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Title: Optical and Electronic Anisotropies in Perovskitoid Crystals of Cs3Bi2I9 Studies of Nuclear Radiation Detection

Journal Article · · Journal of Materials Chemistry. A
DOI:https://doi.org/10.1039/c8ta09525f· OSTI ID:1490335
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [3];  [3];  [3];  [3];  [1];  [1]; ORCiD logo [4]
  1. State Key Laboratory of Solidification Processing, Xi'an (China); Northwestern Polytechnical Univ., Xi'an (China)
  2. State Key Laboratory of Solidification Processing, Xi'an (China); Northwestern Polytechnical Univ., Xi'an (China); Northwestern Univ., Evanston, IL (United States)
  3. Northwestern Polytechnical Univ., Xi'an (China)
  4. 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 Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
Fundamental Research Funds for the Central Universities; National Natural Science Foundation of China (NSFC); National Key Research and Development Program of China; US Department of Homeland Security (DHS); USDOE
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1490335
Journal Information:
Journal of Materials Chemistry. A, Vol. 6, Issue 46; ISSN 2050-7488
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 68 works
Citation information provided by
Web of Science

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Cited By (6)

Enhanced On–Off Ratio Photodetectors Based on Lead‐Free Cs 3 Bi 2 I 9 Single Crystal Thin Films journal February 2020
From Pb to Bi: A Promising Family of Pb‐Free Optoelectronic Materials and Devices journal April 2020
Lead‐Free Metal Halide Perovskite Nanocrystals: Challenges, Applications, and Future Aspects journal January 2019
Solution‐Grown Hypervalent CsI 3 Crystal for High‐Sensitive X‐Ray Detection journal September 2019
Highly sensitive X-ray detector made of layered perovskite-like (NH4)3Bi2I9 single crystal with anisotropic response journal June 2019
Solution‐Grown Hypervalent CsI 3 Crystal for High‐Sensitive X‐Ray Detection journal August 2019

Figures / Tables (11)


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