Abstract
Efficient bulk heterojunction (BHJ) polymer solar cells with a poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) hole transfer layer (HTL) were fabricated via controlling the spin coating speed of the HTL solution on a particular fluorinated tin oxide substrates of a high roughness. It shows that the functions of the photovoltaic devices increase with the increase of the HTL surface roughness. Then, an imprinting technique was employed to transfer a suitable pattern of nanostructure arrays to the surface of active layers. At the optimized spin coating speed, the photovoltaic devices exhibited a 28.4% increase in efficiency after this imprinting treatment compared with that of nonimprinted photovoltaic devices. It is mainly attributed to the achievement of high interface areas between active layers and electrodes, which not only increases optical absorption by scattering but also facilitates charge carrier collection.
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