Reversibility of temperature driven discrete layer-by-layer formation of dioctyl-benzothieno-benzothiophene films

M Dohr, H M A Ehmann, A O F Jones, I Salzmann, Q Shen, C Teichert, C Ruzié, G Schweicher, Y H Geerts, R Resel, M Sferrazza, O Werzer

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

Abstract

Film forming properties of semiconducting organic molecules comprising alkyl-chains combined with an aromatic unit have a decisive impact on possible applications in organic electronics. In particular, knowledge on the film formation process in terms of wetting or dewetting, and the precise control of these processes, is of high importance. In the present work, the subtle effect of temperature on the morphology and structure of dioctyl[1]benzothieno[3,2-b][1]benzothiophene (C8-BTBT) films deposited on silica surfaces by spin coating is investigated in situ via X-ray diffraction techniques and atomic force microscopy. Depending on temperature, bulk C8-BTBT exhibits a crystalline, a smectic A and an isotropic phase. Heating of thin C8-BTBT layers at temperatures below the smectic phase transition temperature leads to a strong dewetting of the films. Upon approaching the smectic phase transition, the molecules start to rewet the surface in the form of discrete monolayers with a defined number of monolayers being present at a given temperature. The wetting process and layer formation is well defined and thermally stable at a given temperature. On cooling the reverse effect is observed and dewetting occurs. This demonstrates the full reversibility of the film formation behavior and reveals that the layering process is defined by an equilibrium thermodynamic state, rather than by kinetic effects.

Originalspracheenglisch
Seiten (von - bis)2322-2329
Seitenumfang8
FachzeitschriftSoft matter
Jahrgang13
Ausgabenummer12
DOIs
PublikationsstatusVeröffentlicht - 22 Mär 2017

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drying
wetting
Wetting
Monolayers
Temperature
Phase transitions
temperature
Molecules
Spin coating
thermodynamic equilibrium
Silicon Dioxide
coating
molecules
Atomic force microscopy
Electronic equipment
transition temperature
benzothiophene
atomic force microscopy
Thermodynamics
silicon dioxide

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    Dohr, M., Ehmann, H. M. A., Jones, A. O. F., Salzmann, I., Shen, Q., Teichert, C., ... Werzer, O. (2017). Reversibility of temperature driven discrete layer-by-layer formation of dioctyl-benzothieno-benzothiophene films. Soft matter, 13(12), 2322-2329. https://doi.org/10.1039/c6sm02541b

    Reversibility of temperature driven discrete layer-by-layer formation of dioctyl-benzothieno-benzothiophene films. / Dohr, M; Ehmann, H M A; Jones, A O F; Salzmann, I; Shen, Q; Teichert, C; Ruzié, C; Schweicher, G; Geerts, Y H; Resel, R; Sferrazza, M; Werzer, O.

    in: Soft matter, Jahrgang 13, Nr. 12, 22.03.2017, S. 2322-2329.

    Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

    Dohr, M, Ehmann, HMA, Jones, AOF, Salzmann, I, Shen, Q, Teichert, C, Ruzié, C, Schweicher, G, Geerts, YH, Resel, R, Sferrazza, M & Werzer, O 2017, 'Reversibility of temperature driven discrete layer-by-layer formation of dioctyl-benzothieno-benzothiophene films' Soft matter, Jg. 13, Nr. 12, S. 2322-2329. https://doi.org/10.1039/c6sm02541b
    Dohr, M ; Ehmann, H M A ; Jones, A O F ; Salzmann, I ; Shen, Q ; Teichert, C ; Ruzié, C ; Schweicher, G ; Geerts, Y H ; Resel, R ; Sferrazza, M ; Werzer, O. / Reversibility of temperature driven discrete layer-by-layer formation of dioctyl-benzothieno-benzothiophene films. in: Soft matter. 2017 ; Jahrgang 13, Nr. 12. S. 2322-2329.
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