Metal-Free Halide Perovskite Single Crystals with Very Long Charge Lifetimes for Efficient X-ray Imaging

Metal-Free Halide Perovskite Single Crystals with Very Long Charge Lifetimes for Efficient X-ray Imaging

© 2020 Wiley-VCH GmbH.

Bibliographische Detailangaben
Veröffentlicht in:Advanced materials (Deerfield Beach, Fla.). - 1998. - 32(2020), 42 vom: 07. Okt., Seite e2003353
1. Verfasser: Song, Xin (VerfasserIn)
Weitere Verfasser: Cui, Qingyue, Liu, Yucheng, Xu, Zhuo, Cohen, Hagai, Ma, Chuang, Fan, Yuanyuan, Zhang, Yunxia, Ye, Haochen, Peng, Zhanhui, Li, Ruipeng, Chen, Yonghua, Wang, Jianpu, Sun, Huaming, Yang, Zhou, Liu, Zhike, Yang, Zupei, Huang, Wei, Hodes, Gary, Liu, Shengzhong Frank, Zhao, Kui
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2020
Zugriff auf das übergeordnete Werk:Advanced materials (Deerfield Beach, Fla.)
Schlagworte:Journal Article X-ray detectors long carrier-diffusion length metal-free perovskites
Beschreibung
Zusammenfassung:© 2020 Wiley-VCH GmbH.
Metal-free halide perovskites, as a specific category of the perovskite family, have recently emerged as novel semiconductors for organic ferroelectrics and promise the wide chemical diversity of the ABX3 perovskite structure with mechanical flexibility, light weight, and eco-friendly processing. However, after the initial discovery 17 years ago, there has been no experimental information about their charge transport properties and only one brief mention of their optoelectronic properties. Here, growth of large single crystals of metal-free halide perovskite DABCO-NH4 Br3 (DABCO = N-N'-diazabicyclo[2.2.2]octonium) is reported together with characterization of their instrinsic optical and electronic properties and demonstration, of metal-free halide perovskite optoelectronics. The results reveal that the crystals have an unusually large semigap of ≈16 eV and a specific band nature with the valence band maximum and the conduction band minimum mainly dominated by the halide and DABCO2+ , respectively. The unusually large semigap rationalizes extremely long lifetimes approaching the millisecond regime, leading to very high charge diffusion lengths (tens of μm). The crystals also exhibit high X-ray attenuation as well as being lightweight. All these properties translate to high-performance X-ray imaging with sensitivity up to 173 μC Gyair -1 cm-2 . This makes metal-free perovskites novel candidates for the next generation of optoelectronics
Beschreibung:Date Revised 20.10.2020
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1521-4095
DOI:10.1002/adma.202003353