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Published on: November 9, 2015
Nanoimprinting-induced nanomorphological transition in polymer solar cells: enhanced electrical and optical
Seonju Jeong1, Changsoon Cho1, Hyunbum Kang1
1†Graduate School of Energy, Environment, Water, and Sustainability (EEWS), ‡Graphene Research Center, §Department of Chemical and Biomolecular Engineering, and ∥Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS), Korea Advanced Institute Science and Technology (KAIST), Daejeon 305-701, Republic of Korea.
Abstract:
We have investigated the effects of a directly nanopatterned active layer on the electrical and optical properties of inverted polymer solar cells (i-PSCs). The capillary force in confined molds plays a critical role in polymer crystallization and phase separation of the film. The nanoimprinting process induced improved crystallization and multidimensional chain alignment of polymers for more effective charge transfer and a fine phase-separation between polymers and [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) to favor exciton dissociation and increase the generation rate of charge transfer excitons. Consequently, the power conversion efficiency with a periodic nanostructure was enhanced from 7.40% to 8.50% and 7.17% to 9.15% in PTB7 and PTB7-Th based i-PSCs, respectively.
