I am expecting answer more specifically about why nano-structure is required for organic solar cell
Mr Shamjid, Nanostructured material in which layer you have asking......
Actually nanostructured material has high optoelectronic properties compared to bulk material.....
@Karthick
Actually, in Nano structured organic solar cell the nano structured one is its active layer of organic semiconductor. I would like to get the answer related to the importance of nano structured organic semiconductors in organic solar cell.
I hope now it is clear.
Nanostructured materials provide higher surface area which extends effective area for charge collection.
A nanostructured blend commonly called a bulk heterojunction morphology is needed to efficiently dissociate the excitons that are created following photon absorption. The necessary length scales of this bulk heterojunction morphology are directly related to the exciton diffusion length in the given material. For most organic semiconductors the exciton diffusion length is on the order of 10 nm, and as a result optimized morphologies typically contains nanoscale domains on this same length scale (10-20nm). I have included a link that explains the exciton diffusion issue in more detail, but honestly any review paper on organic solar cells will discuss this issue at least briefly. Good luck!
http://xlink.rsc.org/?DOI=c3ee42444h
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