Organic Thin Film Transistors Incorporating Solution Processable Thieno[3,2-b]thiophene Thienoacenes

Rice, Nicole A.; Magnan, François; Melville, Owen A.; Brusso, Jaclyn L.

doi:10.3390/ma11010008

Cited by 9 publications

(8 citation statements)

References 36 publications

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“…The ambipolar behavior for PCPF 60 –SWNT and IsoSol‐S100 was significantly altered when the devices were evaluated under vacuum ( P < 0.1 Pa), with the majority charge carrier switching to electrons. Suppressed hole transport under vacuum was observed for PCPF 60 –SWNT and IsoSol‐S100 (Table S4, Supporting Information), an effect seen previously in SWNT OTFTs, as well as for both p‐type semiconducting polymers and small molecules . Surprisingly, PCPF 60 –SWNT‐EP still retains a significant amount of p‐type character when analyzed in vacuum, potentially by lowering the contact resistance between the nanotubes and the gold electrodes through the polymer phase which has a deeper HOMO level .…”

Section: Resultsmentioning

confidence: 55%

Polycarbazole‐Sorted Semiconducting Single‐Walled Carbon Nanotubes for Incorporation into Organic Thin Film Transistors

Rice

Bodnaryk

Mirka

et al. 2018

Adv Elect Materials

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chemical and physical properties, including high mechanical strength, flexi bility, and unique optical and electrical properties. [1,2] The flexibility and stretch ability of carbon nanotubes, combined with their potential for comparable elec trical performance to traditional rigid materials (such as polysilicon and metal oxides) makes them particularly attractive for applications in wearable electronics, prosthetics, and flexible and printed elec tronics. [3] Their capacity for high charge carrier mobilities, [4] combined with solu tion processability, has resulted in the incorporation of SWNTs into photovol taics, [5] field effect transistors, [6] chem ical and biological sensors, [7][8][9] logic circuits, [10,11] and infrared photodetectors for telecommunications. [12] The structural polydispersity of as synthesized SWNTs, both in atomic struc ture and length, remains a major issue hindering widespread applications of these materials into electronics devices. [13] While some synthetic control over the diameter distribution can be achieved, all common techniques produce a dis tribution of chiralities and a mixture of both metallic and semiconducting nano tubes. [14] These mixtures are normally comprised of a ratio of ≈2:1 semiconducting SWNTs (scSWNTs) to metallic SWNTs (mSWNTs), in addition to the retention of impurities such as catalyst particles and amorphous carbon. This disparity in terms of electrical properties is not suitable for organic elec tronic devices, as mSWNTs can act as percolating or directly bridging paths that electrically short SWNT transistors, making the isolation of pure scSWNTs from a raw mixture of the utmost importance. [15] Additionally, SWNTs have poor solu bility and require the introduction of ancillary dispersants to properly exfoliate tube bundles to allow for the fabrication of uniform networks.Significant progress in the dispersion and separation of SWNTs according to electronic character, [16] chirality, [17] diameter, [18] or length [19] has been made over the past two decades. Density gradient ultracentrifugation, [20] gel chromatography, [21] DNA wrapping combined with ion The realization of organic thin film transistors (OTFTs) with performances that support low-cost and large-area fabrication remains an important and challenging topic of investigation. The unique electrical properties of singlewalled carbon nanotubes (SWNTs) make them promising building blocks for next generation electronic devices. Significant advances in the enrichment of semiconducting SWNTs, particularly via π-conjugated polymers for purification and dispersal, have allowed the preparation of high-performance OTFTs on a small scale. The intimate interaction of the conjugated polymer with both SWNTs and the dielectric necessitates the investigation of a variety of conjugated polymer derivatives for device optimization. Here, the preparation of polymer-SWNT composites containing carbazole moieties, a monomer unit that has remained relatively overlooked for the dispersal of large-diameter semiconducting...

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Section: Resultsmentioning

confidence: 55%

Polycarbazole‐Sorted Semiconducting Single‐Walled Carbon Nanotubes for Incorporation into Organic Thin Film Transistors

Rice

Bodnaryk

Mirka

et al. 2018

Adv Elect Materials

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“…The largest impact on SiPc device performance was the characterization atmosphere, for which we initially evaluated in an evacuated chamber ( P < 0.1 Pa) and then in air at atmospheric pressure after the devices had been removed from vacuum for 5 min. While our previous studies had looked at this comparison for carbon nanotubes wrapped in semiconducting polymers, P‐type small molecules, and conjugated polymers, we have not yet examined this effect on N‐type small molecules, which are particularly sensitive to oxygen. Table 2 summarizes the changes observed for a single set (one substrate) of devices for each material, with Figure showing sample transfer curves under each condition for material 2 .…”

Section: Resultsmentioning

confidence: 99%

Ambipolarity and Air Stability of Silicon Phthalocyanine Organic Thin‐Film Transistors

Melville

Grant

Mirka

et al. 2019

Adv Elect Materials

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Silicon phthalocyanines (SiPcs) are a class of conjugated, planar molecule that have recently been investigated for use in organic photovoltaics (OPVs), organic light‐emitting diodes (OLEDs), and organic thin‐film transistors (OTFTs) due to their variable structure and ease of synthesis. Bottom‐gate, bottom‐contact OTFTs with four SiPc derivatives used as the semiconducting layers are prepared using physical vapor deposition. Devices using bis(pentafluorophenoxy) silicon phthalocyanine (F10‐SiPc) deposited on 140 °C substrates demonstrate electron field‐effect mobilities (μ) of up to 0.54 cm2 V−1 s−1, among the best currently reported for N‐type phthalocyanine‐based transistors. All materials show dramatic changes in charge transport when characterized under vacuum (P < 0.1 Pa) compared to in air at atmospheric pressure, typically switching from electron majority charge carriers to holes, with the change dependent on material structure and energetics. F10‐SiPc is close to balanced ambipolar in air, with μ around 5 × 10−3 cm2 V−1 s−1 for both holes and electrons. These results demonstrate SiPcs' potential as N‐type semiconductors in OTFTs as well as their adjustable charge transport as affected by operation environment.

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“…Our research group has recently found signicant changes in P-type small molecules when tested in air compared to vacuum (P < 0.1 Pa) 46 and demonstrated differences in temperature response under these conditions for two P-type semiconducting polymers. 31 Therefore, we characterized these CuPc and F 16 -CuPc devices at discrete temperatures ranging from T ¼ 25 C to T ¼ 90 C in air and from 25 C to T ¼ 100 C in vacuum.…”

Section: Effect Of Otft Operation Temperaturementioning

confidence: 98%

P and N type copper phthalocyanines as effective semiconductors in organic thin-film transistor based DNA biosensors at elevated temperatures

et al. 2019

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Organic Thin Film Transistors Incorporating Solution Processable Thieno[3,2-b]thiophene Thienoacenes

Cited by 9 publications

References 36 publications

Polycarbazole‐Sorted Semiconducting Single‐Walled Carbon Nanotubes for Incorporation into Organic Thin Film Transistors

Polycarbazole‐Sorted Semiconducting Single‐Walled Carbon Nanotubes for Incorporation into Organic Thin Film Transistors

Ambipolarity and Air Stability of Silicon Phthalocyanine Organic Thin‐Film Transistors

P and N type copper phthalocyanines as effective semiconductors in organic thin-film transistor based DNA biosensors at elevated temperatures

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