Autor segons l'article: Alvarez, AO; Lédée, F; García-Batlle, M; López-Varo, P; Gros-Daillon, E; Guillén, JM; Verilhac, JM; Lemercier, T; Zaccaro, J; Marsal, LF; Garcia-Belmonte, G; Almora, O
Departament: Enginyeria Electrònica, Elèctrica i Automàtica
Autor/s de la URV: Almora Rodríguez, Osbel / Marsal Garví, Luis Francisco
Paraules clau: X-ray detectors Sensitivity Metal halide perovskites Ion migration Ion diffusion x-ray detectors sensitivity metal halide perovskites ion diffusion
Resum: 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.
Àrees temàtiques: Physical and theoretical chemistry Computer science applications Computational theory and mathematics Chemistry (miscellaneous)
Accès a la llicència d'ús: https://creativecommons.org/licenses/by/3.0/es/
Adreça de correu electrònic de l'autor: osbel.almora@urv.cat lluis.marsal@urv.cat
Identificador de l'autor: 0000-0002-2523-0203 0000-0002-5976-1408
Data d'alta del registre: 2024-04-27
Versió de l'article dipositat: info:eu-repo/semantics/publishedVersion
Enllaç font original: https://pubs.acs.org/doi/10.1021/acsphyschemau.3c00002
URL Document de llicència: http://repositori.urv.cat/ca/proteccio-de-dades/
Referència a l'article segons font original: Acs Physical Chemistry Au. 3 (4): 386-393
Referència de l'ítem segons les normes APA: Alvarez, AO; Lédée, F; García-Batlle, M; López-Varo, P; Gros-Daillon, E; Guillén, JM; Verilhac, JM; Lemercier, T; Zaccaro, J; Marsal, LF; Garcia-Belmo (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
DOI de l'article: 10.1021/acsphyschemau.3c00002
Entitat: Universitat Rovira i Virgili
Any de publicació de la revista: 2023
Tipus de publicació: Journal Publications
Repositori URV