Hybrid polymers as tunable and directly-patternable gate dielectrics in organic thin-film transistors

Abstract

The long-term target of producing all-organic devices requires custom-designed dielectric materials able to be applied and patterned with a wide range of new and fast deposition and patterning methods. Inorganic-organic hybrid polymers such as organic modified ceramics (ORMOCERs) have recently gained considerable attention in polymer electronics. Consisting of organically functionalized inorganic-oxidic units, their material properties can be tuned over a wide range and, in addition, their processing is very flexible providing good compatibility to many materials and substrates and allowing for direct patterning. A study on the application of different ORMOCER systems as gate dielectric layers in organic thin-film transistors (OTFTs) with pentacene as the organic semiconductor and directly structured contact holes is presented. Depending on the chemistry of the underlying ORMOCER system, different morphologies of the thermally evaporated pentacene were observed and correlated to the electrical characteristics of the transistor devices. In some cases, OTFTs with excellent electrical performance were achieved, showing intrinsic field-effect mobility values up to 1 cm(2)/V s. Based on the high charge-carrier mobility of the pentacene-ORMOCER interface and the good dielectric, passivating, and patterning properties of the ORMOCER materials, these devices lay the foundation for a new generation of high-quality, fast, processable low-cost organic electronics

Low‐Voltage Organic Thin‐Film Transistors with High‐k Nanocomposite Gate Dielectrics for Flexible Electronics and Optothermal Sensors

“…A section analysis of the layer sequence was performed by transmission electron microscopy images of thin OTFT lamellae and by elemental mapping at the Research Institute for Electron Microscopy (FELMI) of the University of Technology Graz (see cover picture). The fabrication of the other organic gate dielectrics (BCB, Ormocers, PMMA) has been described elsewhere [17]. The OTFTs are characterized in air in a probe station by means of a standard parametric analyzer (mb-technologies).…”

“…[15] Note that this is true for a large variety of pure organic and organic-inorganic hybrid dielectric materials such as Ormocers, [17] . This demonstrates that the dielectric-semiconductor interface, which is mainly responsible for the performance of OTFT devices, can be engineered in a similar perfect quality on flexible substrates as on glass.…”

Materials and technologies for fabrication of three-dimensional microstructures with sub-100 nm feature sizes by two-photon polymerization

“…[19][20][21] Furthermore, they exhibit excellent optical properties and biocompatibility, thus being a perfect material for micro-optical and biomedical applications. [22][23][24][25][26] For synthesis, alcoxysilane-precursors undergo hydrolysis and polycondensation reactions resulting in an organically modified inorganic-oxidic network ([Si-O] n ).…”

Dielectric properties of poly(4-vinylphenol) with embedded PbO nanoparticles

“…The flexibility and lightness of polymers can offer them to have many advantages. [7,8] Of the polymer dielectrics reported in the literature, poly(4-vinylphenol) (PVPh) has been considered as a dielectric with the highest mobility. [9] Although the mobility is high, an organic TFT (OTFT) with PVPh as the dielectric exhibits a leakage current behavior that leads to up raising with the threshold voltage according to the gate-source voltage.…”