Dr. Takeshi TAYAGAKI
Associate Professor, Institute for Chemical Research, Kyoto University
E-mail: tayagaki(at)scl.kyoto-u.ac.jp

News

2014.12.02 Talks at Optical Nanostructures and Advanced Materials for Photovoltaics (PV)
2014.11.23 Tutorial and talk at 6th World Conferenceon Photovoltaic Energy Conversion (WCPEC-6)
2014.11.19 Simulation studies on Ge/Si quantum dot solar cells are published in Appl. Phys. Express and Jpn. J. Appl. Phys.
2014.11.06 Invited talk at 10th China SoG Silicon and PV Power Conference (CSPV10)
2014.09.22 Presentation at 29th European PV Solar Energy Conference and Exhibition (EU PVSEC 2014)
2013.09.18 Talk at JSAP Fall Meeting
2014.09.10 Talk at Solid State Devices and Materials (SSDM2014)
2014.01.22 Photonic nanostructures fabricated from quantum dots is published in Optics Express
2013.09.26 Press release of Si-based quantum dot solar cells (Japanese/English)
2013.09.26 Si/Ge quantum dot solar cells is published in Scientific Reports

Research: Quantum PhotoPhysics


Current Research Topic: Optoelectronics in Nanostructures

Thema

1. Novel Solar Cell Concept and Photon Management

2. Semiconductor Nanooptics

3. Amazing Photoexcited States in Semiconductor Materials

CV

1994: Graduated from Niigata High School
1998: Graduated from Bachelor Course, Faculty of Science, Kyoto University
2000: Graduated from Master Course, Department of Physics, Kyoto University
2004: Graduated from Dr. Course, Department of Physics, Kyoto University
2004: D. Sc., Kyoto University

2004-2005: Post-doc Researcher, Department of Applied Physics, The University of Tokyo
2005-2007: Assistant Professor, Department of Applied Physics, The University of Tokyo
2007-2011: Assistant Professor, Institute for Chemical Research, Kyoto University
2011-present: Associate Professor, Institute for Chemical Research, Kyoto University

AWARD
The 5th Young Scientist Award from The Physical Society of Japan,
"Studies on the High-Density Photoexcited States in Semiconductor Materials"

Project

Grants-in-Aid for Young Scientist (B)

"Carrier amplification in semiconductor quantum dots"

Principle Investigator, FY2014-FY2015 (\3,900,000)

JST ALCA Project

"Integration of nanostructures in crystalline silicon solar cells for advanced management of photons and carriers"

Co-Investigator, FY2011-FY2016 (\105,040,000)

We propose to integrate nanostructures to consist of nanophotonic crystals and quantum dots in crystalline Si solar cells for advanced management of photons and carriers. By utilizing strong interaction between photons and nanostructures, absorption of lower energy photons by quantum dots, and suppression of carrier recombination by spatial separation of electrons and holes, we will demonstrate that proposed solar cells could drastically improve the performance of solar cells.

JST PRESTO Project

"Controlling of the many-body interaction between photoexcited carriers toward hot carrier solar cells"

Principal Investigator, FY2009-FY2012 (\43,381,000)

We examine the mechanism of many-body interaction between photoexcited carriers in the semiconductor nanostructures by using the ultrafast laser spectroscopy and designing the nanostructures. We explore the unique hot carrier solar cells using the excess energy of photoexcited carriers in order to realize highly efficient solar cells.

Grants-in-Aid for Young Scientist (B)

"Control of high-density carrier dynamics in silicon nanostructures"

Principal Investigator, FY2009-FY2010 (\4,680,000)

Auger recombination appears under high-density photocarrier conditions in semiconductor nanostructures. It plays an important role for optical applications of semiconductor nanostructures to optoelectronic devices such as laser and solar cells. We studied photoluminescence dynamics under high-density photoexcitation in silicon-based nanostructures with various structural parameters and under an electric field. We found that the Auger recombination rates depend strongly on the shape of nanostructures and that the control of Auger recombination is available by manipulating the wave functions of photocarriers in designed confinement potential.

Photo

Photo for ICR OBAKU (News Letter by ICR)

HOKUTO site for large scale PV systems

Solar Boat (MALT's Mermaid)