ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
34.27
Showing 1-13 articles out of 13 articles from the selected issue
  • Type: Cover
    Pages Cover1-
    Published: July 12, 2010
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Type: Index
    Pages Toc1-
    Published: July 12, 2010
    Released: September 21, 2017
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  • Tsuyoshi HIRAKAWA, Reiji HATTORI, Hiroshi ISHINISHI, Akihiro WATANABE, ...
    Type: Article
    Session ID: EID2010-1/OME2010-36
    Published: July 12, 2010
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    One of the methods to differentiate an electronic paper (e-Paper) display from a liquid crystal display (LCD) is to make the shape of e-Paper literally thin, light and flexible just like a paper. In order to achieve this, we propose the system where a battery is eliminated and the wireless power transfer is applied instead. To show the usefulness of this system, we fabricated a trial device where the commercially available wireless power supply module was embedded and the wireless data transfer was carried out. This can be used as a "Print-Anywhere" device which allows us to output the information on the e-Paper wherever we want if there is a power/data transfer point module. This system can be used in a wide variety of situation such as at handing out the meeting materials or at reading out the manuals.
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  • Masakazu MUROYAMA, Seiji YOKOKURA, Wataru SAITO, Daichi MIYAGAWA, Kuni ...
    Type: Article
    Session ID: EID2010-2/OME2010-37
    Published: July 12, 2010
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Photosensitive thin films were prepared by codeposition of polymerizable monomer and photoinitiator, which was patterned by UV irradiation followed by developing in an organic solvent. Formation of thin film patterns of carbazole polymer was achieved by this method. Similarly, photosensitive films were prepared by spin-coating a mixed solution of carbazole acrylate monomer and photoinitiator. Pattern formation was achieved when UV irradiation was made before the spin-coated film is completely dried to form polycrystalline thin films. However, the vapor-deposited films were superior in pattern formation and surface morphology. This technique was applied for the preparation of phosphorescent layer of an organic light emitting diode (OLED). It was found that the patterning process does not cause a harmful damage to the device characteristics, but rather improve the characteristics due to the polymerization.
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  • Kenjiro Fukuda, Kazunori Kuribara, Tsuyoshi Sekitani, Ute Zschieschang ...
    Type: Article
    Session ID: EID2010-3/OME2010-38
    Published: July 12, 2010
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We have fabricated pentacene organic thin-film transistors (TFTs) using self-assembled monolayers (SAMs) based on alkyl-phosphonic acids with five different alkyl chain lengths as the gate dielectric and investigated the relationship between the SAM chain length and the electrical performance and stability of the transistors. A SAM chain length of 14 carbon atoms provides a maximum TFT mobility of 0.7cm^2/Vs, along with an on/off current ratio greater than 10^5. According to the results of surface roughness of SAM by using X-ray reflectivity and atomic force microscopy, C14-SAM have most flat surface and the pentacene on C14-SAM have largest grain size of about 3μm. We also fabricated the large W/L organic TFTs using C14-SAM for realizing low operational voltage and large current TFTs. The On current of the fabricated TFTs showed about 1mA at 2V of operational voltage.
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  • Takeshi FUKUDA, Ryohei KOBAYASHI, Norihiko KAMATA, Ken HATANO, Akihiro ...
    Type: Article
    Session ID: EID2010-4/OME2010-39
    Published: July 12, 2010
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We reported an improved photoconductive characteristics by doping 1,1-dimethyl-2,5-bis(N,N-dimethylaminophenyl)-3,4-diphenylsilole (NMe_2-silole) into poly(dioctylfluorenyl-co-benzo-thiadiazole) (F8BT). In this report, we investigated transient absorption characteristics at 3440nm to estimate the mechanism of the improved photoconductive characteristics. By adding NMe_2-silole, the long-lived optical density change between 500 to 1000ps was increased. This result indicates the high carrier dislocation efficiency caused high device performances because the long-lived optical density change relates the amount of photo-excited carriers in an organic layer.
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  • Hideyuki MURATA, Heisuke SAKAI, Kudai KONNO
    Type: Article
    Session ID: EID2010-5/OME2010-40
    Published: July 12, 2010
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We realize a nonvolatile and rewritable memory effect in an organic field-effect transistor (OFET) structure using polymethylmethacryrate (PMMA) dispersed with 10-methyl-9-phenylacridinium perchlorate (MPA^+ClO4^-) as a gate dielectric. Applying a voltage between a top source-drain electrode and a bottom gate electrode induces electrophoresis of two ions of MPA^+ and ClO_4^- -towards the corresponding electrodes in the memory devices. The drain currents of the memory devicesmarkedly increase from 10^<-9>A to 10^<-2>A under no gate voltage condition due to the strong space charge polarization effect. Our memory devices have excellent electrical bistability and retention characteristics, i.e. the memory on/off ratio reached 10^7 and the drain current maintained 40% of the initial value after 10^4s.
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  • Tomoyuki Yokota, Yoshiaki Noguchi, Tsuyoshi Sekitani, Yusaku Kato, Tak ...
    Type: Article
    Session ID: IDY2010-43
    Published: July 12, 2010
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We have fabricated organic complementary (CMOS) ring oscillator with four-micron wide silver electrodes that are directly printed on high-performance organic semiconductor films by inkjet technology with subfemtoliter accuracy. P-type pentacene and n-type hexadeca-fluoro copper phthalocyanine are used for the channel layers and formed organic CMOS ring oscillators. The inkjet system can create very fine electrodes which are one order of magnitude smaller than those from typical vacuum evaporation process. As a result, the oscillating frequency of the CMOS with printed electrodes is achieved to 2.26kHz with voltage of 40V.
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  • Ryo MIYAZAWA, Dai TAGUCHI, Takaaki MANAKA, Mitsumasa IWAMOTO
    Type: Article
    Session ID: EID2010-6/OME2010-41
    Published: July 12, 2010
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Organic devices have been attracted for its light weight, flexibility, low cost fabrication. To improve their performance, understanding for carrier injection, accumulation and transport process is needed. However, it is difficult to comprehend these processes by only using indirect methods, e.g., I-V measurement, because of ambiguity of carrier behaviors in organic materials. On the basis of back grounds, we believe that optical methods like second harmonic generation (SHG) method is useful to understand carrier behaviors in organic materials because it can directly probe carrier motion. Using C-V measurements, we have revealed that electron were trapped by photoillumination and biasing in MIS (ITO/PI/P3HT/Au), though the location of electron traps was unknown. In this study, we conducted electric field induced second harmonic generation (EFISHG) and probed the electric field formed by electron traps. We showed the presence of electron traps in PI layers.
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  • Ryota KOHNO, Yuta NASUKAWA, Yasufumi IIMURA
    Type: Article
    Session ID: EID2010-7/OME2010-42
    Published: July 12, 2010
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Realization of flexible LCDs, which essentially use plastic substrates, is one of research targets for future LCD productions. Using plastic substrates, however, would lead conventional LCD fabrication processes to change due to their low heat resistant, etc. In this study, we mainly present the results of polymer-surface-stabilized processes for stabilizing LC alignment in flexible LCDs.
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  • Type: Appendix
    Pages App1-
    Published: July 12, 2010
    Released: September 21, 2017
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  • Type: Appendix
    Pages App2-
    Published: July 12, 2010
    Released: September 21, 2017
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  • Type: Appendix
    Pages App3-
    Published: July 12, 2010
    Released: September 21, 2017
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