Patent ID: 7119028

Claim:
A film surface imprinted with nanometer-sized particles to produce micro- and/or nano-structured electron and hole collecting interfaces, comprising; at least one transparent substrate; at least one photoabsorbing conjugated polymer applied on a first said substrate, wherein said conjugate polymer includes polybutylthiophene (pbT); a plurality of nanometer-sized particles including multiwalled carbon nanotubes (MWNT), wherein said plurality of nanometer-sized particles including said multiwalled carbon nanotubes produce a charge separation interface; at least one transparent polymerizable layer including a sol-gel or monomer, said MWNT embedded in said conjugated polymer to produce a mixture and applied on a second said substrate to form a MWNT bearing surface film layer to form a stamp surface; wherein said stamp surface is imprinted into the surface of said polymerizable film layer to produce micro- and/or nano-structured electron and hole collecting interfaces; polymerizing said polymerizable film layer to promote shrinkage to form a conformal gap between said MWNT stamp surface and said surface of said polymerizable film layer; and filling said gap with at least one photoabsorbing material to promote the generation of photoexcited electrons and transport to the charge separation interface.