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Novel Heterostructured Organic Photovoltaics Formed by Multilayered Direct Nanoimprinting

Multilayered direct nanoimprint is proposed to expand the heterojunction area of an organic solar cell without demolding using a built-in electrode mold. The mold is directly imprinted onto a conventional multilayered planar [poly(3-hexylthiophene) (P3HT)/[6,6]-phenyl-C61-butyric acid methyl ester (PCBM)] heterostructure. The P3HT layer is lifted into the PCBM layer and the boundary of the junction area is successfully expanded, as investigated by simulation. The improvement in the short-circuit current of the photovoltaics as a result of adopting the nanoimprinted device is observed to be approximately 20% compared with planar heterostructured devices without nanopatterns formed under an equivalent sequence.