Tuning surface properties in photosensitive polyimide. Material design for high performance organic thin-film transistors

Chou, Wei‐Yang; Kuo, Chia‐Wei; Chang, Chia-Wen; Yeh, Bo-Liang; Chang, Ming Chau

doi:10.1039/c0jm00196a

Cited by 21 publications

(12 citation statements)

References 36 publications

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“…To our knowledge, this result presents one of the best results of pentacene OTFTs to date. 16,23,24 A threshold voltage is lower than −0.5 V, and a subthreshold swing is about 130 mV/decade calculated from the transfer curve. This subthreshold swing yields a low interface trap density of 2.40 × 10 11 cm −2 , indicating a high quality interface between the pentacene film and the PAA dielectric layer.…”

Section: ■ Results and Discussionmentioning

confidence: 76%

“…There is only a small decrease of 10.8% in the estimation of device mobility when the capacitance value at a frequency of 20 Hz is used, corroborating the outstanding device performance. To our knowledge, this result presents one of the best results of pentacene OTFTs to date. ,, A threshold voltage is lower than −0.5 V, and a subthreshold swing is about 130 mV/decade calculated from the transfer curve. This subthreshold swing yields a low interface trap density of 2.40 × 10 11 cm –2 , indicating a high quality interface between the pentacene film and the PAA dielectric layer .…”

Section: Resultsmentioning

confidence: 84%

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Surface Polarity and Self-Structured Nanogrooves Collaboratively Oriented Molecular Packing for High Crystallinity toward Efficient Charge Transport

Jiang

et al. 2017

J. Am. Chem. Soc.

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Efficient charge transport in organic semiconductors is essential for construction of high performance optoelectronic devices. Herein, for the first time, we demonstrate that poly(amic acid) (PAA), a facilely deposited and annealing-free dielectric layer, can tailor the growth of organic semiconductor films with large area and high crystallinity toward efficient charge transport and high mobility in their thin film transistors. Pentacene is used as a model system to demonstrate the concept with mobility up to 30.6 cm V s, comparable to its high quality single crystal devices. The structure of PAA has corrugations with OH groups pointing out of the surface, and the presence of an amide bond further allows adjacent polymer strands to interact via hydrogen bonding, leading to a self-rippled surface perpendicular to the corrugation. On the other hand, the strong polar groups (-COOH/-CONH) of PAA could provide repulsive forces between PAA and pentacene, which results in the vertical orientation of pentacene on the dielectric surface. Indeed, in comparison with its imidized counterpart polyimide (PI), PAA dielectric significantly enhances the film crystallinity, drastically increases the domain size, and decreases the interface trap density, giving rise to superior device performance with high mobility. This concept can be extended to more organic semiconducting systems, e.g., 2,6-diphenylanthracene (DPA), tetracene, copper phthalocyanine (CuPc), and copper hexadecafluorophthalocyanine (FCuPc), demonstrating the general applicability. The results show the importance of combining surface nanogrooves with the strong polarity in orienting the molecular arrangement for high crystallinity toward efficient charge transport in organic semiconductors.

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Section: ■ Results and Discussionmentioning

confidence: 76%

Section: Resultsmentioning

confidence: 84%

Surface Polarity and Self-Structured Nanogrooves Collaboratively Oriented Molecular Packing for High Crystallinity toward Efficient Charge Transport

Jiang

et al. 2017

J. Am. Chem. Soc.

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“…However, Bae's group found the higher mobility on the higher‐γ S dielectric . In addition, some groups reached a different conclusion that the matched γ S of the dielectric to that of the semiconductor is favorable for the improved mobility . These inconsistent reports exhibit that the relationship between the total surface energy of dielectric and mobility is still unclear.…”

Section: Resultsmentioning

confidence: 99%

Dielectric Selection for Solution‐Processed High‐Mobility TIPS‐Pentacene Microwire Field‐Effect Transistors

Wang

Zhou

Tong

et al. 2019

Adv Materials Inter

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The dielectric effect on the mobility of the solution‐processed organic field‐effect transistors (OFETs) remains unknown. A major challenge is that most of the solution‐processed OFETs are obtained on hydrophilic dielectrics, while most of the commonly used dielectrics for high‐mobility OFETs are hydrophobic. In this work, by selecting a preferred solvent to ensure the good wettability of 6,13‐bis(triisopropylsilylethynyl)‐pentacene (TIPS‐pentacene) solution on both hydrophobic and hydrophilic dielectrics, the highly ordered TIPS‐pentacene single‐crystal microwire arrays are in situ grown on the hydrophobic and hydrophilic dielectrics via a solution‐processed method, and the dielectric effect on the mobility of the solution‐processed TIPS‐pentacene OFETs is investigated. The highest mobility on the divinyltetramethyldisiloxane‐bis(benzocyclobutene) (BCB)/SiO2 dielectric is ascribed to the matching of both the polar and dispersive components of surface energy between dielectric and semiconductor. This work powerfully confirms the direct effect of the dielectric properties on mobility, and provides a new method to select the optimized dielectric for solution‐processed high‐mobility OFETs.

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“…9 So far, apart from single crystals, OTFTs with the best charge carrier transport properties have been fabricated using the VTE technique. 7,8 However, the waste of organic material is significant and the uniformity of the thin film is poor due to the point source used in the conventional VTE technique. Several kinds of evaporation sources, including linear source and area source, have been developed to improve the deposition rate, lower the material waste, and make the uniformity better.…”

Section: Introductionmentioning

confidence: 99%

Realization of uniform large-area pentacene thin film transistor arrays by roller vacuum thermal evaporation

Wang

et al. 2011

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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A conventional vacuum thermal evaporation (VTE) system has been extended to a roller-VTE system with a moving substrate-holder to realize large-area organic film deposition. The multidimensional movement of the substrate-holder guarantees excellent uniformity of the large-area pentacene thin films. An 85-nm-thick pentacene film with a relative standard deviation as low as 2.7% is demonstrated within a 300 mm × 500 mm area. Thin film transistor arrays are then fabricated using the uniform pentacene films. The average transistor mobility is up to 0.85 cm2/V s with a relative standard deviation of 10%.

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Tuning surface properties in photosensitive polyimide. Material design for high performance organic thin-film transistors

Cited by 21 publications

References 36 publications

Surface Polarity and Self-Structured Nanogrooves Collaboratively Oriented Molecular Packing for High Crystallinity toward Efficient Charge Transport

Surface Polarity and Self-Structured Nanogrooves Collaboratively Oriented Molecular Packing for High Crystallinity toward Efficient Charge Transport

Dielectric Selection for Solution‐Processed High‐Mobility TIPS‐Pentacene Microwire Field‐Effect Transistors

Realization of uniform large-area pentacene thin film transistor arrays by roller vacuum thermal evaporation

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