Surface versus Bulk Currents and Ionic Space-Charge Effects in CsPbBr3 Single Crystals

Almora Rodriguez O, Matt G, These A, Kanak A, Levchuk I, Shrestha S, Osvet A, Brabec C, Garcia-Belmonte G (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Journal of Physical Chemistry Letters American Chemical Society

Book Volume: 13

Pages Range: 3824-3830

Journal Issue: 17

DOI: 10.1021/acs.jpclett.2c00804

Abstract

CsPbBr3 single crystals have potential for application in ionizing-radiation detection devices due to their optimal optoelectronic properties. Yet, their mixed ionic-electronic conductivity produces instability and hysteretic artifacts hindering the long-term device operation. Herein, we report an electrical characterization of CsPbBr3 single crystals operating up to the time scale of hours. Our fast time-of-flight measurements reveal bulk mobilities of 13-26 cm(2) V-1 s(-1) with a negative voltage bias dependency. By means of a guard ring (GR) configuration, we separate bulk and surface mobilities showing significant qualitative and quantitative transport differences. Our experiments of current transients and impedance spectroscopy indicate the formation of several regimes of space-charge-limited current (SCLC) associated with mechanisms similar to the Poole-Frenkel ionized-trap-assisted transport. We show that the ionic-SCLC seems to be an operational mode in this lead halide perovskite, despite the fact that experiments can be designed where the contribution of mobile ions to transport is negligible.

Authors with CRIS profile

Osbel Almora Rodriguez Institute Materials for Electronics and Energy Technology (i-MEET) Gebhard Matt Institute Materials for Electronics and Energy Technology (i-MEET) Albert These Institute Materials for Electronics and Energy Technology (i-MEET) Ievgen Levchuk Institute Materials for Electronics and Energy Technology (i-MEET) Shreetu Shrestha Institute Materials for Electronics and Energy Technology (i-MEET) Andres Osvet Institute Materials for Electronics and Energy Technology (i-MEET) Christoph Brabec Institute Materials for Electronics and Energy Technology (i-MEET)

Involved external institutions

Yuriy Fedkovych Chernivtsi National University UA Ukraine (UA)

How to cite

APA:

Almora Rodriguez, O., Matt, G., These, A., Kanak, A., Levchuk, I., Shrestha, S.,... Garcia-Belmonte, G. (2022). Surface versus Bulk Currents and Ionic Space-Charge Effects in CsPbBr3 Single Crystals. Journal of Physical Chemistry Letters, 13(17), 3824-3830. https://dx.doi.org/10.1021/acs.jpclett.2c00804

MLA:

Almora Rodriguez, Osbel, et al. "Surface versus Bulk Currents and Ionic Space-Charge Effects in CsPbBr3 Single Crystals." Journal of Physical Chemistry Letters 13.17 (2022): 3824-3830.

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