Journal
ADVANCED MATERIALS INTERFACES
Volume 2, Issue 2, Pages -Publisher
WILEY
DOI: 10.1002/admi.201400384
Keywords
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Funding
- Ecole Polytechnique Postdoctoral Research Grant
- U.S. Department of Energy (DOE), the Office of Science, the Office of Basic Energy Sciences [DE-SC0001085]
- National Science Foundation [DMR-1035257]
- National Research Foundation (NRF) of Korea - Korean Government (MSIP) [NRF-2014R1A2A2A01005255]
- Directorate For Engineering [1255494] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn [1255494] Funding Source: National Science Foundation
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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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