Topic
Photoemission spectroscopy
About: Photoemission spectroscopy is a research topic. Over the lifetime, 10821 publications have been published within this topic receiving 250888 citations. The topic is also known as: photoelectron spectroscopy & PES.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, the electronic structures and work functions of pristine and Cs-intercalated single-walled carbon nanotube bundles were investigated using ultraviolet photoemission spectroscopy.
Abstract: The electronic structures and the work functions of pristine and Cs-intercalated single-walled carbon nanotube bundles were investigated using ultraviolet photoemission spectroscopy. The valence bands of the pristine bundles were considerably altered from those of graphite. A spectral shift to the higher binding energy side was observed in the Cs-intercalated sample. The work function of the pristine bundles was found to be 4.8 eV, which is 0.1–0.2 eV larger than that of graphite. A drastic decrease of the work function to about 2.4 eV was observed in the Cs-intercalated sample.
365 citations
TL;DR: In this paper, the authors developed an electronic structure and d-band center control engineering for accelerating the hydrogen evolution reaction (HER) through water splitting, which was synthesized by a self-templating transformation strategy.
365 citations
TL;DR: In this article, the relationship between the observed behavior of photoemission energy distributions vs frequency, angle, etc., and the quantum theory of photo-emission as recently set forth formally by Caroli et al. is described.
Abstract: We describe the relation between the observed behavior of photoemission energy distributions vs frequency, angle, etc., and the quantum theory of photoemission as recently set forth formally by Caroli et al. We derive a Fermi's Golden-Rule formula for the angle- and energy-resolved photocurrent from an independent electron solid, and show in detail the approximations which render this formula equivalent to that of the familiar three-step model of bulk photoemission. In terms of the Golden-Rule formula, we account for the direct-transition band-structure regime generally observed at low photon energies (hν≲20−30 eV) and the "photoemission density of states", or x-ray-photoemission-spectroscopy regime, observed at higher energies. We also propose an explanation of Feuerbacher et al.'s observation of "direct photoemission into the vacuum" from single-crystal tungsten surfaces. Finally, we discuss the criteria which determine the relative magnitudes of photocurrents from a surface adsorbate layer and an underlying substrate.
364 citations
TL;DR: It is found that the lattice contracts and the d charge at the Au atom site depletes relative to bulk Au as the size of the NP decreases, suggesting the interplay of quantum-size and surface effect.
Abstract: We report a study of the structure and electronic properties of a series of thiol-capped Au nanoparticles (NP) of nominal sizes of 1.6, 2.4, and 4.0 nm. Transmission electron microscopy, x-ray powder diffraction, x-ray absorption fine structure, and x-ray photoemission spectroscopy have been used to investigate the size-dependent systematics of lattice contraction and charge redistribution of these NPs. It is found that the lattice contracts and the d charge at the Au atom site depletes relative to bulk Au as the size of the NP decreases. The implication of these observations is discussed in terms of the interplay of quantum-size and surface effect.
355 citations
TL;DR: In this paper, a thermally evaporated surface layer of metallic Li is found to diffuse through, and subsequently dope, the electron transporting organic semiconducting thin films immediately below the cathode, forming an Ohmic contact.
Abstract: We study the effects of lithium (Li) incorporation in the cathodes of organic light-emitting devices. A thermally evaporated surface layer of metallic Li is found to diffuse through, and subsequently dope, the electron transporting organic semiconducting thin films immediately below the cathode, forming an Ohmic contact. A diffusion length of ∼700 A is inferred from analyses of the current–voltage and secondary ion mass spectrometry data. The conductivity of the Li-doped organic films is ∼3×10−5 S/cm. Photoemission spectroscopy suggests that Li lowers the barrier to injection at the organic/cathode interface, introduces gap states in the bulk of the organic semiconductor, and dopes the bulk to facilitate efficient charge transport.
347 citations