Previous Issue

Volume 42 Number 2 (2011.6)

Special Feature

Electronic and Optical Devices

Part I. Special Feature


Research Reports

  • 2. A Vertical Insulated Gate AlGaN/GaN Heterojunction Field-effect TransistorPDF(685kB)

    pages 1-4
    Masakazu Kanechika, Masahiro Sugimoto, Narumasa Soejima, Hiroyuki Ueda, Osamu Ishiguro, Masahito Kodama, Eiko Ishii, Kenji Itoh, Tsutomu Uesugi and Tetsu Kachi

    We fabricated a vertical insulated gate AlGaN/GaN heterojunction field-effect transistor, using a GaN substrate. This transistor exhibited a specific on resistance of as low as 2.6 mΩ· cm2 with a threshold voltage of -16 V.

  • 3. High-accuracy Temperature Prediction for an HV Inverter Using Electro-thermal Coupling SimulationPDF(1,699kB)

    pages 5-12
    Takashi Kojima, Yuji Nishibe, Yasushi Yamada and Kaoru Torii

    The present paper describes a novel RC compact thermal model capable of representing the thermal behavior of a multi-chip inverter module designed for use in hybrid vehicles (HVs). Electro-thermal coupling simulation using this model offers sufficient accuracy for the prediction of the chip temperature in accordance with actual HV running.

  • 4. Organic Field-effect Transistors Based on Graphene Fragments: Hexa-peri-hexabenzocoronenesPDF(1,523kB)

    pages 13-20
    Tomohiko Mori, Hisato Takeuchi, Yoshihiro Kikuzawa and Koji Noda

    Organic field-effect transistors (OFETs) based on hexabenzocoronene (HBC) derivatives have been developed. In p-type OFETs, derivatives designed to self-assemble into lamellar aggregates increased the field-effect mobilities. In n-type OFETs, a derivative with strong electron-withdrawing groups was synthesized. Changes in the drain current caused by ethanol gas were demonstrated.

  • 5. Light-induced Self-written Optical WaveguidesPDF(2,366kB)

    pages 21-32
    Manabu Kagami, Tatsuya Yamashita, Masatoshi Yonemura and Takayuki Matsui

    Light-induced self-written (LISW) technology is a unique and simple method of forming low-loss 3-dimensional optical circuits in photopolymers using radiation from an optical fiber. The technology helps simplify optical interconnections, e.g. combining of misaligned fibers as shown in the figure on the left, and it is expected that it will reduce the cost of mounting optical devices.

  • 6. Optical Amplification and Laser Oscillation Characteristics of Tb3+-doped Fluoride Glass FiberPDF(3,971kB)

    pages 33-45
    Tatsuya Yamashita and Yasutake Ohishi

    The laser transition of Tb3+ doped in fluoride glass was analyzed and their performance as gain media in the 0.54 μm band was clarified. The continuous-wave laser operation at 542.8 nm has been successfully demonstrated using Tb3+-doped fluoride fiber for the first time.

Part II. Highlighted Papers

Research Reports

  • 7. Enhanced Visible-light Photocatalysis over N-doped TiO2 by Loading with Fe, Cu, or Pt CocatalystsPDF(969kB)

    pages 47-53
    Takeshi Morikawa, Ken-ichi Suzuki, Hideyuki Masaki, Tadayoshi Ito, Kousuke Kitazumi, Naoko Takahashi, Koyu Aoki, Ryoji Asahi and Takeshi Ohwaki

    The rates of visible-light-induced photocatalytic oxidation of gaseous formic acid, acetic acid, acetaldehyde, and toluene over N-doped TiO2 (N-TiO2) were enhanced by surface-loading with Fe, Cu, or Pt.? The resulting odor-eliminating and antibacterial properties can enhance the health and comfort of human life.

  • 8. Thrust Force Analysis of Tripod Constant Velocity Joint Using Multibody ModelPDF(1,612kB)

    pages 55-64
    Hideki Sugiura, Tsugiharu Matsunaga, Yoshiteru Mizutani, Yosei Ando and Isashi Kashiwagi

    To analyze thrust force of a tripod constant velocity joint, a detailed model is constructed based on a multibody dynamics approach (Figure on the left). This model includes all principal parts and all contact and friction forces acting among these parts. The appropriateness of this model is validated by comparing computational and experimental results, and the influence of skewed needle rollers and friction forces on the thrust force is clarified.

  • 9. Synthesis of Highly Monodispersed Mesoporous Tin Oxide SpheresPDF(707kB)

    pages 65-72
    Narihito Tatsuda, Tadashi Nakamura and Kazuhisa Yano

    Highly monodispersed mesoporous tin oxide spheres (MMTOS) consisting of SnO2 nanocrystals are synthesized through a double nanocasting process using monodispersed mesoporous silica spheres as a starting host. Due to its high monodispersity, MMTOS can self-assemble into a close-packed opal that exhibits a stop band in the visible region.

  • 10. Modeling of Diesel Spray Atomization Linked with Internal Nozzle FlowPDF(1,895kB)

    pages 73-84
    Makoto Nagaoka, Reiko Ueda, Ryo Masuda, Eberhard von Berg and Reinhard Tatschl

    A computational fluid dynamics (CFD) model is enhanced to predict Diesel spray characteristics using a series calculation methodology from injector nozzle internal flow to fuel spray. The calculated spray characteristics, which are spray shape, tip penetration, angle and droplet size distributions of both mini-sac and valve covered orifice nozzles are compared with the measurement data and quantitatively reproduced.