Journal
ACS NANO
Volume 8, Issue 7, Pages 6778-6787Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn500944f
Keywords
field-effect transistors; Kelvin probe microscopy; molecule symmetry; intralayer and interlayer transport
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Funding
- Engineering and Physical Sciences Research Council (EPSRC)
- Cambridge Overseas Trust
- Chinese Scholarship Council
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We have investigated the influence of the symmetry of the side chain substituents in high-mobility, solution processable n-type molecular semiconductors on the performance of organic field-effect transistors (OFETs). We compare two molecules with the same conjugated core, but either symmetric or asymmetric side chain substituents, and investigate the transport properties and thin film growth mode using scanning Kelvin probe microscopy (SKPM) and atomic force microscopy (AFM). We find that asymmetric side chains can induce a favorable two-dimensional growth mode with a bilayer structure, which enables ultrathin films with a single bilayer to exhibit excellent transport properties, while the symmetric molecules adopt an unfavorable three-dimensional growth mode in which transport in the first monolayer at the interface is severely hindered by high-resistance grain boundaries.
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