Thick-junction perovskite X-ray detectors: processing and optoelectronic considerations

Peng, Jiali; Xu, Yalun; Yao, Fang; Lin, Qianqian

doi:10.1039/d2nr01643e

Cited by 15 publications

(15 citation statements)

References 76 publications

(82 reference statements)

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“…Overall, we stress the importance of preventing the so‐called dark current drift [ 37 ] by characterizing the perovskite ionic properties of XRDs, and particularly in X‐ray imaging. The faster the current response, the better is the image quality and the lower is the required radiation dose, which is of most importance in medical imaging.…”

Section: Resultsmentioning

confidence: 99%

Long‐Term Field Screening by Mobile Ions in Thick Metal Halide Perovskites: Understanding Saturation Currents

Almora

Miravet

Gelmetti

et al. 2022

Physica Rapid Research Ltrs

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Metal halide perovskite‐based semiconductor devices with micrometer‐to‐millimeter‐thick perovskite layers show a current response upon polarization which evolves up to several hours, transiting several regimes. This is the case of X‐ray detectors where the use of absorber perovskites produces instabilities in the dark reverse saturation current hindering the signal processing. Even though these phenomena are often attributed to the electronic–ionic conductivity and the interface phenomena in these perovskites, a proper theoretical description is missing. Herein, the numerical simulation study reproduces the main experimental trends and explains the origin of some of the apparently‐always‐increasing current transients in thick perovskite samples. The mobile ion concentration and mobility are correlated with three main transport regimes and interpretation and parameterization are provided to the current saturation time in terms of the ionic screening of the electric field toward the interfaces. The final steady‐state under reverse polarization is found as diffusion‐limited electronic current, which results from abrupt mobile ion depletion proportional to the Debye length in the vicinity of a contact. The conclusions suggest the material optimization of the contact interfaces as a pathway to reduce the long current saturation times in these devices.

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Section: Resultsmentioning

confidence: 99%

Long‐Term Field Screening by Mobile Ions in Thick Metal Halide Perovskites: Understanding Saturation Currents

Almora

Miravet

Gelmetti

et al. 2022

Physica Rapid Research Ltrs

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“…Metal halide perovskite (MHP) solar cells and other optoelectronic devices have drawn enormous attention because of their rapidly increasing power conversion efficiency (PCEs) and cost-effective fabrication. [1][2][3][4][5] Since the first MHP solar cell was reported in 2009, the record efficiency has rapidly grown from 3.8% to 25.7%. [6][7][8][9] This remarkable improvement is achieved by the rational design of solar cell architectures and the efficient defect passivation strategies.…”

Section: Introductionmentioning

confidence: 99%

Grain boundary sliding and distortion on a nanosecond timescale induce trap states in CsPbBr₃: ab initio investigation with machine learning force field

Liu

Vasenko

et al. 2023

Nanoscale

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“…21 An understanding of the variation of the transient properties of perovskite photodetectors over these time scales is currently lacking in the literature, despite this variation being a widely acknowledged feature of the material. 22 Herein, the dynamic behavior in perovskite photodetectors is presented and discussed, highlighting links to mobile defects. This study elucidates two important phenomena in perovskite photodetectors and provides guidelines for the community on how to correctly characterize these devices.…”

Section: ■ Introductionmentioning

confidence: 99%

Identification and Mitigation of Transient Phenomena That Complicate the Characterization of Halide Perovskite Photodetectors

Moseley

Roose

Zelewski

et al. 2023

ACS Appl. Energy Mater.

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Halide perovskites have shown promise to advance the field of light detection in next-generation photodetectors, offering performance and functionality beyond what is currently possible with traditional inorganic semiconductors. Despite a relatively high density of defects in perovskite thin films, long carrier diffusion lengths and lifetimes suggest that many defects are benign. However, perovskite photodetectors show detection behavior that varies with time, creating inconsistent device performance and difficulties in accurate characterization. Here, we link the changing behavior to mobile defects that migrate through perovskites, leading to detector currents that drift on the time scale of seconds. These effects not only complicate reproducible device performance but also introduce characterization challenges. We demonstrate that such transient phenomena generate measurement artifacts that mean the value of specific detectivity measured can vary by up to 2 orders of magnitude even in the same device. The presence of defects can lead to photoconductive gain in photodetectors, and we show batch-to-batch processing variations in perovskite devices gives varying degrees of charge carrier injection and photocurrent amplification under low light intensities. We utilize the passivating effect of aging to reduce the impact of defects, minimizing current drifts and eliminating the gain. This work highlights the potential issues arising from mobile defects, which lead to inconsistent photodetector operation, and identifies the potential for defects to tune photodetection behavior in perovskite photodetectors.

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Thick-junction perovskite X-ray detectors: processing and optoelectronic considerations

Abstract: This review summarizes the processing techniques and optoelectronic design of the perovskite thick-junctions and X-ray detectors, and also points out the key challenges and opportunities, which are promising to explore.

Cited by 15 publications

References 76 publications

Long‐Term Field Screening by Mobile Ions in Thick Metal Halide Perovskites: Understanding Saturation Currents

Long‐Term Field Screening by Mobile Ions in Thick Metal Halide Perovskites: Understanding Saturation Currents

Grain boundary sliding and distortion on a nanosecond timescale induce trap states in CsPbBr₃: ab initio investigation with machine learning force field

Identification and Mitigation of Transient Phenomena That Complicate the Characterization of Halide Perovskite Photodetectors

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Thick-junction perovskite X-ray detectors: processing and optoelectronic considerations

Abstract: This review summarizes the processing techniques and optoelectronic design of the perovskite thick-junctions and X-ray detectors, and also points out the key challenges and opportunities, which are promising to explore.

Cited by 15 publications

References 76 publications

Long‐Term Field Screening by Mobile Ions in Thick Metal Halide Perovskites: Understanding Saturation Currents

Long‐Term Field Screening by Mobile Ions in Thick Metal Halide Perovskites: Understanding Saturation Currents

Grain boundary sliding and distortion on a nanosecond timescale induce trap states in CsPbBr3: ab initio investigation with machine learning force field

Identification and Mitigation of Transient Phenomena That Complicate the Characterization of Halide Perovskite Photodetectors

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Grain boundary sliding and distortion on a nanosecond timescale induce trap states in CsPbBr₃: ab initio investigation with machine learning force field