpcc.0c06240)

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Abstract

The low-temperature transition from a tetragonal to an orthorhombic crystal phase in methylammonium lead iodide (MAPI) is accompanied by drastic changes in the charge carrier mobility around a critical temperature of approximately 164 K. This transition is studied here using photoluminescence (PL) microscopy on large crystal MAPI thin films, which is extremely sensitive to modifications of the charge carrier dynamics and can resolve physical properties on a single-grain level. The key observation is that ambipolar charge carrier diffusion suddenly stops when the temperature falls below the phase transition temperature. From coexisting PL bands and their spatial distribution, it is concluded that the temperature range from just below the phase transition until about 150 K is determined by a mixed phase where small orthorhombic and tetragonal domains coexist. This results in local disorder, which hinders ambipolar charge carrier diffusion.

Item Type:Articles
Additional Information:The authors acknowledge the financial support from the German Federal Ministry of Education and Research (BMBF) via CISOVSKIT (03SF0516B), the Deutsche Forschungsgemeinschaft through the Excellence Cluster e-conversion, and from the Bavarian research network SolTech as well as the UK’s EPSRC, projects EP/S031103/1 and EP/P03148X/1.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Docampo, Dr Pablo
Authors: Biewald, A., Giesbrecht, N., Bein, T., Docampo, P., Hartschuh, A., and Ciesielski, R.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Journal of Physical Chemistry C
Publisher:American Chemical Society
ISSN:1932-7447
ISSN (Online):1932-7455
Published Online:25 August 2020

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