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Sensitive and Fast Direct Conversion X‐Ray Detectors Based on Single‐Crystalline HgI2 Photoconductor and ZnO Nanowire Vacuum Diode
Advanced Materials Technologies ( IF 6.4 ) Pub Date : 2020-02-24 , DOI: 10.1002/admt.201901108 Zhipeng Zhang 1 , Zhaojun Zhang 2 , Wei Zheng 2 , Kai Wang 1 , Huanjun Chen 1 , Shaozhi Deng 1 , Feng Huang 2 , Jun Chen 1
Advanced Materials Technologies ( IF 6.4 ) Pub Date : 2020-02-24 , DOI: 10.1002/admt.201901108 Zhipeng Zhang 1 , Zhaojun Zhang 2 , Wei Zheng 2 , Kai Wang 1 , Huanjun Chen 1 , Shaozhi Deng 1 , Feng Huang 2 , Jun Chen 1
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Photoconductive cold cathode X‐ray detectors are highly promising for use in medical diagnosis, industrial inspection, and scientific research applications. However, development of highly sensitive, fast, and stable direct conversion X‐ray detectors remains very challenging because of structural and material limitations. This article presents a direct conversion X‐ray detector based on a HgI2 crystal and a ZnO nanowire vacuum diode with sensitivity of 6.8 × 103 µCGyair−1 cm−2, which is nearly two orders of magnitude higher than that of a commercial a‐Se X‐ray detector. The X‐ray detector, which uses a high‐crystallization HgI2 photoconductor, shows a response time of 0.24 ms, thus significantly outperforming the polycrystalline HgI2 X‐ray detector. In addition, the current limitation between the HgI2 photoconductor and the ZnO nanowire cold cathodes guaranteed device reliability under high applied electric fields for practical applications. The findings presented in this work demonstrate that the proposed X‐ray detector based on the HgI2 photoconductor and the ZnO nanowire vacuum diode is highly efficient and stable.
中文翻译：
基于单晶HgI2光电导体和ZnO纳米线真空二极管的灵敏，快速直接转换X射线探测器
光电导冷阴极X射线探测器在医学诊断，工业检查和科学研究应用中非常有前途。但是，由于结构和材料的限制，开发高灵敏度，快速和稳定的直接转换X射线探测器仍然非常具有挑战性。本文介绍了一种基于HgI 2晶体和ZnO纳米线真空二极管的直接转换X射线探测器，其灵敏度为6.8×10 3 µCGy air -1 cm -2，比商用探测器高近两个数量级。 a-Se X射线探测器。使用高结晶HgI 2的X射线探测器光电导体显示0.24 ms的响应时间，因此大大优于多晶HgI 2 X射线检测器。另外，HgI 2光电导体和ZnO纳米线冷阴极之间的电流限制确保了在实际应用中高电场下器件的可靠性。这项工作中提出的发现表明，基于HgI 2光电导体和ZnO纳米线真空二极管的X射线探测器是高效且稳定的。
更新日期：2020-02-24
中文翻译：
基于单晶HgI2光电导体和ZnO纳米线真空二极管的灵敏，快速直接转换X射线探测器
光电导冷阴极X射线探测器在医学诊断，工业检查和科学研究应用中非常有前途。但是，由于结构和材料的限制，开发高灵敏度，快速和稳定的直接转换X射线探测器仍然非常具有挑战性。本文介绍了一种基于HgI 2晶体和ZnO纳米线真空二极管的直接转换X射线探测器，其灵敏度为6.8×10 3 µCGy air -1 cm -2，比商用探测器高近两个数量级。 a-Se X射线探测器。使用高结晶HgI 2的X射线探测器光电导体显示0.24 ms的响应时间，因此大大优于多晶HgI 2 X射线检测器。另外，HgI 2光电导体和ZnO纳米线冷阴极之间的电流限制确保了在实际应用中高电场下器件的可靠性。这项工作中提出的发现表明，基于HgI 2光电导体和ZnO纳米线真空二极管的X射线探测器是高效且稳定的。
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