Morphology and Current–Voltage Characteristics of Nanostructured Pentacene Thin Films Probed by Atomic Force Microscopy

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Abstract:

Atomic force microscopy was used to study the growth modes (on SiO2, MoS2, and Au substrates) and the current–voltage (I–V) characteristics of organic semiconductor pentacene. Pentacene films grow on SiO2 substrate in a layer-by-layer manner with full coverage at an average thickness of 20 Å and have the highest degree of molecular ordering with large dendritic grains among the pentacene films deposited on the three different substrates. Films grown on MoS2 substrate reveal two different growth modes, snowflake-like growth and granular growth, both of which seem to compete with each other. On the other hand, films deposited on Au substrate show granular structure for thinner coverages (no crystal structure) and dendritic growth for higher coverages (crystal structure). I–V measurements were performed with a platinum tip on a pentacene film deposited on a Au substrate. The I–V curves on pentacene film reveal symmetric tunneling type character. The field dependence of the current indicates that the main transport mechanism at high field intensities is hopping (Poole–Frenkel effect). From these measurements, we have estimated a field lowering coefficient of 9.77 × 10−6 V−1/2 m1/2 and an ideality factor of 18 for pentacene.

Keywords: ATOMIC FORCE MICROSCOPY; CP-AFM; CURRENT-VOLTAGE CHARACTERISTICS; GROWTH MODES; MORPHOLOGY; NANOSTRUCTURED PENTACENE FILM

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2001.050

Affiliations: Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA

Publication date: September 1, 2001

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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