Dr. Seth C. Olsen Profile

Dr. Seth C. Olsen

at The Univ of Queensland

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Proceedings Article | 8 September 2011 Paper

Charge transport properties of carbazole dendrimers in organic field-effect transistors

Karyn Mutkins, Simon S. Chen, Muhsen Aljada, Ben Powell, Seth Olsen, Paul Burn, Paul Meredith

Proceedings Volume 8117, 811704 (2011) https://doi.org/10.1117/12.892640

KEYWORDS: Dendrimers, Field effect transistors, Transistors, Silica, Polymers, Electrodes, Semiconductors, Gold, P-type semiconductors, Natural surfaces

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We report three generations of p-type dendrimer semiconductors comprised of spirobifluorene cores, carbazole branching units and fluorene surface groups for use in organic field-effect transistors (OFETs). The group of dendrimers are defined by their generation and noted as SBF-(Gx)₂, where x is the generation. Top contact-bottom gate OFETs were fabricated by spin-coating the dendrimers onto an n-octyltrichlorosilane (OTS) passivated silicon dioxide surface. The dendrimer films were found to be amorphous. The highest mobility was measured for the first generation dendrimer (SBF-(G1)₂), which had an average mobility of (6.6 ± 0.2) × 10^-5 cm²/V s and an ON/OFF ratio of 3.0 × 104. As the generation of the dendrimer was increased there was only a slight decrease in the measured mobility in spite of the significantly different molecular sizes of the dendrimers. The mobility of SBF-(G3)₂, which had a hydrodynamic radius almost twice of SBF-(G1)₂, still had an average mobility of (4.7 ± 0.6) × 10^-5 cm²/V s and an ON/OFF ratio of 2.7 × 10³. Density functional theory calculations showed that the highest occupied molecular orbital was distributed over the core and carbazole units meaning that both intra- and intermolecular charge transfer could occur enabling the hole mobility to remain essentially constant even though the dendrimers would pack differently in the solid-state.

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