Field-effect transistor with a conducting polymer film

Organic thin‐film transistors (OTFTs) have lived to see great improvements in recent years. This review presents new insight into conduction mechanisms and performance characteristics, as well as opportunities for modeling properties of OTFTs. The shifted focus in research from novel chemical structures to fabrication technologies that optimize morphology and structural order is underscored by chapters on vacuum‐deposited and solution‐processed organic semiconducting films. Finally, progress in the growing field of the n‐type OTFTs is discussed in ample detail. The Figure, showing a pentacene film edge on SiO2, illustrates the morphology issue.

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“…[113,114] Another polymeric semiconductor that has been processed from a soluble precursor polymer is PTV. [16,30,86,111] …”

Section: Solution Processed Organic Semiconductor Filmsmentioning

confidence: 99%

Organic Thin Film Transistors for Large Area Electronics

Dimitrakopoulos¹,

2002

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“…Thin layer transistors (TLT) based on π-conjugated polymers or organic molecules is another target device of the π-conjugated polymers [260][261][262][263][264][265] and PTh prepared by the organometallic polycondensation also works as an active layer for TLT. 145b,265…”

Section: Transistormentioning

confidence: 99%

Synthesis of π-Conjugated Polymers Bearing Electronic and Optical Functionalities by Organometallic Polycondensations. Chemical Properties and Applications of the π-Conjugated Polymers

Yamamoto¹

2003

Synlett

107

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Various π-conjugated polymers have been obtained by using organometallic polycondensations mediated by organotransition metal complexes. For example, Ni(0) complex-promoted dehalogenation polycondensation of dihaloaromatic compounds XAr-X affords poly(arylene)s, -(-Ar-)-n . Pd-catalyzed polycondensation gives poly(arylene-ethynylene)s, -(-Ar-C≡C-Ar′-C≡C-)-n . These polymers are electrochemically active, electrically conductive, and light-emitting. Their well-characterized linear structure brings about unique packing of the polymer molecules in the solid. In this review, we report their synthesis by organometallic polycondensations, their basic properties, the ordered structure in the solid, and applications for electronic and optical devices of π-conjugated polymers.

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“…[4] It was reported that OFETs made with regiorandom polythiophenes spun from chloroform had mobilities in the range of only 10 ±5 to 10 ±4 cm 2 V ±1 s ±1 . [5] In contrast, highly regioregular poly(3-hexylthiophene)s (regioregularity more than 91 % head±tail (HT) linkages) exhibited mobilities of 0.05 to 0.1 cm 2 V ±1 s ±1 . This was in part attributed to the structural order in the layers prepared from the regioregular polymer.…”

Section: Introductionmentioning

confidence: 99%

Effect of Molecular Weight and Annealing of Poly(3‐hexylthiophene)s on the Performance of Organic Field‐Effect Transistors

Zen

Pflaum

Hirschmann

et al. 2004

Adv Funct Materials

664

671

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The optical, structural, and electrical properties of thin layers made from poly(3‐hexylthiophene) (P3HT) samples of different molecular weights are presented. As reported in a previous paper by Kline et al., Adv. Mater. 2003, 15, 1519, the mobilities of these layers are a strong function of the molecular weight, with the largest mobility found for the largest molecular weight. Atomic force microscopy studies reveal a complex polycrystalline morphology which changes considerably upon annealing. X‐ray studies show the occurrence of a layered phase for all P3HT fractions, especially after annealing at 150 °C. However, there is no clear correlation between the differences in the transport properties and the data from structural investigations. In order to reveal the processes limiting the mobility in these layers, the transistor properties were investigated as a function of temperature. The mobility decreases continuously with increasing temperatures; with the same trend pronounced thermochromic effects of the P3HT films occur. Apparently, the polymer chains adopt a more twisted, disordered conformation at higher temperatures, leading to interchain transport barriers. We conclude that the backbone conformation of the majority of the bulk material rather than the crystallinity of the layer is the most crucial parameter controlling the charge transport in these P3HT layers. This interpretation is supported by the significant blue‐shift of the solid‐state absorption spectra with decreasing molecular weight, which is indicative of a larger distortion of the P3HT backbone in the low‐molecular weight P3HT layers.

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Field-effect transistor with a conducting polymer film

Cited by 55 publications

References 4 publications

Organic Thin Film Transistors for Large Area Electronics

Organic Thin Film Transistors for Large Area Electronics

Synthesis of π-Conjugated Polymers Bearing Electronic and Optical Functionalities by Organometallic Polycondensations. Chemical Properties and Applications of the π-Conjugated Polymers

Effect of Molecular Weight and Annealing of Poly(3‐hexylthiophene)s on the Performance of Organic Field‐Effect Transistors

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