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Research on Future Generation Solar Cells and Materials

Actuation and Control

Next-generation solar cells, Semiconductor crystal growth, Self-organized quantum dots, Superlattice

 Our aim is to develop innovative photovoltaic technologies on high-efficiency solar cells and materials. New semiconductor materials and new quantum nanostructures are exploited by crystal growth using molecular beam epitaxy to fabricate high-efficiency next-generation solar cells, such as multi-junction tandem solar cell and intermediate band solar cell. One of our targets is demonstrate the intermediate band solar cell, which enables to use photons with energies lower than the band gap energy of the absorber by optical absorption via an intermediate band, resulting in enhancement of energy conversion efficiency. 3-dimensional quantum dot superlattice which consists of multi-stacked layers of self-organized InAs quantum dots is a promising absorber for intermediate band solar cell. Our research includes crystal growth, and structural, electrical, and optical evaluation of thin films and nanostructures, as well as fabrication processes and characterization of photovoltaic devices.

TEM image of self-organized quantum dot superlattice (left) and schematic structure of quantum dot intermediate band solar cell (right).

TEM image of self-organized quantum dot superlattice (left) and schematic structure of quantum dot intermediate band solar cell (right).

Contact Yoshitaka Okada(Research Center for Advanced Science and Technology)
E-mail
URL http://mbe.rcast.u-tokyo.ac.jp/
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