Organic Thin Film Division
The expression function of organic molecules highly depends on their chemical structure, aggregation state, and crystal characteristics. In this division, we conduct research on nanostructure formation, interface control, elucidation of optical and electronic properties, and device invention with the aim at creating organic thin film devices with optical and electronic functions.
In addition to the development of new film formation and structure control technology for diversifying organic molecules such as vacuum deposition, polymerization film formation, and ink jet film formation, we also work on the correlation interface between structure and function through the functional evaluation of its dielectric property, semiconductor property, conductivity, etc.
With this background, we perform research on the following subjects.
- Kenji Ishida (Professor)(*)
- Yoshiyuki Komoda (Associate Professor)
- Shohei Horike (Assistance Professor)
- Yasuko Koshiba (Research Assistant)
(*) Division Leader
ln our group, we carry on research on novel membrane formation technologies oriented to printable electronics such as: photocontact printing methods, uniaxial-oriented organic semiconductive crystal wire, crystal growth processes performed in ionic solutions etc. Additionally, in dry processes, we are performing research on measurement of substance steam pressure as an important parameter of thin film growth by application of vaccum evaporation method, and, tetramerization reaction of gas-solid interface obtained through chemical vapor deposition.
Development of an Organic Ferroelectric VDF Thin Membrane Oriented to Application in Sensing-Energy conservation
ln Vinylidene fluoride group (-CH2CF2), there is a big vertical dipole in molecules axis from hydrogen and fluorine’s electronegativity diference. Our research aims to obtain highly efficient ferroelectricity, pyroelectricity and piezoelectricity in oscillatory-electric elements, piezoelectric sensors (contact, flexed) infrared-thermosensors (human presence sensors – gas sensors) and organic non-volatile memories by controlling membrane structure and molecule orietation in organic materials such as VDF-related materials, Polyurea, TGS etc.
Rheological Analysis of Particle Dispersion
- Yoshiyuki Komoda
To obtain desirable particulate film from particle dispersion, understanding the internal structure of dispersed particles is indispensable. However, due to the opaque nature of particle dispersion, the evaluation or observation of the structure using transmitted lights is not applicable. Therefore, the stress response against strain applied to particle dispersion, known as rheological analysis, must be a powerful tool. Our objective is to understand the internal structures and their dynamics by combining rheological evaluation with AC impedance, pulsed NMR techniques, and others.
Analysis of the Coating and Drying Processes of Particle Dispersion
- Yoshiyuki Komoda
We examine the effects of the shear application in coating and the solvent evaporation in drying on the internal structure of particle dispersions. Considering the difference in shear histories depending on the coating apparatus, we investigate the operating conditions to control the shape and structure of coating layers. We also study the drying conditions and underlying mechanism to control the internal structure of coating layers through the simultaneous measurements of drying rate, particle packing state, stress development, and others.