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Decoupling the effects of self-assembled monolayers on gold, silver, and copper organic transistor contacts

Abstract : In bottom-contact organic field-effect transistors (OFETs), the functionalization of source/drain electrodes leads to a tailored surface chemistry for film growth and controlled interface energetics for charge injection. This report describes a comprehensive investigation into separating and correlating the energetic and morphological effects of a self-assembled monolayers (SAMs) treatment on Au, Ag, and Cu electrodes. Fluorinated 5,11-bis(triethylsilylethynyl) anthradithiophene (diF-TES-ADT) and pentafluorobenzenethiol (PFBT) are employed as a soluble small-molecule semiconductor and a SAM material, respectively. Upon SAM modification, the Cu electrode devices benefit from a particularly dramatic performance improvement, closely approaching the performance of OFETs with PFBT-Au and PFBT-Ag. Ultraviolet photoemission spectroscopy, polarized optical microscopy, grazing-incidence wide-angle X-ray scattering elucidate the metal work function change and templated crystal growth with high crystallinity resulting from SAMs. The transmission-line method separates the channel and contact properties from the measured OFET current–voltage data, which conclusively describes the impact of the SAMs on charge injection and transport behavior.
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https://hal-polytechnique.archives-ouvertes.fr/hal-01108002
Contributor : Chang-Hyun Kim <>
Submitted on : Thursday, January 22, 2015 - 2:54:50 AM
Last modification on : Thursday, March 5, 2020 - 6:34:14 PM

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Chang-Hyun Kim, Htay Hlaing, Jong-Am Hong, Ji-Hoon Kim, Yongsup Park, et al.. Decoupling the effects of self-assembled monolayers on gold, silver, and copper organic transistor contacts. Advanced Materials Interfaces, Wiley, 2015, 2 (2), pp.1400384. ⟨10.1002/admi.201400384⟩. ⟨hal-01108002⟩

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