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Article Dans Une Revue ACS Physical Chemistry Au Année : 2023

Ionic field screening in MAPbBr3 crystals revealed from remnant sensitivity in X-ray detection

Résumé

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 (MAPbBr$_3$) 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.
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Dates et versions

hal-04089760 , version 1 (05-05-2023)

Identifiants

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Agustin Alvarez, Ferdinand Lédée, Marisé García-Batlle, Pilar López-Varo, Eric Gros-Daillon, et al.. Ionic field screening in MAPbBr3 crystals revealed from remnant sensitivity in X-ray detection. ACS Physical Chemistry Au, 2023, 3 (4), pp.386-393. ⟨10.1021/acsphyschemau.3c00002⟩. ⟨hal-04089760⟩
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