Electroceramics Group

2022.01.13 Update
Electronic ceramics is one of the world's leading fields in Japanese industry. Ceramics generally refers to pottery or porcelain made by sintering powder as a raw material. Especially, what is called electronic ceramics is ceramics in which the behavior of electrons such as insulation property, conductivity property, magnetism, and optical characteristics is strongly related to function. Such electronic ceramics are used by being incorporated into electronic devices such as smart phones and personal computers, or electric circuits such as substations and vehicles. In recent years, due to the development of manufacturing technology and the demand for miniaturization of parts, there are various shapes and sizes of electronic ceramics. In terms of porcelain, a chip shape with a certain size is recalled. However, electronic ceramics of various shapes are manufactured, either in an extremely thin film state or in the form of a single crystal.

In addition to the development of higher performance electronic ceramics, this group is also developing manufacturing technology for producing electronic ceramics. Through these, we aim to contribute to further progress such as information and communication technology with remarkable progress or technology for energy conservation.

Electron microscope image of a composite ceramics made from crystalline and amorphous materials.

Current rectification behavior observed at interfaces in ceramics


First of all, we are studying to clarify the origins of the functions exhibited by electronic ceramics. In the most fundamental part, we analyze the behavior of electrons that govern the function of ceramics by combining theoretical calculation and electron spectroscopy. Many ceramics are made of agglomerated fine particles. Therefore, it is a very complicated material that contains various structural elements including grain boundaries and pores between particles. Therefore, in order to elucidate the complicated characteristics of electronic ceramics from the fundamentals, we are conducting a study to formulate a model that extracts elements out of complicated structures and accumulate knowledge gained by using that model .

On the other hand, we are involved in the development of thin film synthesis technology in order to enable development of electronic ceramics which is increasingly miniaturized and high performance. Especially, I am working on epitaxy technology.

Surface of zinc oxide single crystal after heating at 1200℃ observed with an atomic force microscope. Height of every single steps, e.g., 0.26 nm, corresponds to the size of crystalline lattices.

A cross sectional mage of polarity flipping interface appeared in a oxide thin film observed with an electron microscope and schematic model based on the observation.


Facilities for synthesis and fabrication :
Pulse laser deposition
Molecular beam epitaxy
Nitride synthesis furnace
RF sputtering deposition
Gas flow controlled furnace
Plasma treatment
Precision lapping

Facilities for characterization and measurements :
Programed thermal desorption analysis
Hall effect and DLTS
Photoluminescence maping
UV-VIS-NIR spectrometer
Wavelength dispersive fs-laser
XPS/UPS spectrometer with high temperature sample stage
X-ray fluorescence spectrometer with mapping functions
High resolution scanning electron microscope
Raman scattering microscope
Cathodoluminescence spectrometer

Computers and software :
Two nodes workstations
Electronic structure simulation software

Pulse-laser-deposition system involving an Nd:YAG laser and an excimer laser.

Cathodoluminescence spectrometer applicable to deep UV emission.: Capable to 198-800 nm in wavelength range by employing chromatic aberration free optics.

XPS/UPS spectrometer with high a temperature sample stage: Appropriate for characterization of electronic structure at high temperature.

High temperature furnaces with gas flow controller: enabling heat treatment under various atmosphere, such as hydrogen atmosphere, ammonia atmosphere, humid atmosphere etc.