Evidence for efficient screening in organic materials

被引：17

作者：

Casu, M. B. ^{[1
]}

机构：

[1] Univ Tubingen, Inst Phys & Theoret Chem, D-72076 Tubingen, Germany

来源：

PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS | 2008年 / 2卷 / 01期

关键词：

D O I：

10.1002/pssr.200701270

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present highly resolved X-ray photoemission measurements performed in order to investigate surface core level shifts (SCLS) on various different organic systems: PTCDA, coronene, and metal free phthalocyanine. C Is spectra evidence the absence of SCLS in organic thin films. We explained these results in terms of very efficient screening. If the molecular interaction is sufficiently strong, the screening of the created charge by delocalisation is quite efficient. SCLS absence in organic materials implies that polarisation energies are much lower than usually assumed. (C) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

引用

页码：40 / 42

页数：3

共 16 条

[1] HOLE LIFETIME AND CHEMICAL-SHIFT OF THE 4F LEVELS IN YB METAL [J].

ALVARADO, SF ;

CAMPAGNA, M ;

GUDAT, W .

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, 1980, 18 (1-2) :43-49

[2] Electronic correlations in oligo-acene and -thiopene organic molecular crystals [J].

Brocks, G ;

van den Brink, J ;

Morpurgo, AF .

PHYSICAL REVIEW LETTERS, 2004, 93 (14) :146405-1

[3]

BUCHBERGER C, 2001, THESIS U WURZBURG

[4] Investigation of polarization effects in organic thin films by surface core-level shifts [J].

Casu, M. B. ;

Zou, Y. ;

Kera, S. ;

Batchelor, D. ;

Schmidt, Th. ;

Umbach, E. .

PHYSICAL REVIEW B, 2007, 76 (19)

[5]

EASTMAN DE, 1980, PHYS REV LETT, V45, P656, DOI 10.1103/PhysRevLett.45.656

[6] CORE-LEVEL BINDING-ENERGY SHIFTS AT SURFACES AND IN SOLIDS [J].

Egelhoff, W. F., Jr. .

SURFACE SCIENCE REPORTS, 1987, 6 (6-8) :253-415

[7]

HUBNER D, UNPUB

[8] Lowest optical excitations in molecular crystals: Bound excitons versus free electron-hole pairs in anthracene [J].

Hummer, K ;

Puschnig, P ;

Ambrosch-Draxl, C .

PHYSICAL REVIEW LETTERS, 2004, 92 (14) :147402-1

[9]

JOHNSSON B, 1980, PHYS REV B, V21, P4427

[10] Growth mode and molecular orientation of phthalocyanine molecules on metal single crystal substrates: A NEXAFS and XPS study [J].

Kera, S ;

Casu, MB ;

Bauchspiess, KR ;

Batchelor, D ;

Schmidt, T ;

Umbach, E .

SURFACE SCIENCE, 2006, 600 (05) :1077-1084

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