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Electrical Conductivity of Halide Perovskites Follows Expectations from Classical Defect Chemistry

DOI zum Zitieren der Version auf EPub Bayreuth: https://doi.org/10.15495/EPub_UBT_00005795
URN to cite this document: urn:nbn:de:bvb:703-epub-5795-6

Title data

Leupold, Nico ; Seibel, Anna Lena ; Moos, Ralf ; Panzer, Fabian:
Electrical Conductivity of Halide Perovskites Follows Expectations from Classical Defect Chemistry.
In: European Journal of Inorganic Chemistry. (2021) Issue 28 . - pp. 2882-2889.
ISSN 1099-0682
DOI der Verlagsversion: https://doi.org/10.1002/ejic.202100381

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Project information

Project title:
Project's official titleProject's id
Stabile Perowskitsolarzellen durch kontrollierte Kristallisationsprozesse und durch grundlegendes Verständnis der optischen und elektrischen Eigenschaften sowie der DefektchemieMO 1060/32-1
Trockenes Filmprozessieren hybrider Perowskite mit maßgeschneiderten optoelektronischen EigenschaftenPA 3373/3-1

Project financing: Deutsche Forschungsgemeinschaft

Abstract

Defect chemistry is key to understand electrical properties of many functional materials including halide perovskites. However, expectations from defect chemistry about the dependency of defect densities on the doping regime of halide perovskites have not yet been clearly confirmed experimentally. Here, we measure the electrical conductivity of the model halide perovskite Methylammonium Lead Iodide over a wide range of iodine partial pressures. We find that with iodine partial pressure the electrical conductivity changes with different slopes in a double-logarithmic representation, indicating changes of the perovskite conductivity mechanism. Considering differences in the mobilities of the various defect species, we derive expectations about the dependence of the total conductivity of the perovskite as a function of iodine partial pressure. We find iodine vacancies dominating the conductivity at low iodine partial pressures, whereas at higher partial pressures holes govern the total conductivity. We find the concentration of iodide vacancies to be ∼1018 cm−3, in good agreement with the expected values based on intrinsic ionic disorder. Finally, for the case that the intrinsic ionic disorder concentration is overestimated, we elucidate the possibility to explain the conductivity profile by impurity induced acceptor doping in the perovskite. Thus, our work will allow to develop a more fundamental understanding about the electrical properties of halide perovskites.

Further data

Item Type: Article in a journal
Keywords: Iodine partial pressure; Doping; Ion migration; MAPbI3; Impedance Spectroscopy; Powder aerosol deposition method
DDC Subjects: 500 Science > 530 Physics
600 Technology, medicine, applied sciences > 620 Engineering
Institutions of the University: Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics II - Optoelectronics of Soft Matter
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics II - Optoelectronics of Soft Matter > Chair Experimental Physics II - Optoelectronics of Soft Matter - Univ.-Prof. Dr. Anna Köhler
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Language: English
Originates at UBT: Yes
URN: urn:nbn:de:bvb:703-epub-5795-6
Date Deposited: 22 Sep 2021 09:01
Last Modified: 22 Sep 2021 09:02
URI: https://epub.uni-bayreuth.de/id/eprint/5795

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