Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 111, Issue 28, Pages 10055-10060Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1409514111
Keywords
soft materials; disordered properties; charge generation
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Funding
- Argonne-Northwestern Solar Energy Research Center, an Energy Frontier Research Center - US Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001059]
- Air Force Office of Scientific Research Multidisciplinary University Research Initiative [FA9550-11-1-0275]
- National Science Foundation (NSF) [NSF DGE-0824162]
- Israel-US Binational Science Foundation [2011509]
- Northwestern Materials Research Science and Engineering Center [NSF DMR-1121262]
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High-performance solution-processed organic semiconductors maintain macroscopic functionality even in the presence of microscopic disorder. Here we show that the functional robustness of certain organic materials arises from the ability of molecules to create connected mesoscopic electrical networks, even in the absence of periodic order. The hierarchical network structures of two families of important organic photovoltaic acceptors, functionalized fullerenes and perylene diimides, are analyzed using a newly developed graph methodology. The results establish a connection between network robustness and molecular topology, and also demonstrate that solubilizing moieties play a large role in disrupting the molecular networks responsible for charge transport. A clear link is established between the success of mono and bis functionalized fullerene acceptors in organic photovoltaics and their ability to construct mesoscopically connected electrical networks over length scales of 10 nm.
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