Study of perovskite CsPbBr3 detector polarization and its mitigation with ultrahigh x-ray flux

Pan, Lei; Pandey, Indra Raj; Liu, Zhifu; Peters, John A.; Chung, Duck Young; Hansson, Conny; Wessels, Bruce W.; Miceli, Antonino; Kanatzidis, Mercouri G.

doi:10.1063/5.0151902

Title: Study of perovskite CsPbBr₃ detector polarization and its mitigation with ultrahigh x-ray flux

Journal Article · 15 May 2023 · Journal of Applied Physics

DOI: https://doi.org/10.1063/5.0151902 · OSTI ID:1996574

^[1]; Pandey, Indra Raj ^[2];

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^[4]; Hansson, Conny ^[5];

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Northwestern Univ., Evanston, IL (United States)
Northwestern Univ., Evanston, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
Northwestern Univ., Evanston, IL (United States); Chicago State Univ., IL (United States)
Argonne National Laboratory (ANL), Argonne, IL (United States)
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

High-flux capable semiconductor x-ray detectors are essential in various applications, but the detrimental effects of detector polarization limit their use in many cases. Here, for this work, we studied the polarization of perovskite CsPbBr₃ semiconductor detectors using ultrahigh flux synchrotron x rays (10⁶–10¹² photons s^–1 mm^–2 at 58.61 keV). The CsPbBr₃ detectors did not show immediate polarization prominently until a flux higher than 10¹⁰ photons s^–1 mm^–2. Using the pump-and-probe technique, we visualized the spatial and temporal effects of polarization. The polarized region, represented by reduced photocurrent, extended beyond the area under direct irradiation, and the reduced photocurrent persisted after potential de-polarization treatments. We found that stronger applied electric fields and fewer carrier traps can mitigate polarization, represented by less photocurrent deficit. By examining the detectors’ current response under controlled ambient light, low, and high-flux x rays, we studied the trap filling and release behavior of CsPbBr₃. We discovered that the polarization is caused by partial detector damage due to deep defects generated by ultrahigh flux x-ray irradiation. Our work provides insight into CsPbBr₃ polarization under extremely intense x-ray radiation and shows that reducing crystal defects and increasing detector bias voltage are effective solutions.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Defense Advanced Research Projects Agency (DARPA); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC02-76SF00515; AC02-06CH11357; HDTRA1-20-2-0002

OSTI ID:: 1996574

Alternate ID(s):: OSTI ID: 2340749

Journal Information:: Journal of Applied Physics, Vol. 133, Issue 19; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Electric currents
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Title: Study of perovskite CsPbBr3 detector polarization and its mitigation with ultrahigh x-ray flux

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References (29)

Figures / Tables (6)

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Title: Study of perovskite CsPbBr₃ detector polarization and its mitigation with ultrahigh x-ray flux