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DS: Dünne Schichten

DS 13: Internal Symposium “Nanoengineered thin films”

DS 13.4: Hauptvortrag

Mittwoch, 29. März 2006, 16:30–17:15, GER 37

From Nanostructured ZnO-Based Thin Films to Arrays of Free-Standing Nanowires: Self-Organized Growth by Pulsed Laser Deposition — •Michael Lorenz — Universität Leipzig, Institut für Experimentelle Physik II

Currently, the wide-bandgap material zinc oxide attracts considerable research interest in view of envisaged applications as fast scintillators, light emitting diodes, and UV lasers by taking advantage of efficient excitonic effects even at room temperature. Pulsed laser deposition (PLD) has proved to be a flexible and fast exploratory tool for the self-organized growth of ZnO-based, nanostructured thin films [1-2] and nanowire arrays [3-5]. The formation of nanosized grain structures in ZnO thin films that promote the outcoupling of luminescence light and determine electrical properties can be controlled via the background gas pressure in PLD. With further increasing gas pressure, arrays of free-standing ZnO-based nanowires can be grown reproducibly by PLD. This unique, high-pressure PLD process allows for a wide-range control of morphology, diameter, and composition of the nanowires and works successfully on various growth templates and in a wide temperature range. The PLD grown nanostructured thin films and nanowires show superior luminescence properties and are serving therefore as materials base for selected device demonstrations.

[1] E. M. Kaidashev, M. Lorenz et al., Appl. Phys. Lett. 82 (2003) 3901.

[2] M. Lorenz et al., Thin Solid Films 486 (2005) 205.

[3] M. Lorenz et al., Ann. Phys. (Leipzig) 13 (2004) 39.

[4] Th. Nobis et al., Phys. Rev. Lett. 93 (2004) 103903.

[5] M. Lorenz et al., Appl. Phys. Lett. 86 (2005) 143113.