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CURRENT-VOLTAGE PROPERTIES OF SCHOTTKY CONTACT FORMED BY COPPER LAYER DEPOSITED ON ION-IMPLANTED P-TYPE DIAMONDS
Get PDFWe have formed a Schottky contact on p-type diamond substrates doped only by boron ion implantation process. The doping concertation in the drift layer was 4×10^18 cm^-3 and that beneath the Ohmic contact layer was about 1×10^21 cm^-3 in order to reduce the contact resistance at the Ohmic contact. We investigate the rectifying properties for the Schottky electrode fabricated by copper layer. The observed current between two Ohmic electrodes linearly depended on the applied voltage. From the I-V characteristics between the Ohmic and Schottky contacts, the rectification behavior was not clearly observed for the case of copper electrode, and rectification ratio, which is the current ratio of forward direction to reverse direction, was considerably low
Individual shape and composition analysis of urban atmospheric aerosols using FIB-TOF-SIMS
Get PDFMinute solid or liquid particles suspended in air are called aerosols. Aerosols can be of natural origin, such as yellow sand, or of anthropogenic origin, such as railroad wear dust. Bulk analysis has been used for the chemical analysis of aerosols with such various sources. However, bulk analysis can only determine the average chemical composition of a group of particles and cannot, in principle, analyze the chemical composition of individual particles. In our group, we have developed an FIB-TOF-SIMS (Focused Ion Beam Time-of-Flight Secondary Ion Mass Spectrometer) to analyze the compositional distribution of individual particles . Our investigations have revealed that there is a certain correlation between particle composition (source) and particle shape. In addition, it is important to understand the composition and shape of particles originating from urban areas because the traffic volume is relatively high in urban areas and there is concern about the emission of large amounts of aerosols and their health effects on human health. In this study, we sampled aerosols in Shinjuku area and analyzed them using FIB-TOF-SIMS. In this presentation, we will report the component analysis of urban atmospheric aerosols and the shape characteristics of the particles
The Theory and Practice of Residential District Planning after the Establishment of People\u27s Republic of China
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Special Issue : Unemployment Relief Programs in Postwar Japan : An Historical Reevaluation of the Programs and Workers Covered by Them : Introduction to the Special Issue
Get PDFSpecial Issue : Unemployment Relief Programs in Postwar Japan : An Historical Reevaluation of the Programs and Workers Covered by Them : Postwar Unemployment Countermeasures, Labor and Buraku Problem
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<Book Reviews> MIYAJIMA Takashi, Toward an Integrated Multicultural Society Japan and Europe, Reexamining the Politics of Immigration
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