Textured α-HgI₂ ceramics for sensitive X-ray detection

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• 作者：Mathieu Rault^a ; ^b ; Laurent Binet^a ; ^{laurent.binet@chimie-paristech.fr" class="auth_mail" title="E-mail the corresponding author} ; Didier Gourier^a ; Gilles Wallez^a ; ^c ; Jean-Pierre Ponpon^d ; ¹ ; Dominique Biava^b ; Jean-Marc Inglese^b ; Philippe Barboux^a
• 关键词：Mercury diodide ; X-ray detector ; Ceramic
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2016
• 出版时间：1 February 2016
• 年：2016
• 卷：808
• 期：Complete
• 页码：35-40
• 全文大小：685 K

文摘

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$\approx 3\times {10}^{-5}$ 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.