Lead-free halide double perovskite-polymer composites for flexible X-ray imaging

Haoran Li, Xin Shan, Jennifer N. Neu, Thomas Geske, Melissa Davis, Pengsu Mao, Kai Xiao, Theo Siegrist, Zhibin Yu

Research output: Contribution to journalArticlepeer-review

106 Scopus citations

Abstract

X-ray detectors are demonstrated using composite films of lead-free Cs2AgBiBr6 halide double perovskite embedded in a polymer matrix as the X-ray photoconductors. Polymers with hydroxyl functional groups greatly improve the uniformity of the composite films, and large area dense films are obtained using a simple drop-casting process. X-ray detectors based on the composite films exhibit a sensitivity of 40 μC Gyair -1 cm-2, comparable to the reported sensitivity using Cs2AgBiBr6 single crystals. Such detectors can also tolerate a 5% tensile/compressive strain in the composite films without performance degradation. Pixelated X-ray detectors fabricated on the same composite film can realize X-ray imaging and resolve a proof-of-concept geometric pattern.

Original languageEnglish
Pages (from-to)11961-11967
Number of pages7
JournalJournal of Materials Chemistry C
Volume6
Issue number44
DOIs
StatePublished - 2018

Funding

This work is financially supported by Air Force Office of Scientific Research under Award FA9550-16-1-0124. We thank Dr. Junqiang Li for technical assistance on the X-ray detection measurements. JN and TS acknowledge support by the National Science Foundation under grant NSF DMR 1606952. Part of the work was carried out at the National High Magnetic Field Laboratory, which is supported by the National Science Foundation under grant NSF DMR 1644779, and the State of Florida. The portion of optical characterization was conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility.

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