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Key role of molecular kinetic energy in early stages of pentacene island growth (Articolo in rivista)

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Key role of molecular kinetic energy in early stages of pentacene island growth (Articolo in rivista) (literal)

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Wu Y. (1); Toccoli T. (2); Zhang J. (3); Koch N. (3); Iacob E. (4); Pallaoro A. (2); Iannotta S. (2)(5); Rudolf P. (1) (2009)
Key role of molecular kinetic energy in early stages of pentacene island growth
in Applied physics. A, Materials science & processing (Print); SPRINGER, 233 SPRING ST, NEW YORK, NY 10013 (Stati Uniti d'America)
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Wu Y. (1); Toccoli T. (2); Zhang J. (3); Koch N. (3); Iacob E. (4); Pallaoro A. (2); Iannotta S. (2)(5); Rudolf P. (1) (literal)

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In: Applied Physics A-Materials Science & Processing, vol. 95 (1) pp. 21 - 27. Springer-Verlag, 2009. (literal)

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1. Univ Groningen, Zernike Inst Adv Mat, NL-9749 AG Groningen, Netherlands 2. Inst Photon & Nanotechnol, FBK, CEFSA, IFN,CNR, I-38050 Povo, Trento, Italy 3. Humboldt Univ, Inst Phys, D-12489 Berlin, Germany 4. FBK Mat & Microsyst, I-38050 Povo, Trento, Italy 5. CNR, IMEM, I-43100 Parma, Italy (literal)

Titolo

Key role of molecular kinetic energy in early stages of pentacene island growth (literal)

Abstract

Organic molecular beam deposition is studied systematically at thermal and hyperthermal regimes aiming at investigating the role of molecular kinetic energy on the growth mechanism of pentacene submonolayers on SiOx/Si. We show that the kinetic energy of the impinging molecule (Ek) plays a crucial role in determining island structure and shape, distribution of island sizes, the crystalline quality of the first monolayer, and even the growth mode of subsequent layers. With increasing Ek, the island structure changes from fractal to nonfractal, the shape becomes more anisotropic and the island size more uniform, pointing to correlated island growth. Moreover, while 3D island growth is observed for thermal organic molecular beam deposition, supersonic molecular beam deposition gives rise to layer-by-layer growth, at least for the first two layers. When Ek≥5.0 eV, the first monolayer is composed of large single crystalline domains which can extend over up to 10 mu m, inferred from comparing atomic force micrographs of height and net transverse shear force. In these growth conditions both the high surface diffusivity and energy redistribution play a major role. We propose a mechanism where the energy dissipation occurring during the molecule-surface collision leads to the reorientation of whole islands during island coalescence, resulting in the elimination of grain boundaries. (literal)

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