کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9595592 | 1507979 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synchrotron radiation photoemission studies of the pentacene-Ag/Si(1Â 1Â 1) â3Â ÃÂ â3 interface
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The interaction of monolayer coverages of pentacene with the â3Â ÃÂ â3 silver terminated Si(1Â 1Â 1) surface has been studies by high resolution core level and valence band photoemission spectroscopies. Core level Si 2p spectra reveal that there is only a very weak interaction between the pentacene and the underlying silicon, however, there is evidence of Fermi level movement. Valence band spectra acquired with both s and p polarised light indicate that for the surface coverages investigated, the molecular layers are oriented parallel to the plane of the surface. These results are in agreement with recent scanning tunneling microscopy (STM) studies which indicated that the pentacene molecules form highly ordered layers with the plane of the molecule parallel to the surface. Changes in the workfunction and Fermi level movements have been used to determine the energy level alignment at the interface. A 0.35Â eV interface dipole forms between the pentacene and the silver terminated Si(1Â 1Â 1) surface within a two monolayer deposition. Photoemission measurements of the energy level alignment at the interface reveal that there is almost no barrier to charge injection from the conduction band of the semiconductor to the lowest unoccupied molecular orbital (LUMO) of the pentacene molecule.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface Science - Volume 580, Issues 1â3, 10 April 2005, Pages 167-172
Journal: Surface Science - Volume 580, Issues 1â3, 10 April 2005, Pages 167-172
نویسندگان
G. Hughes, D. Carty, O. McDonald, A.A. Cafolla,