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Article Dans Une Revue Journal of Applied Physics Année : 2023

Evidence for a build-in remnant field in symmetrically contacted MAPbB$_3$ X-ray detectors

Résumé

Millimeter-thick methylammonium lead tribromide (MAPbBr$_3$) single crystal X-ray detectors have recently raised attention due their high X-ray attenuation efficiency and good charge transport properties. However, an intriguing feature of the photocurrent response of MAPbBr$_3$ detectors has been largely overlooked in the literature. After biaising, transient sensitivity is measured under X-rays at short-circuit (Bias = 0V), thus revealing a large remnant electric field that build-up under bias. Here, we exploit the X-ray sensitivity of MAPbBr$_3$ detectors at zero-bias in order to probe the internal built-in field, as well as to investigate the charge transport properties of the perovskite material. Our model derived from the Hecht equation is able to fully rationalize the response of the detectors both at short-circuit and under moderate applied bias. Moreover, we provide a method for the estimation of the internal electric field, and for the sum of the electrons and holes mobility-lifetime products μ$_e$ τ$_e$$^+$μ$_h$ τ$_h$. This generic method could extent to any perovskite-based X-ray detector exhibiting transient sensitivity at zero-bias.
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Dates et versions

cea-04468082 , version 1 (20-02-2024)

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Ferdinand Ledee, Javier-Alejandro Mayen Guillen, Stephanie Lombard, Julien Zaccaro, Jean-Marie Verilhac, et al.. Evidence for a build-in remnant field in symmetrically contacted MAPbB$_3$ X-ray detectors. Journal of Applied Physics, 2023, 134, pp.195703. ⟨10.1063/5.0170580⟩. ⟨cea-04468082⟩
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