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QUANTUM DOT SENSITIZED SOLAR CELL

United States Patent Application

20120103404
A1
View the Complete Application at the US Patent & Trademark Office
Los Alamos National Laboratory - Visit the Technology Transfer Division Website
Photoelectrochemical solar cells (PECs) consisting of a photoanode were prepared by direct deposition of independently synthesized CdSe nanocrystal quantum dots (NQDs) onto a nanocrystalline TiO.sub.2 film (NQD/TiO.sub.2), aqueous Na.sub.2S or Li.sub.2S electrolyte and a Pt counter electrode. The light harvesting efficiency (LHE) of the NQD/TiO.sub.2 photoanode is significantly enhanced when the NQD surface passivation is changed from tri-n-octylphosphine oxide (TOPO) to a smaller ligand (e.g. n-butylamine (BA)). Using NQDs with a shorter passivating ligand, BA, leads to a significant enhancement in both the electron injection efficiency at the NQD/TiO.sub.2 interface and charge collection efficiency at the NQD/electrolyte interface, with the latter attributed mostly to a more efficient diffusion of the electrolyte through the pores of the photoanode. By utilizing BA capped NQDs and aqueous Li.sub.2S as an electrolyte, it is possible to achieve about 100% internal quantum efficiency of photon-to-electron conversion, matching the performance of dye sensitized solar cells.
Fuke, Nobuhiro (Los Alamos, NM), Koposov, Alexey Y. (Los Alamos, NM), Sykora, Milan (Los Alamos, NM), Hoch, Laura B. (Toronto, CA), Manner, Virginia W. (Los Alamos, NM)
LOS ALAMOS NATIONAL SECURITY, LLC (Los Alamos NM)
13/ 274,675
October 17, 2011
STATEMENT REGARDING FEDERAL RIGHTS [0002] This invention was made with government support under Contract No. DE-AC52-06NA25396 awarded by the U.S. Department of Energy and made under CRADA number LA08C10583 with the SHARP Corporation. The government has certain rights in the invention.