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Stabilization of a diamond cold cathode and its application to ultra high sensitive photodetector

金刚石冷阴极的稳定性及其在超高灵敏光电探测器中的应用

基本信息

批准号：
13305006
负责人：
OKANO Ken
金额：
$ 30.53万
依托单位：
International Christian University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13305006/
关键词：
electron emitter cold cathode heavily nitrogen (N-) doped CVD Diamond ultra high sensitive photodetector photodetector amorphous selenium homoepitaxial diamond heteroepitaxial diamond 電子放出撮像素子窒素添加光導電膜

项目摘要

Throughout our research we have established a. model to explain the mechanism of the electron emission from heavily nitrogen doped CVD diamonds. We have investigated on the electron emission from not only polycrystalline samples, but also homo- and hetero-epitaxial samples. By a) assessing the electric field applied onto the vacuum by measuring-the emission current when variating the distance between the anode and the cathode, and b) from the results of RHEED, Hall measurement, REELS, and Raman Spectroscopy, we have proved the adequacy of our model. Within the last period, we have compared the emission properties of surface treated and non-surface treated diamond samples.Towards our final goal of obtaining an ultra high sensitive photodetector, we have used our diamond emitter as a cold cathode and a photoconductive amorphous selenium (a-Se) as the target. As a prototype, we have fabricated a diode and triode structured photodeter and succeeded in operating this device under voltage and vacuum lower than any know conventional photodetectors. The a-Se, however experienced crysallization after hours of operation, which decreased the performance, although, a small amount of arsenic doped into the selenium film was found to prevent this phenomena.

在整个研究过程中，我们建立了一个模型来解释重氮掺杂CVD金刚石的电子发射机制。我们不仅研究了多晶样品的电子发射，而且研究了同质和异质外延样品的电子发射。通过测量阴极和阳极之间距离变化时的发射电流来评估施加在真空上的电场，以及根据RHEED、霍尔测量、卷轴和拉曼光谱的结果，我们证明了我们模型的充分性。在过去的一段时间里，我们比较了表面处理和非表面处理的金刚石样品的发射性能。为了获得超高灵敏度的光电探测器，我们使用了我们的金刚石发射体作为冷阴极，光导非晶硒(a-Se)作为靶材。作为一个原型，我们制作了一个二极管和三极管结构的光电探测器，并成功地在比任何已知的常规光电探测器更低的电压和真空下工作。然而，a-Se在运行几个小时后发生了结晶，这降低了性能，尽管在硒薄膜中发现了少量的砷掺杂来防止这种现象。