Direct detection of electron-hole pairs generated by chemical reactions on metal surfaces

被引：40

作者：

Nienhaus, H ^{[1
]}

Bergh, HS

Gergen, B

Majumdar, A

Weinberg, WH

McFarland, EW

机构：

[1] Gerhard Mercator Univ, Festkorperphys Lab, D-47048 Duisburg, Germany

[2] Univ Calif Santa Barbara, Dept Chem Engn, Santa Barbara, CA 93106 USA

[3] Univ Calif Berkeley, Dept Mech Engn, Berkeley, CA 94720 USA

来源：

SURFACE SCIENCE | 2000年 / 445卷 / 2-3期

基金：

美国国家科学基金会;

关键词：

chemisorption; electron-solid scattering and transmission - elastic; hydrogen; iron; metal-semiconductor non-magnetic thin film structures; oxygen; Schottky barrier; silver;

D O I：

10.1016/S0039-6028(99)01078-X

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：

Non-adiabatic energy dissipation during exothermic chemical reactions on metal surfaces occurs by creation of electron-hole pairs in the metal. The excited charge carriers have been directly detected using metal-silicon (Schottky) diodes with ultrathin metal films. The chemically created hot electrons travel ballistically through the metal film? traverse the Schottky barrier and are detected as a chemicurrent in the diode. Three examples are presented, i.e. the adsorption of atomic hydrogen on Ag and Fe and the chemisorption of molecular oxygen on Ag. The chemicurrent transients upon exposure are related to the kinetics of the surface reaction. The large difference in the detection efficiency between Ag/Si and Fe/Si diodes is attributed to different conditions at the metal/silicon interface. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：335 / 342

页数：8

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