Regensburg 2002 – wissenschaftliches Programm

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SYOH: Organische Halbleiter

SYOH 2: Growth and Characterisation

SYOH 2.4: Vortrag

Montag, 11. März 2002, 11:45–12:00, H37

Influence of Bay- Chlorination on Film Growth and Electrical Properties of N,N’-Dimethylperylene-3,4,9,10-biscarboximide — •Derck Schlettwein¹, Harald Graaf², Wilfried Michaelis¹, Guenter Schnurpfeil², and Nils I. Jaeger² — ¹Physical Chemistry 1, Univ. Oldenburg, Germany — ²Dept. of Chemistry, Univ. Bremen, Germany

Thin films of 1,6,7,12-Tetrachloro-N,N’-dimethylperylene-3,4,9,10-biscarboximide (Cl₄MePTCDI) were prepared by physical vapour deposition on microstructured Si/ SiO₂ substrates with interdigitated Au electrode arrays of 2 micrometer 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 and atomic force microscopy. From the thickness-dependence of the conductance measured during film growth, a growth mode in islands was concluded. The material 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. Mobilities around 10⁻⁵ cm² V⁻¹ s⁻¹ were measured, dependent on the preparation conditions. A rather constant concentration of mobile electrons of 1 - 2 ×10¹⁸ cm⁻³ was determined under all conditions.