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Impact ionization [1,2], or electron-hole pair creation by charged particles, has been one of the central issues of semiconductor physics and devices. However, due to its complexity of the process, most experimental studies and their analyses have been macroscopic and phenomenological. This situation prevents us from exploring the fundamental physics of impact ionization and of high-energy charged...
The assembled domain structure model (ADSM) taking account of the distribution of pinning sites is proposed. To apply to the ADSM, the mesoscopic pinning field is formulated from the microscopic distribution. The magnetization curves and magnetization processes of the silicon steel sheet are simulated by the proposed model.
Series coupled triple quantum dots (TQDs) have been studied as an important element of quantum computers. It is needed to fabricate QD array connected in series with a compact structure to scale up the quantum bits. To develop quantum bits based on the TQDs, evaluation of the charge stability diagram is needed. However, since the center gate usually couples to all dots in the compact TQDs, it is difficult...
Current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) devices with Co-based Heusler alloys have recently drawn considerable attention due to their potential application as read sensors for ultrahigh density magnetic recording.1,2,3,4 With a non-magnetic Ag spacer layer, the resistance change-area product (ΔRA) of epitaxial pseudo spin valves (PSVs) on single crystalline (001) MgO substrates...
Excellent electrical properties of latest power devices for improving the efficiency of PV inverters are presented. Power modules using SiC-MOSFET and -SBD exhibit the possibility to realize PV inverters with peak efficiency beyond 99.0%. Silicon IGBT modules using RB-IGBT have enabled to mass-produce PV inverters with peak efficiency of 98.4%. Silicon SJ-MOSFET and discrete IGBT have enabled to improve...
Our team is carrying out the project of Planet observation with high precision using balloon-borne telescope. The first model, BBT-1 was equipped with a three stage pointing system and an optical system to observe the detailed structure of the atmospheric motion of Venus. The first flight test was conducted in 2009, and the performance of the system was verified. However, because of a trouble of onboard...
Silicon die stacking with low-volume interconnections is an attractive method for 3D integration. It offers such benefits as extension to fine-pitch integration, increased vertical heat transfer and hierarchy for repeated thermal processes without re-melting. The process uses low-volume solder to form joints of few microns high. The low-volume solder mostly forms intermetallic compounds with underlying...
The reliability of IGBT chip surface electrode for bonding-wires is described. The power cycling (P/C) capability of an IGBT module is improved due to a suppression of chip surface aluminum (Al) electrode degradation with Nickel (Ni) plating. The P/C capability obtained with the Ni plating electrode is about 3 times higher than that with the Al electrode at a high temperature condition. Such a good...
A metal-ferroelectrics-semiconductor (MFS) capacitor with a ferroelectric polymer as a gate dielectric has recently attracted much interest owing to its potential applications in nonvolatile memory. In order to understand switching dynamics, we performed simultaneous measurements of the charge Q and the capacitance C for Au/vinylidene fluoride- trifluoroethylene (VDF-TrFE) /n-Si structure using a...
We study the enhanced light emission from a silicon slab with a photonic crystal nanocavity. We find that phonon accumulation in the tiny space is a key for enhanced light emission in addition to the cavity effect for photons.
We demonstrate a highly functional Si-nanodot-array device that has three input gates and two output terminals. The device was fabricated on an SOI wafer using Si MOS processes. We confirmed that a single device can operate as both a half adder and a full adder when we carefully select the operation voltages.
The D-source, which ensures beam current increase in the LEX series, SEN's high current batch-type implanter, has been developed for productivity improvement or COO reduction. The D-source can achieve beam current increase dramatically only by replacing the original source. Moreover, the D-source has longer source life time with easier maintenance. Performance of the D-source was reported in this...
We propose a novel technique of "Luminoscopy" in which the deficiencies in the cells and modules can be clearly detected by photographic surveying of electroluminescence (EL) without any probing tools. Under the forward bias condition, the cell emits infrared light (lambda=1100 to 1200 nm), whose intensity reflects the number of minority carriers in p-type layer. The EL intensity distribution...
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