Issue 17, 2014

Rubicene: a molecular fragment of C70 for use in organic field-effect transistors

Abstract

Rubicene, a molecular fragment of C70, is a promising organic semiconductor material that displays excellent electronic characteristics for use in organic field-effect transistors (OFETs). Bottom-gate/bottom-contact polycrystalline thin-film OFETs using rubicene exhibit a saturation hole mobility of 0.20 cm2 V−1 s−1 and a current on/off ratio (Ion/Ioff) of 1.0 × 104. In addition, the device performance can be improved with a mobility of 0.32 cm2 V−1 s−1 and Ion/Ioff of 2.5 × 104 with pentafluorobenzenethiol (PFBT) self-assembled monolayer (SAM) treatment on Au electrodes. To characterize the interfacial electronic structure and morphology of rubicene on Au and PFBT/Au, ultraviolet photoelectron spectroscopy (UPS), theoretical calculation with density functional theory (DFT) and grazing incidence X-ray diffraction (GIXD) were performed. With PFBT SAM treatment, the hole injection barrier from Au to rubicene is significantly decreased from 1.15 to 0.48 eV due to the formation of a large interface dipole on Au that increased its work function from 4.33 to 5.67 eV. Furthermore, PFBT SAM treatment also induces an “edge-on” configuration of rubicene, which can lead to the increase in carrier mobility. These results indicate that rubicene can serve as a benchmark organic semiconductor for model charge transport studies and in various organic electronic devices.

Graphical abstract: Rubicene: a molecular fragment of C70 for use in organic field-effect transistors

Supplementary files

Article information

Article type
Paper
Submitted
27 ኦክቶ 2013
Accepted
09 ዲሴም 2013
First published
14 ጃንዩ 2014

J. Mater. Chem. C, 2014,2, 3361-3366

Author version available

Rubicene: a molecular fragment of C70 for use in organic field-effect transistors

H. Lee, Y. Zhang, L. Zhang, T. Mirabito, E. K. Burnett, S. Trahan, A. R. Mohebbi, S. C. B. Mannsfeld, F. Wudl and A. L. Briseno, J. Mater. Chem. C, 2014, 2, 3361 DOI: 10.1039/C3TC32117G

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