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

Mutkins, Karyn, Chen, Simon S. Y., Aljada, Muhsen, Powell, Ben J., Olsen, Seth, Burn, Paul L. and Meredith, Paul (2011). Charge transport properties of carbazole dendrimers in organic field-effect transistors. In: Zhenan Bao and Iain McCulloch, Organic Field-Effect Transistors X. Conference on Organic Field-Effect Transistors X, San Diego, United States, (811704.1-811704.8). 22-23 August 2011. doi:10.1117/12.892640

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Author Mutkins, Karyn
Chen, Simon S. Y.
Aljada, Muhsen
Powell, Ben J.
Olsen, Seth
Burn, Paul L.
Meredith, Paul
Title of paper Charge transport properties of carbazole dendrimers in organic field-effect transistors
Conference name Conference on Organic Field-Effect Transistors X
Conference location San Diego, United States
Conference dates 22-23 August 2011
Proceedings title Organic Field-Effect Transistors X   Check publisher's open access policy
Journal name Proceedings of SPIE - International Society for Optical Engineering   Check publisher's open access policy
Place of Publication Bellingham, WA, United States
Publisher S P I E - International Society for Optical Engineering
Publication Year 2011
Sub-type Fully published paper
DOI 10.1117/12.892640
Open Access Status File (Publisher version)
ISBN 9780819487278
ISSN 0277-786X
1996-756X
Editor Zhenan Bao
Iain McCulloch
Volume 8117
Start page 811704.1
End page 811704.8
Total pages 8
Collection year 2012
Language eng
Formatted Abstract/Summary
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.
Keyword OFET
P-type
Dendrimer
Carbazole
Fluorene
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article number 811704.

 
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