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Ionic Field Screening in MAPbBr3 Crystals Revealed from Remnant Sensitivity in X-ray Detection

  • Identification data

    Identifier: imarina:9320439
    Authors:
    Alvarez, Agustin OLedee, FerdinandGarcia-Batlle, MariseLopez-Varo, PilarGros-Daillon, EricGuillen, Javier MayenVerilhac, Jean-MarieLemercier, ThibaultZaccaro, JulienMarsal, Lluis FGarcia-Belmonte, GermaAlmora, Osbel
    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.
  • Others:

    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
  • Keywords:

    Chemistry (Miscellaneous),Chemistry, Physical,Computational Theory and Mathematics,Computer Science Applications,Physical and Theoretical Chemistry
    X-ray detectors
    Sensitivity
    Metal halide perovskites
    Ion migration
    Ion diffusion
    x-ray detectors
    sensitivity
    metal halide perovskites
    ion diffusion
    Physical and theoretical chemistry
    Computer science applications
    Computational theory and mathematics
    Chemistry, physical
    Chemistry (miscellaneous)
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