Journalartikel

Jahr der Veröffentlichung: 2004

Seiten: 237-249

Zeitschrift: Organic Electronics

Bandnummer: 5

Heftnummer: 5

ISSN: 1566-1199

eISSN: 1878-5530

DOI Link: https://doi.org/10.1016/j.orgel.2004.02.003

Verlag: Elsevier

Abstract: 
Thin films of 1,6,7,12-tetrachloro-N,N-'-dimethylperylene-3,4,9,10-biscarboximide (Cl4MePTCDI) prepared by physical vapor deposition (PVD) were compared to thin films of the unchlorinated N,N'-dimethylperylene-3,4,9,10-biscarboximide (MePTCDI) to investigate the influence of a changed molecular structure on the electrical properties of the materials. The films were prepared on microstructured Si/SiO2 substrates with interdigitated Au electrode arrays of 2 mum electrode distance or on quartz glass with electrode distances in the mm range. The films were investigated by conductance measurements, thermoelectric power, electric field effect, ultraviolet photoelectron spectroscopy (UPS) and atomic force microscopy (AFM). The thickness-dependence of the conductance measured during film growth (in situ) indicated a growth mode in islands (Volmer-Weber), which was confirmed by subsequent AFM. As expected, Cl4MePTCDI was characterized as an organic n-type semiconductor. Charge transport occurred by a hopping mechanism as revealed by temperature-dependent thermopower and field-effect measurements. Effective electron mobilities at room temperature were found around 10(-5) cm(2) V-1 s(-1) considerably lower than the values for MePTCDI. A rather constant concentration of mobile electrons of (1-2)x10(18) cm(-3) was determined for both materials. The morphology of Cl4MePTCDI islands indicated amorphous growth as opposed to crystals obtained for MePTCDI, as also revealed earlier by optical spectroscopy and the role of crystallinity in the electrical conduction is discussed. (C) 2004 Elsevier B.V. All rights reserved.

Harvard-Zitierstil: Graaf, H., Michaelis, W., Schnurpfeil, G., Jaeger, N. and Schlettwein, D. (2004) Consequences of twisting the aromatic core of N,N′-dimethylperylene-3,4,9,10-biscarboximide by chemical substitution for the electronic coupling and electric transport in thin films, Organic Electronics, 5(5), pp. 237-249. https://doi.org/10.1016/j.orgel.2004.02.003

APA-Zitierstil: Graaf, H., Michaelis, W., Schnurpfeil, G., Jaeger, N., & Schlettwein, D. (2004). Consequences of twisting the aromatic core of N,N′-dimethylperylene-3,4,9,10-biscarboximide by chemical substitution for the electronic coupling and electric transport in thin films. Organic Electronics. 5(5), 237-249. https://doi.org/10.1016/j.orgel.2004.02.003