Ashifat, it is unclear exactly what you are asking.  PEDOT:PSS is typically used in organic solar cells to modify the ITO electrode and to act as a hole-injector layer.  As such, it is typically coated directly onto the ITO surface. The active layer consisting of a blend of an organic donor material (polymer or small molecule) and an electron acceptor is then processed onto the PEDOT:PSS layer. Such acceptors are typically fullerenes, although carbon nanotubes have also been investigated for this role and I assume this is what you are referring to.  If you can give me a bit more information, I can try to give you a better answer.