ARI-SA: Infrared Studies of CdMgTe as the Material of Choice for Room Temperature Gamma-Ray Detectors

ARI-SA：CdMgTe 作为室温伽马射线探测器首选材料的红外研究

• 批准号: 0736133
• 负责人: Jiufeng Tu
• 金额: $ 10.95万
• 依托单位: CUNY City College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-01 至 2008-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0736133&HistoricalAwards=false
• 关键词: ARI; SA; Infrared; Studies; CdMgTe

0736133TuThe capability of rapid detection and identification of nuclear isotopes is urgently needed to protect our nation from nuclear terrorism. A research team from the City College of New York, Optical Semiconductors, Inc. and Brookhaven National Laboratories will combine efforts in spectroscopic characterization, material growth, and device manufacturing/testing to improve CdMgTe as the material of choice for room temperature gamma-ray detectors. CdTe-based detectors have the potential of high efficiency and high spectral resolution at room temperature. Ge or Si detectors need cryogenic temperatures for operation and their stopping power is low. Mercury iodide detectors have high stopping power, but have many mechanical, and growth problems. Cadmium zinc telluride (CZT) has recently become prominent, but it has low yield and slow growth rate. Cadmium magnedium telluride (CMT) has many advantages in comparison: (i) it has a much smaller lattice mismatch for alloying and therefore better mechanical properties; (ii) it has higher bandgap and hence high resistivity at ambient temperature; (iii) it should lead to easier fabrication of p-i-n device structure.

0736133 Tu快速探测和鉴定核同位素的能力是保护我国免受核恐怖主义的迫切需要。 来自纽约城市学院的一个研究小组，光学半导体公司。和布鲁克海文国家实验室将联合收割机在光谱表征、材料生长和器件制造/测试方面的努力相结合，以改进CdMgTe作为室温伽马射线探测器的首选材料。 CdTe基探测器具有室温下高效率和高光谱分辨率的潜力。 Ge或Si探测器需要低温操作，并且它们的阻止能力低。 碘化汞探测器具有很高的阻止能力，但有许多机械和生长问题。 碲锌镉（CZT）是近年来发展起来的一种新型材料，但产量低，生长速度慢。 相比之下，碲化镉镁（CMT）具有许多优点：（i）它具有小得多的合金化晶格失配，因此具有更好的机械性能;（ii）它具有更高的带隙，因此在环境温度下具有高电阻率;（iii）它应该导致更容易制造p-i-n器件结构。