Ionic Field Screening in MAPbBr3 Crystals Revealed from Remnant Sensitivity in X-ray Detection
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INVESTIGACIONMetadades
Títol
Ionic Field Screening in MAPbBr3 Crystals Revealed from Remnant Sensitivity in X-ray DetectionAutoria
Data de publicació
2023-05-03Editor
American Chemical SocietyISSN
2694-2445Cita bibliogràfica
Alvarez, A. O.; Lédée, F.; García-Batlle, M.; López-Varo, P.; Gros-Daillon, E.; Guillén, J. M.; Verilhac, J. M.; Lemercier, T.; Zaccaro, J.; Marsal, L. F.; Garcia-Belmonte, G.; Almora, O. Ionic Field Screening in MAPbBr3 Crystals Revealed from Remnant Sensitivity in X-ray Detection. ACS Phys. Chem Au 2023, 3, 4, 386-393. https://doi.org/10.1021/acsphyschemau.3c00002Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
https://pubs.acs.org/doi/full/10.1021/acsphyschemau.3c00002Versió
info:eu-repo/semantics/publishedVersionParaules clau / Matèries
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 ... [+]
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. [-]
Publicat a
ACS Physical Chemistry Au, 2023, vol. 3, no 4Entitat finançadora
European Union
Codi del projecte o subvenció
info:eu-repo/grantAgreement/EC/H2020/871336
Drets d'accés
info:eu-repo/semantics/openAccess
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