Epitaxially Grown Films of Standing and Lying Pentacene Molecules on Cu(110) Surfaces

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• 作者：Tatjana Djuric ; Thomas Ules ; Heinz-Georg Flesch ; Harald Plank ; Quan Shen ; Christian Teichert ; Roland Resel ; Michael G. Ramsey
• 刊名：Crystal Growth & Design
• 出版年：2011
• 出版时间：April 6, 2011
• 年：2011
• 卷：11
• 期：4
• 页码：1015-1020
• 全文大小：1000K
• 年卷期：v.11,no.4(April 6, 2011)
• ISSN：1528-7505

文摘

Here, it is shown that pentacene thin films (30 nm) with distinctively different crystallographic structures and molecular orientations can be grown under essentially identical growth conditions in UHV on clean Cu(110) surfaces. By X-ray diffraction, we show that the epitaxially oriented pentacene films crystallize either in the 鈥渢hin film鈥?phase with standing molecules or in the 鈥渟ingle crystal鈥?structure with molecules lying with their long axes parallel to the substrate. The morphology of the samples observed by atomic force microscopy shows an epitaxial alignment of pentacene crystallites, which corroborates the molecular orientation observed by X-ray diffraction pole figures. Low energy electron diffraction measurements reveal that these dissimilar growth behaviors are induced by subtle differences in the monolayer structures formed by slightly different preparation procedures.