Surface morphology of fluorene thin film fabricated by electrospray deposition technique using two organic solvents: Application for organic light-emitting diodes

Fukuda, Tsuguo; Asaki, Hirotaka; Asano, Tanemasa; Takagi, Kenji; Honda, Zentaro; Kamata, Norihiko; Ju, Jungmyoung; Yamagata, Yutaka

doi:10.1016/j.tsf.2011.07.048

Cited by 43 publications

(34 citation statements)

References 35 publications

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“…8a-d) suggest that sphere formation occurs, but they collapse leaving behind the characteristic splattered circular droplet mark around which these crystallite spikes get arranged. 38 As observed with acetone possessing highest volatility, intact spheres were not formed instead it resulted in burst spheres. 8a), whereas for CB (Fig.…”

Section: Dtcpa In Tetrahydrofuranmentioning

confidence: 92%

Design and morphology control of a thiophene derivative through electrospraying using various solvents

Khanum

Ramamurthy

2015

RSC Adv.

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In the present work, electrospraying of an organic molecule is carried out using various solvents, obtaining fibril structures along with a range of distinct morphologies. Solvent characteristics play a major role in achieving the morphology of the organic material. A thiophene derivative (7, 9-di (thiophen-2-yl)-8H-cyclopenta[a]acenaphthylen-8-one) (DTCPA) of donor-acceptordonor (DAD) architecture is used to study this solvent effect. Seven solvents with decreasing vapour pressure are selected for experiments. Electrospraying is conducted at a solution concentration of 1.5 wt % and a constant applied voltage of 15 kV. Gradual transformation in morphology of the electrospun product from spikes-sphere to only spikes is observed. A mechanism describing this transformation is proposed based on the electron micrograph analysis and XRD analysis. These data indicate that the morphological change is due to the synergistic effect of both vapour pressure and dielectric constant of the solvents. Through a reasonable control over the crystallites size and morphology along with supporting transformation mechanism theory, this study elucidates electrospraying as a prospective method for designing the architectures in organic electronics.

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Section: Dtcpa In Tetrahydrofuranmentioning

confidence: 92%

Design and morphology control of a thiophene derivative through electrospraying using various solvents

Khanum

Ramamurthy

2015

RSC Adv.

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“…TIPS pentacene was dissolved in a mixed solvent of 1,2-diclorobenzene (o-DCB) and acetone (1:1 (v/v), 0.1 wt% in concentration). For multi-jet spraying (which is suitable for large-area uniform deposition) [17], it is necessary to mix the good solvent (o-DCB) with an additional solvent that has a high relative dielectric constant such as acetone (e r = 21.0) [18,19]. Details of the preparation condition of TIPS pentacene solution have been described elsewhere [13].…”

Section: Methodsmentioning

confidence: 99%

Organic field-effect transistors based on single-crystalline active layer and top-gate insulator consistently fabricated by electrostatic spray deposition

Onojima

Takahashi

Saito

2015

Organic Electronics

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“…Since organic devices can be fabricated by the solution process [1,2], organic image sensors have been interested for image sensing applications [3][4][5][6]. This is because several organic materials have special advantages over inorganic materials, such as the selective absorption band at the visible wavelength region, the high absorption coefficient, and the possibility of the roll-to-roll printing process [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Solution-Processed Green-Sensitive Organic Photoconductive Device Using Rhodamine 6G

Fukuda

Kimura

Honda

et al. 2012

Molecular Crystals and Liquid Crystals

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Since rhodamine 6G (R6G) has the selective absorption band at the green wavelength regions, the green-sensitive organic photoconductive device was demonstrated using R6G as a photoconductive layer. By optimizing the conductivity of poly (3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) used as the carrier transport layer and the concentration of R6G, the maximum external quantum efficiency of 32.6% was obtained at the electric field of −34 MV/m. We found that the low-conductivity of the PEDOT:PSS layer was most important factor for the improved device performance. In addition, the signal-to-noise ratio (photocurrent/dark current) was improved by reducing the conductivity of the PEDOT:PSS layer, and the highest value of 60 was achieved.

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Surface morphology of fluorene thin film fabricated by electrospray deposition technique using two organic solvents: Application for organic light-emitting diodes

Cited by 43 publications

References 35 publications

Design and morphology control of a thiophene derivative through electrospraying using various solvents

Design and morphology control of a thiophene derivative through electrospraying using various solvents

Organic field-effect transistors based on single-crystalline active layer and top-gate insulator consistently fabricated by electrostatic spray deposition

Solution-Processed Green-Sensitive Organic Photoconductive Device Using Rhodamine 6G

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