Low Dimensional, Metal-Free, Hydrazinium Halide Perovskite-Related Single Crystals and Their Use as X-Ray Detectors

Xin Song, Hagai Cohen, Jun Yin, Haojin Li, Jiayi Wang, Youyou Yuan, Renwu Huang, Qingyue Cui, Chuang Ma, Shengzhong Liu, Gary Hodes*, Kui Zhao*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Metal-free halide perovskites (MFHaPs) have garnered significant attention in recent years due to their desirable properties, such as low toxicity, light weight, chemical versatility, and potential for optoelectronics. MFHaPs with the formula A2+B+X−3 (where A is a large organic divalent cation, B+ is typically NH4+, and X is a halide) have been studied extensively, but few studies have examined alternative cations at the B position. This paper reports the synthesis of three MFHaP-related single crystals, DABCO-N2H5-X3 (DABCO = N-N-diazabicyclo[2.2.2]octonium, X = Br and I) and (DABCO)3-N2H5(NH4)2Cl9, which feature hydrazinium (N2H5) at the B position. The crystals have a perovskite-like, one-dimensional, edge-connected structure and exhibit optical and band structure properties. The crystals were then tested as X-ray detectors, where they showed excellent photoresponsivity, stability, and low background noise, owing to the large semi-gap that dictates long lifetimes. The detectors exhibited sensitivity as high as 1143 ± 10 µC Gyair−1 cm−2 and a low detection limit of 2.68 µGy s−1 at 10 V. The researchers suggest that the stronger hydrogen bonding in N2H5+ compounds compared to NH4+ MFHaPs may contribute to the detectors’ enhanced stability.

Original languageEnglish (US)
Article number2300892
JournalSmall
Volume19
Issue number30
DOIs
StatePublished - Jul 26 2023

Keywords

  • high voltage detectors
  • metal-free perovskite
  • single crystals
  • X-ray detectors

ASJC Scopus subject areas

  • Biotechnology
  • General Chemistry
  • Biomaterials
  • General Materials Science
  • Engineering (miscellaneous)

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