### Pentacene multilayers on Ag(111) surfacePentacene multilayers on Ag(111) surface

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 Author Mete, Ersen ♦ Demiroglu, Ilker ♦ Danisman, M. Fatih ♦ Ellialtioglu, Sinasi Source arXiv.org Content type Text File Format PDF Date of Submission 2009-12-31 Language English
 Subject Domain (in DDC) Computer science, information & general works ♦ Natural sciences & mathematics ♦ Physics Subject Keyword Condensed Matter - Materials Science ♦ physics:cond-mat Abstract The structural profiles and electronic properties of pentacene (C$_{22}$H$_{14}$) multilayers on Ag(111) surface has been studied within the density functional theory (DFT) framework. We have performed first-principle total energy calculations based on the projector augmented wave (PAW) method to investigate the initial growth patterns of pentacene (Pn) on Ag(111) surface. In its bulk phase, pentacene crystallizes with a triclinic symmetry while a thin film phase having an orthorhombic unit cell is energetically less favorable by 0.12 eV/cell. Pentacene prefers to stay planar on Ag(111) surface and aligns perfectly along silver rows without any molecular deformation at a height of 3.9 {\AA}. At one monolayer (ML) coverage the separation between the molecular layer and the surface plane extends to 4.1 {\AA} due to intermolecular interactions weakening surface--pentacene attraction. While the first ML remains flat, the molecules on a second full pentacene layer deposited on the surface rearrange so that they become skewed with respect to each other. This adsorption mode is energetically more preferable than the one for which the molecules form a flat pentacene layer by an energy difference similar to that obtained for bulk and thin film phases. Moreover, as new layers added, pentacenes assemble to maintain this tilting for 3 and 4 ML similar to its bulk phase while the contact layer always remains planar. Therefore, our calculations indicate bulk-like initial stages for the growth pattern. Description Reference: J. Phys. Chem. C, 2010, 114 (6), pp 2724-2729 Educational Use Research Learning Resource Type Article Page Count 21