کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5395597 1392250 2015 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Local electronic structure at organic-metal interface studied by UPS, MAES, and first-principles calculation
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Local electronic structure at organic-metal interface studied by UPS, MAES, and first-principles calculation
چکیده انگلیسی
Understanding and controlling local electronic structures at organic-metal interfaces are crucial for fabricating novel organic-based electronics, as in the case of heterojunctions in semiconductor devices. Here, we report recent studies of valence electronic states at organic-metal interfaces (especially those near the Fermi level of a metal substrate) by the combined analysis of ultraviolet photoemission spectroscopy (UPS), metastable atom electron spectroscopy (MAES), and first-principles calculations. New electronic states in the HOMO (highest occupied molecular orbital)-LUMO (lowest unoccupied molecular orbital) gap formed at an organic-metal interface are classified as a chemisorption-induced gap state (CIGS) and a complex-based gap state (CBGS). The CIGS is further characterized by an asymptotic feature of the metal wave function in the chemisorbed species. The CIGSs in alkanethiolates on Pt(1 1 1) and C60 on Pt(1 1 1) can be regarded as damping and propagating types, respectively. The CBGSs in K-doped dibenzopentacene (DBP) are composed of DBP-derived MOs and K sp states and distributed over the complex film. No metallic structures were found in the K1DBP and K3DBP phases, suggesting that they are Mott-Hubbard insulators due to strong electron correlation. The local electronic structures of a pentacene film bridged by Au electrodes under bias voltages were examined by an FET-like specimen. The pentacene-derived bands were steeply shifted at the positively biased electrode, reflecting the p-type character of the film.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electron Spectroscopy and Related Phenomena - Volume 204, Part A, 1 October 2015, Pages 68-74
نویسندگان
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