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首页> 外文期刊>Crystal growth & design >Controlling the Vapor Transport Crystal Growth of Hg3Se2I2 Hard Radiation Detector Using Organic Polymer
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Controlling the Vapor Transport Crystal Growth of Hg3Se2I2 Hard Radiation Detector Using Organic Polymer

机译：使用有机聚合物控制Hg3Se2i2硬辐射检测器的蒸汽运输晶体生长

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摘要

The chalcohalide compound Hg3Se2I2 with a defect anti-perovskite structure has been demonstrated to be a promising semiconductor for room temperature X- and gamma-ray detection. In this work, we use transport agents during the vapor growth of Hg3Se2I2 crystals under gradient temperature profiles to dramatically improve the size and yield of Hg3Se2I2 single crystals. Various growth conditions with combinations of organic polymer (polyethylene) with elemental Hg, Se, or 12 are compared. The largest single crystals (with size up to 7 x 5 x 3.5 mm(3)) were obtained using both polyethylene and excess I-2 as the transport agents. The as-prepared detector devices based on these crystals have excellent photo response to a series of radiation sources, including low flux X-ray source, alpha particles, and gamma-rays. The X-ray induced photocurrent of Hg3Se2I2 detectors is 3 orders of magnitude higher than the dark current, indicating excellent X-ray photosensitivity. Under Am-241 alpha particle source (5.5 MeV), the best energy resolution obtained is similar to 8.1%. The Hg3Se2I2 device also shows improved detector performance under Co-57 and Cs-137 gamma-ray sources. The improved crystal growth and detector performance using this polymer additive during the vapor transport process further confirms the great potential for the development of Hg3Se2I2 for radiation detection.
机译：已经证明了具有缺陷抗钙钛矿结构的Chalcohalide化合物Hg3Se 2 I2是室温X-和γ射线检测的有前途半导体。在这项工作中，我们在梯度温度曲线下的Hg3Se 2 I2晶体的蒸汽生长过程中使用转运剂，从而显着提高Hg3Se2i2单晶的尺寸和产率。比较具有有机聚合物（聚乙烯）组合具有元素Hg，Se或12的各种生长条件。使用聚乙烯和过量的I-2作为转运剂，获得最大单晶（尺寸高达7×5×3.5mm（3））。基于这些晶体的AS制备的检测器装置对一系列辐射源具有优异的照片响应，包括低通量X射线源，α颗粒和伽马射线。 HG3Se2i2检测器的X射线诱导的光电流比暗电流高3个数量级，表明优异的X射线光敏性。在AM-241α粒子源（5.5meV）下，获得的最佳能量分辨率类似于8.1％。 HG3Se2I2器件还显示了CO-57和CS-137伽马射源下的改进的检测器性能。在蒸汽转运过程中使用该聚合物添加剂的改善的晶体生长和检测器性能进一步证实了用于辐射检测的HG3Se2i2的巨大潜力。

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