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首页> 外文期刊>Physical review. B, Condensed Matter And Materials Physics >Growth of pentacene on clean and modified gold surfaces
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Growth of pentacene on clean and modified gold surfaces

机译：并五苯在清洁和改性的金表面上的生长

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The growth and evolution of pentacene films on gold substrates have been studied. By combining complementary techniques including scanning tunneling microscopy, atomic force microscopy, scanning electron microscopy, near-edge x-ray-absorption fine structure, and x-ray diffraction, the molecular orientation, crystalline structure, and morphology of the organic films were characterized as a function of film thickness and growth parameters (temperature and rate) for different gold substrates ranging from Au(111) single crystals to polycrystalline gold. Moreover, the influence of precoating the various gold substrates with self-assembled monolayers (SAM's) of organothiols with different chemical terminations has been studied. On bare gold the growth of pentacene films is characterized by a pronounced dewetting while the molecular orientation within the resulting crystalline three-dimensional islands depends distinctly on the roughness and cleanliness of the substrate surface. After completion of the first wetting layer where molecules adopt a planar orientation parallel to the surface the molecules continue to grow in a tilted fashion: on Au(111) the long molecular axis is oriented parallel to the surface while on polycrystalline gold it is upstanding oriented and thus parallels the crystalline orientation of pentacene films grown on SiO_2. On SAM preheated gold substrates the formation of a wetting layer is effectively suppressed and pentacene grows in a quasi-layer-by-layer fashion with an upstanding orientation leading to rather smooth films. The latter growth mode is observed independently of the chemical termination of the SAM's and the roughness of the gold substrate. Possible reasons for the different growth mechanism as well as consequences for the assignment of spectroscopic data of thin pentacene film are discussed.
机译：研究了并五苯薄膜在金基底上的生长和演化。通过结合扫描隧道显微镜，原子力显微镜，扫描电子显微镜，近边缘X射线吸收精细结构和X射线衍射等辅助技术，将有机膜的分子取向，晶体结构和形态表征为从Au（111）单晶到多晶金的不同金衬底的膜厚度和生长参数（温度和速率）的函数。此外，研究了用具有不同化学末端的有机硫醇的自组装单层（SAM's）预涂各种金基底的影响。在裸金上，并五苯薄膜的生长以明显的去湿为特征，而所得晶体三维岛中的分子取向则明显取决于基底表面的粗糙度和清洁度。在第一个润湿层完成后，分子采用平行于表面的平面取向，分子继续以倾斜的方式生长：在Au（111）上，长分子轴与表面平行，而在多晶金上，分子呈直立取向因此平行于在SiO_2上生长的并五苯薄膜的晶体取向。在SAM预热的金基材上，湿润层的形成得到有效抑制，并五苯以准分层的方式逐层生长，且直立的取向导致薄膜非常光滑。观察到后一种生长模式，而与SAM的化学终止和金基底的粗糙度无关。讨论了并五苯薄膜薄膜增长机理不同的可能原因以及分配光谱数据的后果。

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