Electronic functionalization of the surface of organic semiconductors with self-assembled monolayers

Abstract

Molecular self-assembly has been extensively used for surface modification of metals and oxides for a variety of applications, including molecular and organic electronics. One of the goals of this research is to learn how the electronic properties of these surfaces can be modified by self-assembled monolayers (SAM). Here, we demonstrate a new type of molecular self-assembly: the growth of organosilane SAMs at the surface of organic semiconductors, which results in a dramatic increase of the surface conductivity of organic materials. For organosilane molecules with a large dipole moment, SAM-induced surface conductivity of organic molecular crystals approaches 10^-5 S per square, which is comparable to the highest conductivity realized in organic field-effect transistors (OFETs) at ultra-high densities of charge carriers. SAM-functionalized organic surfaces are fully accessible to the environment which makes them very attractive for sensing applications. We have observed that the interaction of vapors of polar molecules with SAM-functionalized organic semiconductors results in a fast and reversible change of the conductivity, proportional to the pressure of an analyte vapor.

References in corpus (8)

• Intrinsic charge transport on the surface of organic semiconductors
• Organic Single-Crystal Field-Effect Transistors
• Tunable Frohlich Polarons in Organic Single-Crystal Transistors
• Threshold Voltage Shift in Organic Field Effect Transistors by Dipole-Monolayers on the Gate Insulator
• Field Effect Transistors on Rubrene Single Crystals with Parylene Gate Insulator
• Effects of polarized organosilane self-assembled monolayers on organic single-crystal field-effect transistors
• Influence of the gate leakage current on the stability of organic single-crystal field-effect transistors
• Interaction of Organic Surfaces with Active Species in the High-Vacuum Environment

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