US Patent 8003881 - Electron donor polymer nanofibrils for photovoltaics

http://www.freepatentsonline.com/8003881.html

This patent from the Commissariat a l'Energie Atomique teaches a solution-based process for forming photovoltaic cells from polymer nanofibrils without requiring annealing. Claim 1 reads:

1. A method of preparing a polymeric composition with photovoltaic properties, comprising

a step of blending, in a solvent encouraging the production of nanofibrils, at least one electron donor type semiconductor polymeric material essentially in the form of the nanofibrils and at least one electron acceptor type material in the solvent,

said nanofibrils representing 50% to 93% by weight of the electron donor type semiconductor polymeric material.