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- Title
Ultra-High Efficiency Photovoltaic Cells for Large Scale Solar Power Generation.
- Authors
Nakano, Yoshiaki
- Abstract
The primary targets of our project are to drastically improve the photovoltaic conversion efficiency and to develop new energy storage and delivery technologies. Our approach to obtain an efficiency over 40% starts from the improvement of III-V multi-junction solar cells by introducing a novel material for each cell realizing an ideal combination of bandgaps and lattice-matching. Further improvement incorporates quantum structures such as stacked quantum wells and quantum dots, which allow higher degree of freedom in the design of the bandgap and the lattice strain. Highly controlled arrangement of either quantum dots or quantum wells permits the coupling of the wavefunctions, and thus forms intermediate bands in the bandgap of a host material, which allows multiple photon absorption theoretically leading to a conversion efficiency exceeding 50%. In addition to such improvements, microfabrication technology for the integrated high-efficiency cells and the development of novel material systems that realizes high efficiency and low cost at the same time are investigated.
- Subjects
PHOTOVOLTAIC cells; SOLAR power plants; MICROFABRICATION; BAND gaps; ENERGY conversion; SOLAR concentrators
- Publication
AMBIO - A Journal of the Human Environment, 2012, Vol 41, p125
- ISSN
0044-7447
- Publication type
Article
- DOI
10.1007/s13280-012-0267-4