Long term Surface and Bulk Currents with Space-Charge Effects in Lead Halide Perovskites
Osbel Almora a, Gebhard J. Matt b, Marisé García-Batlle a, Germà Garcia-Belmonte a
a Institute of Advanced Materials (INAM), Universitat Jaume I, Castelló de la Plana, Castelló 12006, Spain
b Institute of Materials for Electronics and Energy Technology (i-MEET), Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg Martensstrasse 7, 91058 Erlangen, Germany
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
Oral, Osbel Almora, presentation 088
DOI: https://doi.org/10.29363/nanoge.hopv.2022.088
Publication date: 20th April 2022

Lead halide single crystals and thick pellets have attracted attention for application in ionizing-radiation detection. Yet, the mixed ionic-electronic conductivity of these materials results in current instability and hysteretic artifacts that hinders the long-term device operation. Herein, we discuss on the electrical performance of several metal-halide perovskites such as MAPbI3, MAPBBr3 and CsPbBr3 in the timescale of hours. Our analyses include time-of-flight mobility measurements, impedance spectroscopy and chronoamperometries in different configutations. Our experiments indicate the formation of several regimes of space-charge-limited current (SCLC) with a major contribution from the surface mobile conductivity over the bulk component. We show that the ionic-SCLC seems to be an operational mode, despite one can design experiments to neglect the transport contribution of the mobile ions.

We acknowledge the funding from the European Union's Horizon 2020 research and innovation program under the Photonics Public Private Partnership (www.photonics21.org) with the project PEROXIS under the grant agreement N° 871336.

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