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US 8,753,916 B2Granted
Semiconductor-nanocrystal/conjugated polymer thin films
AssigneeThe Regents of the University of California
InventorsA. Paul Alivisatos, Janke J. Dittmer, Wendy U. Huynh, Delia Milliron
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Abstract
The invention described herein provides for thin films and methods of making comprising inorganic semiconductor-nanocrystals dispersed in semiconducting-polymers in high loading amounts. The invention also describes photovoltaic devices incorporating the thin films.
Claims30
A method of producing a photovoltaic device, comprising:
- introducing a population of elongated semiconductor nanocrystals into a semiconducting polymer in a binary solvent to form a nanocrystal-polymer composite, the population of elongated nanocrystals having aspect ratios greater than about 2;
- depositing a photoactive film comprising the nanocrystal-polymer composite onto a first planar electrode;
- heating the photoactive film until the binary solvent is substantially removed from the photoactive film;
- aligning at least a portion of the nanocrystals predominantly normal to a plane of the photoactive film such that between about 10 and 99% of the nanocrystals have a long axis which is aligned not more than 20 degrees from a normal to the plane of the photoactive film;
- and
- depositing a second electrode onto the photoactive film opposite the first electrode.
3 more elements
Dependencies are inferred from the claim text.