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Advanced Materials

Molecular Self-Assembled Monolayers and Multilayers for Organic and Unconventional Inorganic Thin-Film Transistor Applications

Authors

  • Sara A. DiBenedetto,

    1. Department of Chemistry and the Materials Research Center Northwestern University 2145 Sheridan Road, Evanston, IL 60208 (USA)
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  • Antonio Facchetti,

    Corresponding author
    1. Department of Chemistry and the Materials Research Center Northwestern University 2145 Sheridan Road, Evanston, IL 60208 (USA)
    • Department of Chemistry and the Materials Research Center Northwestern University 2145 Sheridan Road, Evanston, IL 60208 (USA).
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  • Mark A. Ratner,

    Corresponding author
    1. Department of Chemistry and the Materials Research Center Northwestern University 2145 Sheridan Road, Evanston, IL 60208 (USA)
    • Department of Chemistry and the Materials Research Center Northwestern University 2145 Sheridan Road, Evanston, IL 60208 (USA).
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  • Tobin J. Marks

    Corresponding author
    1. Department of Chemistry and the Materials Research Center Northwestern University 2145 Sheridan Road, Evanston, IL 60208 (USA)
    • Department of Chemistry and the Materials Research Center Northwestern University 2145 Sheridan Road, Evanston, IL 60208 (USA).
    Search for more papers by this author

Abstract

Principal goals in organic thin-film transistor (OTFT) gate dielectric research include achieving: (i) low gate leakage currents and good chemical/thermal stability, (ii) minimized interface trap state densities to maximize charge transport efficiency, (iii) compatibility with both p- and n- channel organic semiconductors, (iv) enhanced capacitance to lower OTFT operating voltages, and (v) efficient fabrication via solution-phase processing methods. In this Review, we focus on a prominent class of alternative gate dielectric materials: self-assembled monolayers (SAMs) and multilayers (SAMTs) of organic molecules having good insulating properties and large capacitance values, requisite properties for addressing these challenges. We first describe the formation and properties of SAMs on various surfaces (metals and oxides), followed by a discussion of fundamental factors governing charge transport through SAMs. The last section focuses on the roles that SAMs and SAMTs play in OTFTs, such as surface treatments, gate dielectrics, and finally as the semiconductor layer in ultra-thin OTFTs.

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