Influence of grain sizes on the mobility of organic thin-film transistors

Carlo, Aldo Di; Piacenza, F.; Bolognesi, A.; Stadlober, Barbara; Maresch, H.

doi:10.1063/1.1954901

Cited by 221 publications

(169 citation statements)

References 17 publications

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“…The y-intercepts are higher for larger grain sizes, which is consistent with their having higher intrinsic mobilities due to reduced grain boundary scattering. [20][21][22] For 0.5 and 0.8 m grain sizes, there is a certain threshold conductivity near 10 −2 S / cm, below which the Seebeck coefficient rises more rapidly than −k / q; we ascribe this to an increase in carrier mobility caused by a reduction in carrier-dopant scattering. This can also be seen in Fig.…”

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confidence: 99%

Thermoelectric and bulk mobility measurements in pentacene thin films

Kim

Shtein

Pipe

2011

Applied Physics Letters

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Low-noise thermoelectric and electrical measurements were used to derive the dependences of Seebeck coefficient and hole mobility on carrier concentration and grain size in the “bulk” regions of thermally evaporated pentacene thin films (in contrast to the channel field-effect mobility typically measured using thin-film transistor geometries). Distinct charge transport regimes were observed for larger (0.5 and 0.8 μm) and smaller (0.2 μm) grain sizes, attributed to carrier-dopant scattering and percolation, respectively.

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confidence: 99%

Thermoelectric and bulk mobility measurements in pentacene thin films

Kim

Shtein

Pipe

2011

Applied Physics Letters

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“…5 Hence, by improving the grain size, one can optimize the electrical properties of the organic film. The possibility that the grain size may limit the mobility has motivated experimental studies of the growth morphology.…”

Section: Introductionmentioning

confidence: 99%

Structure and morphology of perylene films grown on different substrates

Beigmohamadi

Niyamakom

Farahzadi

et al. 2008

Journal of Applied Physics

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In this study the structural and morphological properties of perylene films deposited on different substrates have been investigated. The film properties have been studied by employing a range of techniques including atomic force microscopy, x-ray diffraction, and drop shape analysis for the determination of the surface free energy. For films deposited on top of Al2O3, the perylene molecules have a fiber texture ordering perpendicular to the substrate, while for films deposited on top of a Au(111) layer, only for thicker films above 400nm were diffraction peaks observed. The different growths of perylene on top of these substrates are attributed to the different strengths of the molecule-substrate interaction.

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“…The mobility in polycrystalline semiconducting layers in TFTs strongly depends on the grain size. 16,17 Thus the larger grains probably caused the higher mobility in the films formed with a higher concentration of TFMB. The surface of a P3HT thin film prepared from a solution containing 100:1 CTC:TFMB [ Fig.…”

Section: Resultsmentioning

confidence: 99%

Effects of volatile additives in solutions used to prepare polythiophene-based thin-film transistors

Ichikawa¹,

Yamamura²,

Jeon³

et al. 2011

Journal of Applied Physics

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We investigate the effects of volatile additives in solutions used to prepare thin-film transistors (TFTs) of regioregular poly(3-hexylthiophene) (P3HT). We use the additives trifluoromethylbenzene (TFMB) and methylcyclohexane (MCH) because they are poor solvents for P3HT. The additives improve the performance of the resulting TFTs when the boiling point (T b ) of the major solvent, carbon tetrachloride, is lower than that of the additive. The maximum mobility is (4.0 6 0.9) Â 10 -2 cm 2 V -1 s -1 , which is 6.1 times larger than that of TFTs prepared without TFMB or MCH added to the solution; the on/off ratio and the subthreshold slope were also improved. The relative T b of the solvent and the additive affected the film formation with the amount of TFMB or MCH remaining at the final stage of thin film deposition influencing the precipitation of P3HT aggregates.

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Influence of grain sizes on the mobility of organic thin-film transistors

Cited by 221 publications

References 17 publications

Thermoelectric and bulk mobility measurements in pentacene thin films

Thermoelectric and bulk mobility measurements in pentacene thin films

Structure and morphology of perylene films grown on different substrates

Effects of volatile additives in solutions used to prepare polythiophene-based thin-film transistors

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