Author, as appears in the article.: Alvarez, Agustin O; Ledee, Ferdinand; Garcia-Batlle, Marise; Lopez-Varo, Pilar; Gros-Daillon, Eric; Guillen, Javier Mayen; Verilhac, Jean-Marie; Lemercier, Thibault; Zaccaro, Julien; Marsal, Lluis F; Garcia-Belmonte, Germa; Almora, Osbel
Department: Enginyeria Electrònica, Elèctrica i Automàtica
URV's Author/s: Almora Rodríguez, Osbel / Marsal Garví, Luis Francisco
Keywords: X-ray detectors Sensitivity Metal halide perovskites Ion migration Ion diffusion x-ray detectors sensitivity metal halide perovskites ion diffusion
Abstract: Research on metal halide perovskites as absorbers for X-ray detection is an attractive subject due to the optimal optoelectronic properties of these materials for high-sensitivity applications. However, the contact degradation and the long-term instability of the current limit the performance of the devices, in close causality with the dual electronic-ionic conductivity of these perovskites. Herein, millimeter-thick methylammonium-lead bromide (MAPbBr3) single and polycrystalline samples are approached by characterizing their long-term dark current and photocurrent under X-ray incidence. It is shown how both the dark current and the sensitivity of the detectors follow similar trends at short-circuit (V = 0 V) after biasing. By performing drift-diffusion numerical simulations, it is revealed how large ionic-related built-in fields not only produce relaxations to equilibrium lasting up to tens of hours but also continue to affect the charge kinetics under homogeneous low photogeneration rates. Furthermore, a method is suggested for estimating the ionic mobility and concentration by analyzing the initial current at short-circuit and the characteristic diffusion times.
Thematic Areas: Physical and theoretical chemistry Computer science applications Computational theory and mathematics Chemistry, physical Chemistry (miscellaneous)
licence for use: https://creativecommons.org/licenses/by/3.0/es/
Author's mail: osbel.almora@urv.cat lluis.marsal@urv.cat
Author identifier: 0000-0002-2523-0203 0000-0002-5976-1408
Record's date: 2024-10-12
Papper version: info:eu-repo/semantics/publishedVersion
Link to the original source: https://pubs.acs.org/doi/10.1021/acsphyschemau.3c00002
Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
Papper original source: Acs Physical Chemistry Au. 3 (4): 386-393
APA: Alvarez, Agustin O; Ledee, Ferdinand; Garcia-Batlle, Marise; Lopez-Varo, Pilar; Gros-Daillon, Eric; Guillen, Javier Mayen; Verilhac, Jean-Marie; Lemer (2023). Ionic Field Screening in MAPbBr3 Crystals Revealed from Remnant Sensitivity in X-ray Detection. Acs Physical Chemistry Au, 3(4), 386-393. DOI: 10.1021/acsphyschemau.3c00002
Article's DOI: 10.1021/acsphyschemau.3c00002
Entity: Universitat Rovira i Virgili
Journal publication year: 2023
Publication Type: Journal Publications