Study of impurity states in II-VI semiconductor particles by local photon-emission spectroscopy

利用局域光子发射光谱研究 II-VI 族半导体颗粒中的杂质态

基本信息

批准号：
06640449
负责人：
NISHITANI Ryusuke
金额：
$ 1.34万
依托单位：
Kyushu Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06640449/
关键词：
STM photon emission scanning tunneling microscope local electronic structure fine particle surface plasmon nanoscale digital control 局所電子状態スペクトロスコピー II-VI族半導体プラズマスッパタリング STS

项目摘要

1.For the study of the local electronic structure of the surfaces and the microclusters, we have made a digital controlled UHV-STM which is able to record 2-dimensional map of the intensity of the photon emitted from the STM tunnel junction. An image of the photon map is recorded simultaneously with the measurements of a topography image by STM and the STS measurements. The spectral resolved photon-maps can also be obtained by using an optical band pass filter with the band width of about 50 nm and the center of the wave length of 700 and 650 nm. This apparatus is emplyed to observe the STM induced photon-maps for the film of the noble metal particles (Au and Ag) on the graphite surface. We have measured the photon images for various morphology of the film to investigate the correlation between the photon maps and the morphology of the films. We have observed that the photon map is dependent on the wave length of the collected light. We have found that the photon spectra is closely related with the geometry of the STM tip and the metal particles. The change in the spectral resolved photon map is explained in terms of the effect of the curvature radius of the STM tip on the photon spectra.2.We have studied the optical properties of the CdS microclustes. The microclustes of CdS microclusters in various sizes ranging from 1 to 2nm are prepared by precipitation technique.We have observed the size-dependnet absorption spectra for the CdS microclusters. The absorption edge for the CdS clusters increases in energy with the decrease in the cluster size. This observation is explained by the quantum size effect on the electronic levels of CdS microclustes.

1.在研究表面和微量群体的局部电子结构时，我们制作了一个数字控制的UHV-STM，该数字控制能够记录从STM隧道连接处发出的光子强度的二维图。通过STM和STS测量值同时记录光子图的图像。光谱分辨的光子映射也可以通过使用带有约50 nm的带宽和波长为700和650 nm的波带宽度的光带滤波器获得。该设备被弹出，以观察石墨表面上贵金属颗粒（AU和Ag）膜的STM诱导的光子图。我们已经测量了膜的各种形态的光子图像，以研究光子图与膜的形态之间的相关性。我们已经观察到光子图取决于收集光的波长。我们发现，光子光谱与STM尖端和金属颗粒的几何形状密切相关。光谱分辨光子图的变化是根据STM尖端对光子光谱的曲率半径的影响来解释的。2。我们研究了CDS微量固定的光学特性。通过降水技术制备各种尺寸的CDS微簇的微量升压，我们观察到CDS微量群体的尺寸依赖性网络吸收光谱。 CDS簇的吸收边缘随着簇尺寸的减小而增加能量。该观察结果是通过量子大小对CD微量过滤的电子水平的影响来解释的。