Self-Aligned Growth of Organic Semiconductor Single Crystals by Electric Field

Kotsuki, Kenji; Obata, Seiji; Saiki, Koichiro

doi:10.1021/acs.langmuir.5b03975

Cited by 30 publications

(26 citation statements)

References 31 publications

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“…In addition to the above parameters, the use of electrical field for alignment and placement of organic electronic materials has also been reported in examples such as alignment of liquid crystals and OSC crystallites, manipulation of OSC solution droplets, self‐assembly of organic fibers, and morphology modification of polymer blends . These works were mostly descriptive and proposed heuristic explanations to the interaction between field and matter.…”

Section: Introductionmentioning

confidence: 99%

Electric Field Tuning Molecular Packing and Electrical Properties of Solution‐Shearing Coated Organic Semiconducting Thin Films

Molina‐Lopez

Yan

et al. 2017

Adv Funct Materials

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Recent improvements in solution-coated organic semiconductors (OSCs) evidence their high potential for cost-efficient organic electronics and sensors. Molecular packing structure determines the charge transport property of molecular solids. However, it remains challenging to control the molecular packing structure for a given OSC. Here, the application of alternating electric fields is reported to fine-tune the crystal packing of OSC solution-shearing coated at ambient conditions. First, a theoretical model based on dielectrophoresis is developed to guide the selection of the optimal conditions (frequency and amplitude) of the electric field applied through the solutionshearing blade during coating of OSC thin films. Next, electric field-induced polymorphism is demonstrated for OSCs with both herringbone and 2D brickwall packing motifs in 2,7-dioctyl[1]benzothieno[3,2-b][1] benzothiophene and 6,13-bis(triisopropylsilylethynyl) pentacene, respectively. Favorable molecular packing can be accessible in some cases, resulting in higher charge carrier mobilities. This work provides a new approach to tune the properties of solution-coated OSCs in functional devices for highperformance printed electronics.

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Section: Introductionmentioning

confidence: 99%

Electric Field Tuning Molecular Packing and Electrical Properties of Solution‐Shearing Coated Organic Semiconducting Thin Films

Molina‐Lopez

Yan

et al. 2017

Adv Funct Materials

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“…Collet et al combined F DEP and F c to pattern silicon nanowires . Besides the silicon nanowires, recently the electric field was utilized to achieve in situ growth and patterning of organic single crystals on electrode patterns . Nevertheless, the existence of electrode patterns had influenced the crystallization of organic crystals, leading to the nonuniformity of the crystals both in sizes and morphologies.…”

mentioning

confidence: 99%

Precise Patterning of Organic Single Crystals via Capillary‐Assisted Alternating‐Electric Field

Zhang

Jie

Sun

et al. 2017

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Owing to the extraordinary properties, organic micro/nanocrystals are important building blocks for future low-cost and high-performance organic electronic devices. However, integrated device application of the organic micro/nanocrystals is hampered by the difficulty in high-throughput, high-precision patterning of the micro/nanocrystals. In this study, the authors demonstrate, for the first time, a facile capillary-assisted alternating-electric field method for the large-scale assembling and patterning of both 0D and 1D organic crystals. These crystals can be precisely patterned at the photolithography defined holes/channels at the substrate with the yield up to 95% in 1 mm . The mechanism of assembly kinetics is systematically studied by the electric field distribution simulation and experimental investigations. By using the strategy, various organic micro/nanocrystal patterns are obtained by simply altering the geometries of the photoresist patterns on substrates. Moreover, ultraviolet photodetectors based on the patterned Alq3 micro/nanocrystals exhibit visible-blind photoresponse with high sensitivity as well as excellent stability and reproducibility. This work paves the way toward high-integration, high-performance organic electronic, and optoelectronic devices from the organic micro/nanocrystals.

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“…Accordingly, charge transport favorably occurs along the direction of the long axis of the NWs [25]. So far, several reports have demonstrated successful enhancement in molecular ordering and charge transport of a conjugated polymer thin film by the incorporation of the 1-D NWs of the corresponding polymer [9,[26][27][28][29][30]. Post-solvent vapor annealing is envisioned to further enhance molecular ordering of NW-embedded conjugated polymer thin films commensurate with efficient charge transport.…”

Section: Introductionmentioning

confidence: 99%

Effects of Solvent Vapor Annealing on Morphology and Charge Transport of Poly(3-hexylthiophene) (P3HT) Films Incorporated with Preformed P3HT Nanowires

2020

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We systematically studied the influence of solvent vapor annealing on the molecular ordering, morphologies, and charge transport properties of poly(3-hexylthiophene) (P3HT) thin films embedded with preformed crystalline P3HT nanowires (NWs). Solvent vapor annealing (SVA) with chloroform (CF) was found to profoundly impact on the structural and morphological changes, and thus on the charge transport characteristics, of the P3HT-NW-embedded P3HT films. With increased annealing time, the density of crystalline P3HT NWs was increased within the resultant films, and also intra- and intermolecular interactions of the corresponding films were significantly improved. As a result, the P3HT-NW-embedded P3HT films annealed with CF vapor for 20 min resulted in a maximized charge carrier mobility of ~0.102 cm2 V−1 s−1, which is higher than that of pristine P3HT films by 4.4-fold (μ = ~0.023 cm2 V−1 s−1).

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Self-Aligned Growth of Organic Semiconductor Single Crystals by Electric Field

Cited by 30 publications

References 31 publications

Electric Field Tuning Molecular Packing and Electrical Properties of Solution‐Shearing Coated Organic Semiconducting Thin Films

Electric Field Tuning Molecular Packing and Electrical Properties of Solution‐Shearing Coated Organic Semiconducting Thin Films

Precise Patterning of Organic Single Crystals via Capillary‐Assisted Alternating‐Electric Field

Effects of Solvent Vapor Annealing on Morphology and Charge Transport of Poly(3-hexylthiophene) (P3HT) Films Incorporated with Preformed P3HT Nanowires

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