Moving Ions Vary Electronic Conductivity in Lead Bromide Perovskite Single Crystals through Dynamic Doping
Marise Garcia-Batlle a, Oriane Baussens b, Smaïl Amari c, Eric Gros-Daillon b, Jean-Marie Verilhac c, Julien Zaccaro d, Antonio Guerrero a, Germà Garcia-Belmonte a
a Universitat Jaume I, Institute of Advanced Materials (INAM) - Spain, Avinguda de Vicent Sos Baynat, Castelló de la Plana, Spain
b CEA Grenoble University, Avenue des Martyrs, 17, Grenoble, France
c CEA Grenoble University, Avenue des Martyrs, 17, Grenoble, France
d Grenoble Alpes University, CNRS, Grenoble INP, Institut Néel, F38042 Grenoble France, France
Proceedings of International Conference on Impedance Spectroscopy and Related Techniques in Metal Halide Perovskites (PERIMPED)
Online, Spain, 2020 October 6th - 7th
Organizers: Juan Bisquert, Bruno Ehrler and Eline Hutter
Poster, Marise Garcia-Batlle, 006
Publication date: 25th September 2020

Metal halide perovskite single crystals are being explored as functional materials for a variety of optoelectronic applications. Among others, solar cells, field effect transistors and X- and g-ray detectors have shown improved performance and stability. However, a general uncertainty exists about the relevant mechanisms governing the electronic operation. This is caused by the presence of mobile ions and how these defect species alter the internal electrical field, interact with the contact materials or modulate electronic properties. Here, a set of high quality thick methylammonium lead tribromide single crystals contacted with low reactivity chromium electrodes are analyzed by impedance spectroscopy. Through examination of the sample resistance evolution with bias and releasing time, it is revealed that an interplay exists between the perovskite electronic conductivity and the defect distribution within the crystal bulk. Ion diffusion after bias removing changes the local doping density then governing the electronic transport. These findings indicate that the coupling between ionic and electronic properties relies upon a dynamic doping effect caused by moving ions that act as mobile dopants. In addition to electronic features, our analysis extracts values for the ion diffusivity in the range of 10-8 cm2 s-1 in good agreement with other independent measurements.    

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