Influence of intramolecular vibrations in charge redistribution at the pentacene-graphite interface

被引：11

作者：

Fujii, Kuniharu ^{[1
]}

Kera, Satoshi ^{[1
]}

Oiwa, Mika ^{[1
]}

Okudaira, Koji K. ^{[1
]}

Sakamoto, Kazuyuki ^{[1
]}

Ueno, Nobuo ^{[1
]}

机构：

[1] Chiba Univ, Grad Sch Sci & Technol, Inage Ku, Chiba 2638522, Japan

来源：

SURFACE SCIENCE | 2007年 / 601卷 / 18期

关键词：

high-resolution electron-energy-loss-spectroscopy; interface; pentacene; graphite; vibrational spectroscopy; organic semiconductor;

D O I：

10.1016/j.susc.2007.04.027

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We have investigated the relation between the intramolecular vibrational modes of pentacene and the charge redistribution at the pentacene-graphite interface by using high-resolution electron-energy-loss-spectroscopy. The three main vibrational peaks shift to lower energies as the pentacene film thickness decreases. In order to discuss this energy shift, we have calculated the vibrational energies of a free pentacene molecule by changing its charge state. We have also calculated the vibrational energies of a pentacene molecule adsorbed on a graphite sheet by changing the pentacene-graphite distance. Taking the experimental and calculation results into account, we conclude that the observed energy shifts result from an intramolecular charge redistribution. The present results indicate that the effect of an intramolecular charge redistribution is essential to discuss the origin of an energy shift observed in a vibrational study of an organic molecule/substrate interface. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：3765 / 3768

页数：4

共 13 条

[1] Charge-transfer and energy-transfer processes in π-conjugated oligomers and polymers:: A molecular picture [J].

Brédas, JL ;

Beljonne, D ;

Coropceanu, V ;

Cornil, J .

CHEMICAL REVIEWS, 2004, 104 (11) :4971-5003

[2] Hole- and electron-vibrational couplings in oligoacene crystals:: Intramolecular contributions -: art. no. 275503 [J].

Coropceanu, V ;

Malagoli, M ;

da Silva, DA ;

Gruhn, NE ;

Bill, TG ;

Brédas, JL .

PHYSICAL REVIEW LETTERS, 2002, 89 (27) :275503-275503

[3] Vibronic coupling in the ground and excited states of the naphthalene cation [J].

da Silva, DA ;

Friedlein, R ;

Coropceanu, V ;

Öhrwall, G ;

Osikowicz, W ;

Suess, C ;

Sorensen, SL ;

Svensson, S ;

Salaneck, WR ;

Brédas, JL .

CHEMICAL COMMUNICATIONS, 2004, (15) :1702-1703

[4] Polycyclic aromates on close-packed metal surfaces: functionalization, molecular chemisorption and organic epitaxy [J].

Eremtchenko, M ;

Bauer, D ;

Schaefer, JA ;

Tautz, FS .

NEW JOURNAL OF PHYSICS, 2004, 6

[5] Understanding and tuning the epitaxy of large aromatic adsorbates by molecular design [J].

Eremtchenko, M ;

Schaefer, JA ;

Tautz, FS .

NATURE, 2003, 425 (6958) :602-605

[6] Formation of molecular order on a disordered interface layer: Pentacene/Ag(111) [J].

Eremtchenko, M ;

Temirov, R ;

Bauer, D ;

Schaefer, JA ;

Tautz, FS .

PHYSICAL REVIEW B, 2005, 72 (11)

[7]

Frisch M. J., 2004, GAUSSIAN 03

[8] Origin of the highest occupied band position in pentacene films from ultraviolet photoelectron spectroscopy: Hole stabilization versus band dispersion [J].

Fukagawa, H. ;

Yamane, H. ;

Kataoka, T. ;

Kera, S. ;

Nakamura, M. ;

Kudo, K. ;

Ueno, N. .

PHYSICAL REVIEW B, 2006, 73 (24)

[9] Thickness dependence of the LUMO position for phthalocyanines on hydrogen passivated silicon (111) [J].

Gorgoi, M ;

Michaelis, W ;

Kampen, TU ;

Schlettwein, D ;

Zahn, DRT .

APPLIED SURFACE SCIENCE, 2004, 234 (1-4) :138-143

[10] Electronic structure of organic interfaces - a case study on perylene derivatives [J].

Kampen, TU .

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 2006, 82 (03) :457-470

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