22 research outputs found
In-gas-cell laser ionization spectroscopy in the vicinity of 100Sn: Magnetic moments and mean-square charge radii of N=50-54 Ag
In-gas-cell laser ionization spectroscopy studies on the neutron deficient
97-101Ag isotopes have been performed with the LISOL setup. Magnetic dipole
moments and mean-square charge radii have been determined for the first time
with the exception of 101Ag, which was found in good agreement with previous
experimental values. The reported results allow tentatively assigning the spin
of 97,99Ag to 9/2 and confirming the presence of an isomeric state in these two
isotopes, whose collapsed hyperfine structure suggests a spin of 1/2 . The
effect of the N=50 shell closure is not only manifested in the magnetic moments
but also in the evolution of the mean-square charge radii of the isotopes
investigated, in accordance with the spherical droplet model predictions
Early onset of ground-state deformation in the neutron-deficient polonium isotopes
In-source resonant ionization laser spectroscopy of the even- polonium
isotopes Po has been performed using the
to ( nm) transition in the polonium atom
(Po-I) at the CERN ISOLDE facility. The comparison of the measured isotope
shifts in Po with a previous data set allows to test for the first
time recent large-scale atomic calculations that are essential to extract the
changes in the mean-square charge radius of the atomic nucleus. When going to
lighter masses, a surprisingly large and early departure from sphericity is
observed, which is only partly reproduced by Beyond Mean Field calculations.Comment: As submitted to PR
Enhanced performance of polymer: fullerene bulk heterojunction solar cells upon graphene addition
Graphene has potential for applications in solar cells. We show that the short circuit current density of P3HT (Poly(3-hexylthiophene-2,5-diyl):PCBM((6,6)-Phenyl C61 butyric acid methyl ester) solar cells is enhanced by 10% upon the addition of graphene, with a 15% increase in the photon to electric conversion efficiency. We discuss the performance enhancement by studying the crystallization of P3HT, as well as the electrical transport properties. We show that graphene improves the balance between electron and hole mobilities with respect to a standard P3HT:PCBM solar cell. (C) 2014 AIP Publishing LLC
Enhanced performance of polymer:fullerene bulk heterojunction solar cells upon graphene addition
Graphene has potential for applications in solar cells. We show that the short circuit current density of P3HT (Poly(3-hexylthiophene-2,5-diyl):PCBM((6, 6)-Phenyl C61 butyric acid methyl ester) solar cells is enhanced by 10% upon the addition of graphene, with a 15% increase in the photon to electric conversion efficiency. We discuss the performance enhancement by studying the crystallization of P3HT, as well as the electrical transport properties. We show that graphene improves the balance between electron and hole mobilities with respect to a standard P3HT:PCBM solar cell. © 2014 AIP Publishing LLC
Thick homoepitaxial (110)-oriented phosphorus-doped n-type diamond
The fabrication of n-type diamond is essential for the realization of electronic components for extreme environments. We report on the growth of a 66 μm thick homoepitaxial phosphorus-doped diamond on a (110)-oriented diamond substrate, grown at a very high deposition rate of 33 μm/h. A pristine diamond lattice is observed by high resolution transmission electron microscopy, which indicates the growth of high quality diamond. About 2.9 × 10^16 cm−3 phosphorus atoms are electrically active as substitutional donors, which is 60% of all incorporated dopant atoms. These results indicate that P-doped (110)-oriented diamond films deposited at high growth rates are promising candidates for future use in high-power electronic applications.This work was financially supported by the EU through
the FP7 Collaborative Project “DIAMANT,” the “H2020
Research and Innovation Action Project” “GreenDiamond”
(No. 640947), and the Research Foundation-Flanders (FWO)
(Nos. G.0C02.15N and VS.024.16N). J.V. acknowledges
funding from the “Geconcentreerde Onderzoekacties”
(GOA) project “Solarpaint” of the University of Antwerp.
The TEM instrument was partly funded by the Hercules fund
from the Flemish Government. We particularly thank Dr. J.
E. Butler (Naval Research Laboratory, USA) for the sample
preparation by laser slicing for TEM analysis, Dr. J. Pernot
(Universite Grenoble Alpes/CNRS-Institut Neel, France) for
helpful discussions, Ms. C. Vilar (Universite de Versailles
St. Quentin en Yvelines, France) for technical help on SEMCL
experiments, and Dr. S. S. Nicley (Hasselt University,
Belgium) for improving the language of the text. P.P. and
S.T. are Postdoctoral Fellows of the Research FoundationFlanders
(FWO).diamond; P-doping; CV
In-gas-cell laser ionization spectroscopy in the vicinity of 100 Sn: Magnetic moments and mean-square charge radii ofN=50–54 Ag
In-gas-cell laser ionization spectroscopy studies on the neutron deficient 97–101Ag isotopes have been performed with the LISOL setup. Magnetic dipole moments and mean-square charge radii have been determined for the first time with the exception of 101Ag, which was found in good agreement with previous experimental values. The reported results allow tentatively assigning the spin of
97,99Ag to 9/2 and confirming the presence of an isomeric state in these two isotopes, whose collapsed hyperfine
structure suggests a spin of 1/2 .The effectoftheN=50 shell closure is not only manifested in the magnetic moments but also in the evolution of the mean-square charge radii of the isotopes investigated,in accordance with the spherical droplet model predictions.publisher: Elsevier
articletitle: In-gas-cell laser ionization spectroscopy in the vicinity of 100Sn: Magnetic moments and mean-square charge radii of Ag
journaltitle: Physics Letters B
articlelink: http://dx.doi.org/10.1016/j.physletb.2013.11.055
content_type: article
copyright: Copyright © 2013 The Authors. Published by Elsevier B.V.status: publishe