High Performance Materials
Kondo Takashi Laboratory

Photonic materials and perovskite solar cells

Metal-halide perovskite-type semiconductors

Metal-halide perovskite-type materials are a new semiconductor family. It has been revealed that these materials are promising for solar-cell applications. However, fundamental properties of these materials are not clearly understood.
We are now studying fundamental properties and novel crystal growth techniques of metal-halide perovskite-type semiconductors in order to realize innovative photonic devices.

Organic Nonlinear Optical Crystals and Ferroelectrics

We are conducting research on efficient terahertz (THz) wave generation and three-dimensional visualization of ferroelectric domain structures using femtosecond laser irradiation in organic nonlinear optical crystals and ferroelectrics. Organic nonlinear optical crystals are expected to exhibit superior THz emission performance compared to inorganic materials by optimizing molecular orientation and crystal growth conditions. Furthermore, since the crystal quality and spontaneous polarization significantly affect the THz emission characteristics, we are also developing a non-destructive, non-contact three-dimensional domain imaging technique based on machine learning analysis of the emitted THz waveforms.

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My research theme during my graduate school years was organic nonlinear optical crystals. After several turning points, I shifted my research focus to semiconductor materials and ultimately arrived at studying metal halide perovskites. I have been able to utilize various experiences in this research, realizing that nothing is ever wasted. More than anything, I have come to strongly feel that connections with people have guided me to where I am today as a researcher.
An article summarizing the entire flow from the emergence to the current prominence of perovskite solar cells explains how interactions between people led to new discoveries. Although it covers only a small part of what I have experienced, it also introduces the roles played by me and those around me. Please take a look at the article below. I think you'll find it interesting as an unexpected story behind a major discovery.
'Document: The Birth of Perovskite Solar Cells'

Member

• 
• • Professor
    Takashi KONDO
  Research Area: Photonic materials and semiconductor photonic devices

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