3D island growth of 6,13 Pentacenequinone on silicon oxide and gold

Parisse, Pietro; Bussolotti, Fabio; Passacantando, M.; Ottaviano, L.

doi:10.1016/j.jnoncrysol.2010.05.071

Cited by 4 publications

(6 citation statements)

References 30 publications

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“…The spectra show that the thinner film has the high-wavenumber band due to the thin-film phase as a major component, whereas the low-wavenumber band corresponding to the bulk phase is the dominant component in the thicker film (Figure b). This observation agrees well with the analytical results by XRD , and supports the assignments proposed by Salzmann et al On the band assignments, the bulk phase of PQ is concluded to be included as a minute fraction in the present films.…”

Section: Resultssupporting

confidence: 93%

Monitoring of Crystallization Process in Solution-Processed Pentacene Thin Films by Chemical Conversion Reactions

et al. 2021

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Solution-processable organic semiconductors having bulky substituent groups on the π-conjugated skeleton are rapidly gaining attention for their potential applications to large-area electronics. While the substituent groups contribute to the good solubility in organic solvents, they give rise to hopping sites in a thin film, affecting adversely the charge-carrier transport. As an alternative material, a solvent-soluble precursor compound with thermally cleavable functional groups is promising, which can be converted by heat treatment into a thin film to generate the desired material consisting solely of conjugated systems. This precursor approach is practically applied to various thin-film-based devices. The overall process of the thin film growth, however, remains unrevealed. In the present study, solution-processed pentacene thin films are prepared from a thermally convertible precursor, and the structural evolution during the chemical conversion reaction has been revealed by a combination of cutting-edge analytical tools of two-dimensional X-ray diffraction (2D-GIXD) and p-polarized multiple-angle incidence resolution spectrometry (pMAIRS). The highlight is that pentacene is crystallized in a stepwise manner in the thermally converted films, which is substantially different from a typical growth process. In addition, influences of the oxidation reaction of pentacene on the molecular arrangement are also discussed quantitatively. This study provides a fundamental schematic of thin films grown by the precursor method.

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Section: Resultssupporting

confidence: 93%

Monitoring of Crystallization Process in Solution-Processed Pentacene Thin Films by Chemical Conversion Reactions

et al. 2021

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“…These morphological evidences confirm our recent x-ray photoemission spectroscopy (XPS) studies on the same system, which clearly pointed to the presence of a PQ wetting layer (followed by crystallite formation) on silicon oxide. 29 Noteworthy our findings are in contrast to what reported previously on the PQ growth onto SiO 2 /Si(100) by Salzmann et al, 7 which report a PQ initial stage of growth in a Vol-merÀWeber (VW) mode 19 with the direct formation of thinfilm phase PQ crystallites. 34 The growth into rectangular shaped crystallites takes place along with another type of crystallites with a specifically different shape.…”

Section: Resultscontrasting

confidence: 97%

“…1) is formed, then the second layer (B), which is typical of the PQ unit cell regardless the crystalline phase (see Fig. 29 for an identical substrate and similar thickness of the organic layer. This rationale of the growth mode does not significantly depend on the type of PQ crystalline phase, as the two phases differ only in the lattice parameters but share the same two (AB) layer growth mode per unit cell.…”

Section: Resultsmentioning

confidence: 99%

Bulk phase two dimensional chiral growth of 6, 13 Pentacenequinone on SiO2

Marco

Fioriti

Bisti

et al. 2011

Journal of Applied Physics

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“…In contrast, a unit cell with Z = 1 naturally means parallel molecular planes and axes in the whole crystal, which is uncommon for this kind of molecule. Note that our cell choice for the SIP follows the notation introduced in refs , , and with c as the long axis instead of b (SCP), and, therefore, the dominating SIP portion of the film (Figure a) exhibits a (001)-texture in contrast to the (020)-texture of the SCP. A closer inspection of the PQ-SCP ( Z = 2) reveals that the two PQ molecules in the unit cell exhibit their herringbone arrangement perpendicular to the (020)-planes, that is, the long axes of the PQ molecules in adjacent layers along the [010] fiber axis are not parallel.…”

Section: Resultsmentioning

confidence: 99%

“…For thin films, it was reported that PQ exhibits polymorphism in terms of a single-crystal polymorph (SCP) and a surface-induced polymorph (SIP) ,,,, obtained by vacuum deposition on the common OFET gate dielectric SiO x . Moreover, as a model for chemically impure PEN, it was shown that a low ratio PQ admixture to PEN via vacuum codeposition may lead to exclusive growth of PQ in the SIP, while the SCP is entirely suppressed .…”

Section: Introductionmentioning

confidence: 99%

Structure Solution of the 6,13-Pentacenequinone Surface-Induced Polymorph by Combining X-ray Diffraction Reciprocal-Space Mapping and Theoretical Structure Modeling

Salzmann

Nabok

Oehzelt

et al. 2011

Crystal Growth & Design

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Thin films of 6,13-pentacenequinone (PQ) on native silicon oxide (SiO x ) grown in a yet unsolved surface-induced thin-film polymorph were investigated by X-ray diffraction reciprocal-space mapping yielding triclinic unit-cell parameters of a = 4.69 A ˚, b = 5.99 A ˚, c = 13.45 A ˚, R = 77.8°, β = 84.1°, and γ = 81.1°. Most notably, this polymorph exhibits only one molecule per unit cell in contrast to the single crystal phase with two molecules per unit cell. Therefore, in contrast to the single crystal phase, PQ does not exhibit a herringbone arrangement in the substrate-induced thin-film polymorph. The orientation of the molecule within the unit cell was modeled via force field calculations yielding a reliable full structure solution. Being corroborated by a direct derivation from the experimental intensities, this procedure represents a reliable pathway for full structure solutions of thin-film polymorphs. The results allowed for comparative electronic structure calculations of the two PQ polymorphs, which demonstrate a significantly wider dispersion of the lowest unoccupied molecular orbital-derived band (conduction band) in the surface-induced phase, which might be beneficial for electron transport.

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3D island growth of 6,13 Pentacenequinone on silicon oxide and gold

Cited by 4 publications

References 30 publications

Monitoring of Crystallization Process in Solution-Processed Pentacene Thin Films by Chemical Conversion Reactions

Monitoring of Crystallization Process in Solution-Processed Pentacene Thin Films by Chemical Conversion Reactions

Bulk phase two dimensional chiral growth of 6, 13 Pentacenequinone on SiO2

Structure Solution of the 6,13-Pentacenequinone Surface-Induced Polymorph by Combining X-ray Diffraction Reciprocal-Space Mapping and Theoretical Structure Modeling

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