2. Research
  3. Researcher's Profile
  4. Kentaroh WATANABE

Researcher's Profile

  • Project Lecturer
  • Kentaroh WATANABE
  • Energy System


March 2002 Department of Science (BS), Hokkaido University
March 2007 Department of Science (Ph.D.), The University of Tokyo (UTokyo)
April 2007 Research Scientist, Institute of Space Astronautical Science, Japan Aerospace Exprolaration Agency
April 2009 Project Assistant Professor, RCAST, UTokyo
April 2014 Project Assistant Professor, Department of Engineering, UTokyo
November 2015 Project Lecturer RCAST, UTokyo

Research Interests

In order to reduce the earth-warming gas (CO2) from conventional fire power plants, the energy conversion with high performance solar cells is one of the feasible solution. In our project, ultra-high efficiency solar cells are the target of research and development. The multi-junction solar cells consisting of III-V compound semiconductors will be achieve 50% energy conversion efficiency. The most important factor for realising an ultra-high efficiency is the quality of semiconductor crystal. We are working on the metalorganic vapour phase epitaxy (MOVPE) method for novel growth technique including a construction of nano-structure. Not only the multi-junction solar cells, but also the nano-structural semiconductor is promised as a candidate of the new-generation solar cell such as an intermediate-band solar cell or a hot-carrier solar cell. They are new concept solar cells used novel physical processes for energy conversion from light to electricity. On the other hand, the low-cost production technology is also important issue for application. We focus on the optical management technology in very thin film solar cell with light trapping and luminescent coupling effect. By reducing the cell thickness drastically, improved material consumption and production speed can contribute to production cost.

High efficiency multi-junction solar cell for concentrator application
Fig.1 High efficiency multi-junction solar cell for concentrator application
Collimating Fresnel lens
Fig.2 Collimating Fresnel lens
Fig.3 Concentrator PV module mounted on the 2-axis sun tracker


Solar cell, Energy conversion, Compound semiconductor

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