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首页> 外文期刊>Physical review >STM studies of thin PTCDA films on Ag/Si(111)-3~(1/2) × 3~(1/2)
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STM studies of thin PTCDA films on Ag/Si(111)-3~(1/2) × 3~(1/2)

机译：在Ag / Si（111）-3〜（1/2）×3〜（1/2）上PTCDA薄膜的STM研究

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摘要

Thin films of the large planar organic molecule 3,4,9,10-perylene tetracarboxylic dianhydride on the Ag/Si(111)-3~(1/2) × 3~(1/2) surface have been studied by scanning tunneling microscopy. The coverage was between 0.3 and 10 monolayers. In submonolayers the molecules form two different phases with a commensurate relationship to the substrate: a herringbone phase and a square phase. Adsorption sites are determined for the square phase. Additional herringbone phases were also observed with other unit cell size or lower order in relation to the substrate. The molecules lie flat on the surface and form a full monolayer before multilayers are developed. Both the square and herringbone phases have been observed for the second layer. With more than 3 layers, islands were built up layer by layer in agreement with the a bulk phase. On top of the islands there was always a herringbone structure.
机译：通过扫描隧道研究了大型平面有机分子3,4,9,10-per四羧酸二酐在Ag / Si（111）-3〜（1/2）×3〜（1/2）表面上的薄膜。显微镜检查。覆盖范围是0.3到10个单层。在亚单层中，分子形成两个与底物成比例关系的不同相：人字形相和方相。确定方相的吸附位点。还观察到其他人字形相，相对于底物，其单位晶胞尺寸较小或较低。分子平放在表面上，并在形成多层之前形成完整的单层。对于第二层，已经观察到方相和人字形相。在3层以上的情况下，与体相相符，逐层建立了岛屿。在这些岛的顶部，总是有一个人字形结构。

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