Publication

Surface characterization of metallic molecular organic thin films: tetrathiafulvalene tetracyanoquinodimethane

Marco Grioni
2001
Journal Articles

Abstract

The electronic structure of ex situ grown highly oriented thin films of the quasi-ID organic metal tetrathiafulvalene tetracyanoquinodimethane (TTF-TCNQ) has been characterized by means of temperature-dependent high-resolution angle-resolved photoemission spectroscopy and X-ray photoelectron spectroscopy. Band dispersion near the Fermi level (EF) is observed at low temperatures (similar to 100 K) for as-received samples. At room temperature both charged and neutral TCNQ species (TCNQ(-) and TCNQ(0), respectively) coexist at the surface. The presence of TCNQ(0), partly due to surface thermal vibrations. is reduced at lower temperatures because of the smaller surface oscillation amplitudes. (C) 2001 Elsevier Science B.V. All rights reserved.

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https://infoscience.epfl.ch/entities/publication/51355f29-72c0-4c22-9cb4-cc7fc19db7c5

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Marco Grioni
2001
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/51355f29-72c0-4c22-9cb4-cc7fc19db7c5

About this result

Related concepts (26)

X-ray photoelectron spectroscopy

X-ray photoelectron spectroscopy (XPS) is a surface-sensitive quantitative spectroscopic technique based on the photoelectric effect that can identify the elements that exist within a material (elemental composition) or are covering its surface, as well as their chemical state, and the overall electronic structure and density of the electronic states in the material. XPS is a powerful measurement technique because it not only shows what elements are present, but also what other elements they are bonded to.

Photoemission spectroscopy

Photoemission spectroscopy (PES), also known as photoelectron spectroscopy, refers to energy measurement of electrons emitted from solids, gases or liquids by the photoelectric effect, in order to determine the binding energies of electrons in the substance. The term refers to various techniques, depending on whether the ionization energy is provided by X-ray, XUV or UV photons. Regardless of the incident photon beam, however, all photoelectron spectroscopy revolves around the general theme of surface analysis by measuring the ejected electrons.

Room temperature

Colloquially, room temperature is a range of air temperatures that most people prefer for indoor settings. These temperatures feel comfortable to people wearing typical indoor clothing. Human comfort can extend beyond this range depending on humidity, air circulation and other factors. In certain fields, like science and engineering, and within a particular context, room temperature can mean different agreed-upon ranges. In contrast, ambient temperature is the actual temperature, as measured by a thermometer, of the air (or other medium and surroundings) in any particular place.

Related publications (20)

Surface characterization of metallic molecular organic thin films: tetrathiafulvalene tetracyanoquinodimethane

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