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1 Results In high-performance organic solar cells,the photoactive layer consists of a blend of an electron donor and an electron acceptor constituent,a so-called bulk heterojunction.The requirements to morphology of the efficient photoactive layer are nanoscale phase separation,which provides large interface area for exciton dissociation,and at the same time continuous pathways for transport of free charge carriers to the appropriate electrodes.In this context,the research is now focused on a better understanding of the influence of morphology (particularly,the nanoscale organisation of the phase segregated constituents) on the physical properties of the active layer.Because the active layer is deposited from solution,several parameters determine morphology formation,such as blending ratio,a solvent used and its evaporation rate,post treatments like annealing,etc.
1 Results In high-performance organic solar cells, the photoactive layer consists of a blend of an electron donor and an electron acceptor constituent, a so-called bulk heterojunction. These requirements to morphology of the efficient photoactive layer are nanoscale phase separation, provided large interface area for exciton dissociation, and at the same time continuous pathways for transport of free charge carriers to the appropriate electrodes. In this context, the research is now focused on a better understanding of the influence of morphology (particularly, the nanoscale organization of the phase segregated constituents) on the physical properties of the active layer. Since the active layer is deposited from solution, several parameters determine morphology formation, such as blending ratio, a solvent used and its evaporation rate, post treatment like annealing, etc.