Eccher, Juliana ; Faria, Gregório C. ; Bock, Harald ; Seggern, Heinz von ; Bechtold, Ivan H. (2013)
Order Induced Charge Carrier Mobility Enhancement in Columnar Liquid Crystal Diodes.
In: ACS Applied Materials & Interfaces, 5 (22)
doi: 10.1021/am403681q
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Discotic molecules comprising a rigid aromatic core and flexible side chains have been promisingly applied in OLEDs as self-organizing organic semiconductors. Due to their potentially high charge carrier mobility along the columns, device performance can be readily improved by proper alignment of columns throughout the bulk. In the present work, the charge mobility was increased by 5 orders of magnitude due to homeotropic columnar ordering induced by the boundary interfaces during thermal annealing in the mesophase. State-of-the-art diodes were fabricated using spin-coated films whose homeotropic alignment with formation of hexagonal germs was observed by polarizing optical microscopy. The photophysical properties showed drastic changes at the mesophase-isotropic transition, which is supported by the gain of order observed by X-ray diffraction. The electrical properties were investigated by modeling the current-voltage characteristics by a space-charge-limited current transport with a field dependent mobility.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2013 |
| Autor(en): | Eccher, Juliana ; Faria, Gregório C. ; Bock, Harald ; Seggern, Heinz von ; Bechtold, Ivan H. |
| Art des Eintrags: | Bibliographie |
| Titel: | Order Induced Charge Carrier Mobility Enhancement in Columnar Liquid Crystal Diodes |
| Sprache: | Englisch |
| Publikationsjahr: | 27 November 2013 |
| Verlag: | American Chemical Society |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | ACS Applied Materials & Interfaces |
| Jahrgang/Volume einer Zeitschrift: | 5 |
| (Heft-)Nummer: | 22 |
| DOI: | 10.1021/am403681q |
| Kurzbeschreibung (Abstract): | Discotic molecules comprising a rigid aromatic core and flexible side chains have been promisingly applied in OLEDs as self-organizing organic semiconductors. Due to their potentially high charge carrier mobility along the columns, device performance can be readily improved by proper alignment of columns throughout the bulk. In the present work, the charge mobility was increased by 5 orders of magnitude due to homeotropic columnar ordering induced by the boundary interfaces during thermal annealing in the mesophase. State-of-the-art diodes were fabricated using spin-coated films whose homeotropic alignment with formation of hexagonal germs was observed by polarizing optical microscopy. The photophysical properties showed drastic changes at the mesophase-isotropic transition, which is supported by the gain of order observed by X-ray diffraction. The electrical properties were investigated by modeling the current-voltage characteristics by a space-charge-limited current transport with a field dependent mobility. |
| Freie Schlagworte: | organic electronics, charge carrier mobility, columnar liquid crystals, perylenediimide, homeotropic alignment, interface effect |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Elektronische Materialeigenschaften |
| Hinterlegungsdatum: | 15 Mai 2017 09:24 |
| Letzte Änderung: | 13 Aug 2021 14:08 |
| PPN: | |
| Sponsoren: | The authors thank the following institutions for financial support: CAPES, CNPq, and INCT/INEO., G.C.F. acknowledges the fellowship by the "Fundacao de Amparo a Pesquisa do Estado de Sao Paulo" (FAPESP) (Proc-number 2008/01935-5 and 2012/01303-4) and by the "Deutscher Akademischer Austauschdienst" (DAAD) (A/09/72945; ref 415)., H.v.S. acknowledges the scholarship "Special Visiting Researcher" by the Brazilian Science without Borders Program (CNPq and Capes Proc-number 400133/2012-1). |
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