Research Institute for Electronic Science, Hokkaido University


LAST UPDATE 2019/06/05

  • 研究者氏名
    Researcher Name

    メルバート・ジェーム Melbert JEEM
    助教 Assistant Professor
  • 所属
    Professional Affiliation

    Research Institute for Electronic Science, Hokkaido University

    Laboratory of Nanostructured Functional Materials
  • 研究キーワード
    Research Keywords

    Optical semiconductor
    Condensed matter physics
    Transmission electron microscopy
Research Subject
Design of semiconductor optoelectronic devices based on submerged photosynthesis method

研究の背景 Background


Photosynthesis is a well-known fundamental process in green plants, which include water decomposition reaction. An artificial photosynthesis process for materials fabrication is a promising green technology, especially for its application in optoelectrical devices making. Toward this objective, it is necessary to investigate the real phenomena of photochemical reaction by conducting light physical properties evaluation in atomic level and electrochemical measurement. Achieving this objective will allow a better understanding in light-induced process for nanomaterials fabrication.

研究の目標 Outcome


Submerged photosynthesis of crystallites (SPSC) is a facile method to fabricate ZnO nanorods with apical growth characteristic. This is due to light effect, which also can be observed in SPSC utilization towards different semiconductor nanocrystals. In order to study the light effect phenomena, the light physical properties are studied by analyzing complex dielectric function obtained from electron energy-loss spectroscopy (EELS) method in latest aberration corrected transmission electron microscope.

研究図Research Figure

Fig.1. Blue-shift in photoluminescence spectra of ZnO nanorods transformed from pencil-like to flat-tip shape.

Fig.2. Optoelectrical hotspot at the tip of ZnO nanorod due to oxygen vacancy. Increased energy absorption at the tip allows an apical growth characteristic.

Fig.3. Density functional theory calculation of ZnO structure.

文献 / Publications

Sci. Rep., 5 (2015) 11429.

Nano Lett., 17 (2017) 2088-2093.