Photovoltaic up conversion and down conversion using rare...

Details Photovoltaic up conversion and down conversion using rare... Photovoltaic up conversion and down conversion using rare...

2009-03-20

2011-10-18

Michener, Jennifer K. (Department: 1728)

Batteries: thermoelectric and photoelectric

Photoelectric

Cells

C136S261000

Reexamination Certificate

active

08039736

ABSTRACT:
The use of rare-earth (REO, N, P) based materials to covert long wavelength photons to shorter wavelength photons that can be absorbed in a photovoltaic device (up-conversion) and (REO, N, P) materials which can absorb a short wavelength photon and re-emit one (downshifting) or more longer wavelength photons is disclosed. The wide spectral range of sunlight overlaps with a multitude of energy transitions in rare-earth materials, thus offering multiple up-conversion pathways. The refractive index contrast of rare-earth materials with silicon enables a DBR with >90% peak reflectivity and a stop band greater than 150 nm.

REFERENCES:
patent: 6621211 (2003-09-01), Srivastava et al.
patent: 2005/0156155 (2005-07-01), Atanackovic
patent: 2008/0087326 (2008-04-01), Scholes et al.
patent: 2009/0223553 (2009-09-01), Thoroughgood
patent: 2009/0235974 (2009-09-01), Mapel et al.
patent: 2010/0006143 (2010-01-01), Welser

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