Abstract

A new set of linear oligoarylene thiol molecules, namely (40-(Thiophen-2-yl)Biphenyl-3,5-diyl)Dimethanethiol (TBD), (40-(Thiophen-2-yl)Biphenyl-4-yl)Methanethiol (TBM) and ([1,10;40,100]Terphenyl-3,5-diyl)Dimethanethiol (TD), were synthesized and used for functionalizing thepolycrystalline gold electrodes. Such molecules differ for the number of anchoring groups (TBM vs.TBD) and the terminal rings (TD vs. TBD). As shown by electrochemical measurements, they formhomogeneous and pinholes-free self-assembly monolayers (SAMs) when deposited on the goldelectrode. Moreover, the wettability of the functionalized surface and the morphological changes ofpentacene films grown on SAMs were investigated by contact angle and atomic force microscopy,respectively. OTFT has been used as organic gauge for investigating the metal-SAM-organicsemiconductor structure. Charge carriers mobility, threshold voltage, contact resistance were measuredin both air and vacuum to assess the influence of the anchoring groups and the terminal rings to thetransistor performance. Although these SAMs do not show an improvement of mobility due to anincrease of contact resistance, they allow a better modulation of the current flowing across theelectrode-organic semiconductor (OS) interface, pointing out the structural differences between thethree SAMs in terms of resistance drop combined with the critical voltage.

Autore Pugliese

• Hassan Omar Omar

Tutti gli autori

• Casalini S.; Leonardi F.; Bortolotti C.A.; Operamolla A.; Hassan Omar O.; Paltrinieri L.; Albonetti C.;Farinola G.M.; Biscarini F.

Titolo volume/Rivista

Journal of materials chemistry

Anno di pubblicazione

2012

ISSN

1364-5501

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

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Settori ERC

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Codici ASJC

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