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.
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TL;DR: This experiment shows that XPCS can be performed in a wide time range and opens up a new opportunity for the study of the dynamics of nontransparent media.
Abstract: We have used an intense coherent x-ray beam and a real time digital autocorrelator to study the low frequency dynamics of colloidal palladium in glycerol by x-ray photon correlation spectroscopy (XPCS). The translational diffusion was studied in the q range from 1.5 3 1023 to 6 3 1023 A21 and in the temperature range from 279 to 293 K. The measured relaxation rates were proportional to q2 and inversely proportional to viscosity as expected for a translational diffusion process. This experiment shows that XPCS can be performed in a wide time range (1024 to 100 s) and opens up a new opportunity for the study of the dynamics of nontransparent media. [S0031-9007(96)01912-6]
82 citations
TL;DR: In this paper, the interface between the conjugated polymer poly(3-hexylthiophene) and Au was investigated using photo-emission spectroscopy, and the results indicated that the P3HT interface has a smaller hole injection barrier (0.59eV) than comparably structured oligothiophene contacts.
Abstract: The interface between the conjugated polymer poly(3-hexylthiophene) (P3HT) and Au was investigated using photoemission spectroscopy. Electrospray thin film deposition was used to deposit P3HT on a polycrystalline Au thin film in several steps without breaking the vacuum. In between deposition steps, x-ray photoemission spectroscopy and ultraviolet photoemission spectroscopy measurements were carried out. The resulting series of spectra allowed the determination of the orbital lineup at the interface. The results indicate that the P3HT interface has a smaller hole injection barrier (0.59eV) than comparably structured oligothiophene contacts.
82 citations
TL;DR: In this article, He I and He II spectra for the isoelectronic molecules CF2 and O3 were reported with the aid of semi-empirical molecular orbital calculations.
Abstract: He I and He II spectra are reported for the isoelectronic molecules CF2 and O3. New values are reported for the first and higher ionization potentials. The spectra are interpreted with the aid of semi-empirical molecular orbital calculations.
82 citations
TL;DR: In this paper, the authors followed the process of reconstruction of the \ensuremath{\alpha}-Pu surface into a ε-pu surface and showed that the localized $5f$ states yield a broad maximum at 1.6-eV binding energy.
Abstract: X-ray photoelectron spectroscopy and high-resolution ultraviolet photoelectron spectroscopy studies were performed on thin Pu layers and compared with the studies on bulk surfaces prepared at various temperatures. We followed the process of reconstruction of the \ensuremath{\alpha}-Pu surface into a \ensuremath{\delta}-Pu type. Its kinetics depends strongly on temperature. The electronic structure of Pu layers varies markedly with the thickness and the localization of the $5f$ states can be achieved in the case of ultrathin Pu layers deposited on Mg. The valence band displays for the majority of Pu systems three sharp features within the first eV below the Fermi energy, the position of which is fixed. The localized $5f$ states yield a broad maximum at 1.6-eV binding energy.
82 citations
TL;DR: It is found that the CH3NH3PbI3 film coated onto the substrate of poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS)/indium tin oxide (ITO) by a two-step method presents n-type semiconductor behavior, with a band gap and a valence band edge below the Fermi energy (EF).
Abstract: The electronic properties of interfaces formed between Au and organometal triiodide perovskite (CH3NH3PbI3) are investigated using ultraviolet photoemission spectroscopy (UPS), inverse photoemission spectroscopy (IPES) and X-ray photoemission spectroscopy (XPS). It is found that the CH3NH3PbI3 film coated onto the substrate of poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS)/indium tin oxide (ITO) by a two-step method presents n-type semiconductor behavior, with a band gap of 1.7 eV and a valence band (VB) edge of 1.0 eV below the Fermi energy (EF). An interface dipole of 0.1 eV is observed at the CH3NH3PbI3/Au interface. The energy levels of CH3NH3PbI3 shift upward by ca. 0.4 eV with an Au coverage of 64 A upon it, resulting in band bending, hence a built-in field in CH3NH3PbI3 that encourages hole transport to the interface. Hole accumulation occurs in the vicinity of the interface, facilitating the hole transfer from CH3NH3PbI3 to Au. Furthermore, the shift of the VB maximum of CH3NH3PbI3 toward the EF indicates a decrease of energy loss as holes transfer from CH3NH3PbI3 to Au.
82 citations