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Dark current modeling of thick perovskite X-ray detectors.

ABSTRACT: Metal halide perovskites (MHPs) have demonstrated excellent performances in detection of X-rays and gamma-rays. Most studies focus on improving the sensitivity of single-pixel MHP detectors. However, little work pays attention to the dark current, which is crucial for the back-end circuit integration. Herein, the requirement of dark current is quantitatively evaluated as low as 10^-9 A/cm² for X-ray imagers integrated on pixel circuits. Moreover, through the semiconductor device analysis and simulation, we reveal that the main current compositions of thick perovskite X-ray detectors are the thermionic-emission current (J_T) and the generation-recombination current (J_g-r). The typical observed failures of p-n junctions in thick detectors are caused by the high generation-recombination current due to the band mismatch and interface defects. This work provides a deep insight into the design of high sensitivity and low dark current perovskite X-ray detectors.

SUBMITTER: Zhao S

PROVIDER: S-EPMC9756221 | biostudies-literature | 2022 Oct

REPOSITORIES: biostudies-literature

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Dark current modeling of thick perovskite X-ray detectors.

Zhao Shan S Du Xinyuan X Pang Jincong J Wu Haodi H Song Zihao Z Zheng Zhiping Z Xu Ling L Tang Jiang J Niu Guangda G

Frontiers of optoelectronics 20221031 1

Metal halide perovskites (MHPs) have demonstrated excellent performances in detection of X-rays and gamma-rays. Most studies focus on improving the sensitivity of single-pixel MHP detectors. However, little work pays attention to the dark current, which is crucial for the back-end circuit integration. Herein, the requirement of dark current is quantitatively evaluated as low as 10-9 A/cm2 for X-ray imagers integrated on pixel circuits. Moreover, through the semiconductor de ...[more]

PMID: 36637550

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