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

Karyn Mutkins; Simon S. Y. Chen; Muhsen Aljada; Ben J. Powell; Seth Olsen; Paul L. Burn; Paul Meredith

doi:10.1117/12.892640

7 September 2011 Charge transport properties of carbazole dendrimers in organic field-effect transistors

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

Proceedings Volume 8117, Organic Field-Effect Transistors X; 811704 (2011) https://doi.org/10.1117/12.892640
Event: SPIE Photonic Devices + Applications, 2011, San Diego, California, United States

Abstract

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.

Citation Download Citation

Karyn Mutkins, Simon S. Y. Chen, Muhsen Aljada, Ben J. Powell, Seth Olsen, Paul L. Burn, and Paul Meredith "Charge transport properties of carbazole dendrimers in organic field-effect transistors", Proc. SPIE 8117, Organic Field-Effect Transistors X, 811704 (7 September 2011); https://doi.org/10.1117/12.892640

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available