Textured α-HgI2 ceramics for sensitive X-ray detection
Abstract
In the prospect of manufacturing ionizing radiation detectors, dense ceramics of α-HgI2 with a strong preferred orientation were elaborated. X-ray diffraction showed that most crystallites exhibited their crystal c-axis perpendicular to the ceramic plane, which should be favorable for optimum electrical transport properties. Dark current densities about 2 nA mm-2 (under 0.2 V μm-1 bias) were measured and were shown to arise mostly from the release of carriers from trap defects (Poole-Frenkel emission). The X-ray sensitivity ≈1600 nC mGy-1 cm-2 and the μτ value ≈ 3 × 10-5 cm2 V-1 were comparable to those of other forms of polycrystalline HgI2. The HgI2 ceramics also exhibited a perfectly linear response as a function of the X-ray dose.
- Publication:
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Nuclear Instruments and Methods in Physics Research A
- Pub Date:
- February 2016
- DOI:
- 10.1016/j.nima.2015.11.032
- Bibcode:
- 2016NIMPA.808...35R
- Keywords:
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- Mercury diodide;
- X-ray detector;
- Ceramic