Journal
MACROMOLECULAR RESEARCH
Volume 26, Issue 7, Pages 623-629Publisher
SPRINGER
DOI: 10.1007/s13233-018-6088-y
Keywords
organic photovoltaics; polymeric nanowire; nanowire network; nano-confinement
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Funding
- National Creative Research Initiative Center for Intelligent Hybrids - National Research Foundation of Korea (NRF) [2010-0018290]
- BK21 Plus Program - Ministry of Education, Science, and Technology (MEST) of Korea
- Mid-career Researcher Program - NRF [2016R1A2B3009301]
- Technology Innovation Program (or Industrial Strategic Technology Development Program) - Ministry of Trade, Industry & Energy (MOTIE, Korea)
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Evolution of favourable nanomorphology which can withstand external stimuli is a critical issue for efficient and stable organic solar cells. Here, we demonstrate a novel strategy for the stabilization of nanomorphology of organic solar cells by inducing polymeric nanowire network structures. Thermal annealing of poly(3- hexylthiophene-2,5-diyl) nanowires, highly crystalline, 1-dimensional structures held together through interchain pi-pi stacking, led to the formation of nanowire network structures confirmed through small angle neutron scattering measurements. The physically interconnected network structures form robust electron donor domains and impose confinement which suppresses the aggregation of the electron acceptor, [6,6]-phenyl-C61-butylric acid methyl ester. Organic solar cells having the nanowire network structures showed increased power conversion efficiencies and dramatically enhanced thermal stability compared to bulk heterojunction (BHJ) and non-network nanowire-based devices. Furthermore, the performance of the nanowire network-based devices was inversely related to the size of the networks, attesting to the significance of nanoconfined geometry formed within nanowire network structures.
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