Journal of The Society of Photographic Science and Technology of Japan
Online ISSN : 1884-5932
Print ISSN : 0369-5662
ISSN-L : 0369-5662
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Showing 1-11 articles out of 11 articles from the selected issue
Special Topics: Ambient Technology Seminar 6
Exposition
  • Hiroaki Iino, Jun-ichi Hanna
    2019 Volume 82 Issue 1 Pages 6-9
    Published: 2019
    Released: May 26, 2020
    JOURNALS FREE ACCESS

    In semiconductor materials for printed electronics, not only high mobility but also solution processability are required. Liquid crystalline organic semiconductors have high solubility for organic solvent and controllability of molecular ori entation of films. In addition, it is easy to fabricate crystalline thin films with uniform and flat surface morphology by using uniform liquid crystalline films as their precursor. Furthermore, the liquid crystalline derivatives suitable for organic transistors are developed by molecular design for highly ordered liquid crystal phase such as smectic E (SmE) phase. In fact, Phenyl-Benzothienobenzothiophene derivative (Ph-BTBT-10) designed for the SmE phase has good thermal durability up to 200 °C, while keeping high solubility. In addition to this, Ph-BTBT-10 having monoalkyl chain can form the bilayer crystal structure, which cannot be achieved with dialkyl derivatives and often increase mobility. Therefore, liquid crystalline organic semiconductors are recognized as a potential candidate for semiconductor materials for printed electronics.

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  • Tomohito Sekine, Daisuke Kumaki, Shizuo Tokito
    2019 Volume 82 Issue 1 Pages 10-12
    Published: 2019
    Released: May 26, 2020
    JOURNALS FREE ACCESS
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  • Kazuo Yamaguchi, Takuma Igari
    2019 Volume 82 Issue 1 Pages 13-18
    Published: 2019
    Released: May 26, 2020
    JOURNALS FREE ACCESS

    Photosensitive surface modifier of silane coupling agents bearing carboxylic acid and amine protected by 2-nitrobenzyl group at the terminal was developed. Self-assembled monolayers were fabricated using these modifiers on the surface of silicon wafer and glass substrates followed by near UV irradiation with photomask to successfully obtain a patterning with a line width of 10 μm. The patterning was confirmed by staining with silver nanoparticulate and fluorescence agent. Development of photosensitive phosphonic acid derivatives as a novel surface modifying agent is also reported.

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Special Topics: Image Stability
Exposition
Exposition
  • Takeru Bessho
    2019 Volume 82 Issue 1 Pages 49-53
    Published: 2019
    Released: May 26, 2020
    JOURNALS FREE ACCESS

    Potassium-doped organometal halide perovskite solar cells (PSCs) of more than 20% power conversion efficiency (PCE) without I-V hysteresis were constructed. The crystal lattice of the organometal halide perovskite was expanded with increasing of the potassium cation (K+) ratio, where both absorption and photoluminescence spectra shifted to the longer wavelength, suggesting that the optical band gap was decreased. In the case of the perovskite with the 5% K, the conduction band minimum (CBM) became shallower to the CBM level of the Li-treated TiO2. Furthermore, intermediate grain boundaries in film was practically vanished by incorporated K . In these situation, the electron transfer barrier at the interface between Li-treated TiO2 and the perovskite and by physical gap of grain boundary were minimized. It is concluded that stagnation-less carrier transportation could minimize the I-V hysteresis of PSCs.

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  • -Establishment of X-ray Diagnostic Imaging and its Digitization-
    Shunji Takada
    2019 Volume 82 Issue 1 Pages 54-62
    Published: 2019
    Released: May 26, 2020
    JOURNALS FREE ACCESS

    Current medical care is supported by image diagnosis by PACS. Although its beginning is in the finding of X-rays, in order to establish it as a diagnostic imaging method, it was necessary to solve the X-ray scattering problem by the human body. The next tasks were high sensitivity for reduction of exposure dose, rapid processing for immediacy, high image quality for improving diagnostic performance, but they were solved with screen and film improvements. Digitization is on an extension of these tasks, resulting in image acquisition by CR and DR and image display by dry imager and by flat-panel display.

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