Optical and Electronic Anisotropies in Perovskitoid Crystals of Cs3Bi2I9 Studies of Nuclear Radiation Detection
Journal Article
·
· Journal of Materials Chemistry. A
- State Key Laboratory of Solidification Processing, Xi'an (China); Northwestern Polytechnical Univ., Xi'an (China)
- State Key Laboratory of Solidification Processing, Xi'an (China); Northwestern Polytechnical Univ., Xi'an (China); Northwestern Univ., Evanston, IL (United States)
- Northwestern Polytechnical Univ., Xi'an (China)
- Northwestern Univ., Evanston, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
The halide perovskitoid compound Cs3Bi2I9 (CBI) has attracted considerable interest as a semiconductor because of its outstanding stability and reduced toxicity compared with lead-based halide perovskites. Here, we report the growth of nuclear radiation detection grade CBI bulk crystals (Φ 15 × 60 mm3) with a high resistivity of over 1010 Ω cm using a modified vertical Bridgman method. Because of their layered crystal structures we investigated the anisotropy in the optical and electrical properties using different crystal orientations. The CBI(001) sample exhibits a resistivity of ~1012 Ω cm compared to ~1010 Ω cm for the CBI(100) sample. This is due to the anisotropic mobility in the two crystallographic directions. Using 425 nm LED (~200 mW cm–2) illumination CBI(001) possesses a superior optical response with a switching ratio of over 40, which is critically higher than that of CBI(100) (<2). Detectors of 2 mm thickness show a capability of detecting 241Am@5.49 MeV α particles, with good peak discrimination. A full width at half maximum (FWHM) of 32% was obtained under a bias of 560 V. Simultaneously, the electron mobility and mobility lifetime (μτ) were calculated to be 6.10 cm2 V–1 s–1 and 2.03 × 10–5 cm V–1, respectively. First-principles density functional theory calculations confirm the crystallographic anisotropy of the carrier effective masses. Additionally, a significant X-ray sensitivity of 111.9 μC Gy–1 cm–2 for a CBI detector was observed, under 80 kVp X-rays at an electrical field of 450 V cm–1.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- Fundamental Research Funds for the Central Universities; National Key Research and Development Program of China; National Natural Science Foundation of China; U. S. Department of Homeland Security; USDOE
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1490335
- Journal Information:
- Journal of Materials Chemistry. A, Journal Name: Journal of Materials Chemistry. A Journal Issue: 46 Vol. 6; ISSN JMCAET; ISSN 2050-7488
- Publisher:
- Royal Society of ChemistryCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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