Role of Molecular Order and Solid-State Structure in Organic Field-Effect Transistors

Mas‐Torrent, Marta; Rovira, Concepció

doi:10.1021/cr100142w

Cited by 513 publications

(468 citation statements)

References 222 publications

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“…DB-TTF is known to exhibit a complex polymorphism scenario, where four polymorphs have already been identified. [30][31][32] Previous works reported single crystal OFETs based on the most favorable thermodynamically α-phase, while on thin films the kinetically more favorable γ−phase is usually found. Accordingly, here also in both the evaporated and solution casted films, it was observed that the crystals formed belong to such γ−phase (Fig.1b).…”

Section: Resultsmentioning

confidence: 99%

Single Crystal‐Like Performance in Solution‐Coated Thin‐Film Organic Field‐Effect Transistors

Pozo

Fabiano

Pfattner

et al. 2015

Adv Funct Materials

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122

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In electronics, the field-effect transistor (FET) is a crucial corner stone and successful integration of this semiconductor device into circuit applications requires stable and ideal electrical characteristics over a wide range of temperatures and environments. Solution processing, using printing or coating techniques, has been explored to manufacture organic field-effect transistors (OFET) on flexible carriers; enabling radically novel electronics applications. Ideal electrical characteristics, in organic materials, are typically only found in single crystals. Tiresome growth and manipulation of these hamper practical production of flexible OFETs circuits. To date, neither devices nor any circuits, based on solution-processed 2 OFETs, has exhibited an ideal set of characteristics similar or better than today's FET technology based on amorphous silicon (a-Si FETs). Here, we report bar-assisted meniscus shearing of dibenzo-tetrathiafulvalene to coat-process self-organized crystalline organic semiconducting domains with high reproducibility. Including these coatings as the channel in OFETs, we observe electric field-and temperature-independent charge carrier mobility and no bias stress effects. Further, we measure record-high gain in OFET inverters and exceptional operational stability in both air and water.

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Section: Resultsmentioning

confidence: 99%

Single Crystal‐Like Performance in Solution‐Coated Thin‐Film Organic Field‐Effect Transistors

Pozo

Fabiano

Pfattner

et al. 2015

Adv Funct Materials

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122

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“…We remark that molecular order at the nanoscale is revealed of utmost importance. 14,17 Hexabenzocoronene is known to form discotic liquid-crystalline materials with molecules uniaxially oriented along the transport direction with field-effect mobilities reaching 0.01 cm 2 V −1 s −1 . 18,19 However, the substitution pattern followed here may also bring additional non-covalent through-space interactions, 20,21 complementarily to π · · ·π and C−H· · ·π interactions largely found in acene-based materials, which also deserve to be closely investigated by theoretical methods.…”

Section: Introductionmentioning

confidence: 99%

Theoretical study of stability and charge-transport properties of coronene molecule and some of its halogenated derivatives: A path to ambipolar organic-based materials?

Sancho‐García

Pérez-Jiménez

2014

The Journal of Chemical Physics

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We have carefully investigated the structural and electronic properties of coronene and some of its fluorinated and chlorinated derivatives, including full periphery substitution, as well as the preferred orientation of the non-covalent dimer structures subsequently formed. We have paid particular attention to a set of methodological details, to first obtain single-molecule magnitudes as accurately as possible, including next the use of modern dispersion-corrected methods to tackle the corresponding non-covalently bound dimers. Generally speaking, this class of compounds is expected to self-assembly in neighboring π -stacks with dimer stabilization energies ranging from -20 to -30 kcal mol −1 at close distances around 3.0-3.3 Å. Then, in a further step, we have also calculated hole and electron transfer rates of some suitable candidates for ambipolar materials, and corresponding charge mobility values, which are known to critically depend on the supramolecular organization of the samples. For coronene and per-fluorinated coronene, we have found high values for their hopping rates, although slightly smaller for the latter due to an increase (decrease) of the reorganization energies (electronic couplings).

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“…S4). 22,24,25 The hole mobility of the OFET without the SD-PARA layer was almost similar for both the forward and backward direction sweeps, whereas the PEW-OFET exhibited an almost one order of magnitude lower hole mobility for the backward direction sweep than for the forward direction sweep (see Supplementary Figure S5). This large change in the hole mobility for the PEW-OFET reflects the different charged states in the SD-PARA layer upon sweeping the gate voltages in the forward and backward directions.…”

Section: Resultsmentioning

confidence: 98%

Organic nonvolatile memory transistors with self-doped polymer energy well structures

Nam

Hahm

et al. 2013

NPG Asia Mater

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Developing organic nonvolatile memory devices with a writing/reading/erasing logic function in actual array structures is extremely important for realizing low-cost lightweight/flexible plastic electronic systems. Here, we demonstrate that organic field-effect transistors (OFETs) with a polymer energy well structure (PEW-OFET) exhibit excellent nonvolatile memory performances. The PEW structure is created by sandwiching a self-doped poly(o-anthranilic acid) (SD-PARA) nanolayer (high dielectric constant, k ¼ 14) between two low-dielectric polymer layers (k ¼ 2-4). The primary idea behind this concept is the rapid storage and retrieval of charge carriers in the PEW layer during operation due to the high k feature of the SD-PARA nanolayer, which aids the rapid transport of charge carriers inside, whereas the stored charges are safely trapped due to the two low k layers. The results indicate that the PEW-OFET memory devices exhibit outstanding retention characteristics upon continuous reading up to 2000 s after writing, whereas their excellent writing/reading/erasing/reading cyclability is demonstrated in a test with 43000 cycles. Therefore, the present simple yet cost-effective PEW-OFET concept is expected to significantly contribute to the development of low-cost plastic memory array devices because all processes can be inexpensively performed at low temperatures and additional logic transistors are unnecessary.

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Role of Molecular Order and Solid-State Structure in Organic Field-Effect Transistors

Cited by 513 publications

References 222 publications

Single Crystal‐Like Performance in Solution‐Coated Thin‐Film Organic Field‐Effect Transistors

Single Crystal‐Like Performance in Solution‐Coated Thin‐Film Organic Field‐Effect Transistors

Theoretical study of stability and charge-transport properties of coronene molecule and some of its halogenated derivatives: A path to ambipolar organic-based materials?

Organic nonvolatile memory transistors with self-doped polymer energy well structures

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