Zero-Dimensional Cs2TeI6 Perovskite

Solution-Processed Thick Films with High X-ray Sensitivity

Yadong Xu, Bo Jiao, Tze Bin Song, Constantinos C. Stoumpos, Yihui He, Ido Hadar, Wenwen Lin, Wanqi Jie, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We demonstrate a potential candidate, the 0D "all-inorganic" perovskite material Cs2TeI6, as a sensitive all-inorganic X-ray photoconductor for the development of the new generation of direct photon-to-current conversion flat-panel X-ray imagers. Cs2TeI6 consists of high atomic number elements, has high electrical resistance, and exhibits high air and moisture stability, making it suitable as a sensitive X-ray photoconductor. In addition, we identify that Cs2TeI6 film can be prepared under a low-temperature process using electrostatic-assisted spray technique under atmospheric conditions and achieved resistivity of 4.2 × 1010 ω·cm. The resulting air- and water-stable Cs2TeI6 device exhibits a strong photoresponse to X-ray radiation. An electron drift length on the order of 200 μm is estimated under an applied electrical field strength of 400 V·cm-1. A high sensitivity for Cs2TeI6 thick film device is realized, with the value of 192 nC·R-1cm-2 under 40 kVp X-rays at an electrical field of 250 V·cm-1, which is ∼20 times higher than that of the hybrid 3D perovskite polycrystalline film X-ray detectors. X-ray imaging based on Cs2TeI6 perovskite films will require lower radiation doses in many medical and security check applications.

Original languageEnglish
Pages (from-to)196-203
Number of pages8
JournalACS Photonics
Volume6
Issue number1
DOIs
Publication statusPublished - Jan 16 2019

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Thick films
Perovskite
thick films
X-Rays
X rays
Photoconducting materials
x rays
photoconductors
Thick film devices
X ray films
Air
Acoustic impedance
Equipment and Supplies
X-Ray Film
inorganic materials
Image sensors
air
Dosimetry
radiation
meteorology

Keywords

  • CsTeI
  • electrostatic spray
  • hard radiation
  • perovskite
  • sensitivity
  • thick film

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biotechnology
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

Cite this

Zero-Dimensional Cs2TeI6 Perovskite : Solution-Processed Thick Films with High X-ray Sensitivity. / Xu, Yadong; Jiao, Bo; Song, Tze Bin; Stoumpos, Constantinos C.; He, Yihui; Hadar, Ido; Lin, Wenwen; Jie, Wanqi; Kanatzidis, Mercouri G.

In: ACS Photonics, Vol. 6, No. 1, 16.01.2019, p. 196-203.

Research output: Contribution to journalArticle

Xu, Yadong ; Jiao, Bo ; Song, Tze Bin ; Stoumpos, Constantinos C. ; He, Yihui ; Hadar, Ido ; Lin, Wenwen ; Jie, Wanqi ; Kanatzidis, Mercouri G. / Zero-Dimensional Cs2TeI6 Perovskite : Solution-Processed Thick Films with High X-ray Sensitivity. In: ACS Photonics. 2019 ; Vol. 6, No. 1. pp. 196-203.
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