Regensburg 2007 – wissenschaftliches Programm
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SYSE: Symposium Strain-Engineering for New Functional Structures
SYSE 1: Strain engineering in semiconductors
SYSE 1.4: Vortrag
Montag, 26. März 2007, 15:30–15:45, H1
Radial crystals and radial superlattices — •Christoph Deneke1, Ute Zschieschang1, Bärbel Krause2, Neng Yun Jin-Phillipp3, Cristian Mokuta2, Till Metzger2, Hagen Klauk1, and Oliver Schmidt1 — 1Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569 Stuttgart — 2ESRF, Boîte Postale 220, F-38043 Grenoble Cedex, France — 3Max-Planck-Institut für Metallforschung, Heisenbergstr. 3, 70569 Stuttgart
Recently, a new class of radial crystals and radial superlattices has been established by the roll-up of thin solid films on a substrate surface [1-3]. We investigate these structures by X-ray diffraction and diverse transmission electron microscopy techniques. Quite generally, the superlattices comprise alternating single crystalline and non-crystalline (or poly-crystalline) layers. For example, radial superlattices out of In(Ga)As/alkanethiolate [4] or InGaAs/metal films are created. Detailed cross-sectional TEM and (S)TEM studies reveal that neighboring windings in the superlattices are closely joined together and that in some cases the interfaces show no detectable contamination. These new types of hybrid periodically modulated heterostructures might find relevance in refined optics [4] or electronics [5] applications.
[1] Ch. Deneke et al., Appl. Phys. Lett. 84, 4475 (2004); [2] B. Krause et al., Phys. Rev. Lett. 96, 165502 (2006); [3] Ch. Deneke et al., Appl. Phys. Lett. (in press) [4] R. Songmuang et al., cond-mat/0611261 [5] O. G. Schmidt et al., IEEE J. Sel. Top. Quant. Electron. 8, 1025 (2002).