251 research outputs found
Combined photo- and electroreflectance of multijunction solar cells enabled by subcell electric coupling
Electric coupling between subcells of a monolithically grown multijunction
solar cell in short circuit allows their simultaneous and independent
characterization by means of photo- and electroreflectance. The photovoltage
generated by selective absorption of the pump beam in a given subcell during
photoreflectance measurements results in reverse biasing the complementary
subunits at the modulation frequency set on the pump illumination. Such voltage
bias modulation acts then as external perturbation on the complementary
subcells. The spectral separation of the different subcell absorption ranges
permits the probe beam to record in a single spectrum the response of the
complete device as a combination of photo- and electroreflectance, thereby
providing access for diagnosis of subcells on an individual basis. This form of
modulation spectroscopy is demonstrated on a GaInP/GaAs tandem solar cell.Comment: 5 pages, 4 figures. This article has been accepted by Appl. Phys.
Lett. After it is published, it will be found at
https://doi.org/10.1063/1.506260
First principles study of the adsorption of C60 on Si(111)
The adsorption of C60 on Si(111) has been studied by means of
first-principles density functional calculations.
A 2x2 adatom surface reconstruction was used to simulate the terraces of the
7x7 reconstruction.
The structure of several possible adsorption configurations was optimized
using the ab initio atomic forces, finding good candidates for two different
adsorption states observed experimentally.
While the C60 molecule remains closely spherical, the silicon substrate
appears quite soft, especially the adatoms, which move substantially to form
extra C-Si bonds, at the expense of breaking Si-Si bonds.
The structural relaxation has a much larger effect on the adsorption
energies, which strongly depend on the adsorption configuration, than on the
charge transfer.Comment: 4 pages with 3 postscript figures, to appear in Surf. Science.
(proceedings of the European Conference on Surface Science ECOSS-19, Sept
2000
A primal-dual splitting algorithm for composite monotone inclusions with minimal lifting
In this work, we study resolvent splitting algorithms for solving composite monotone inclusion problems. The objective of these general problems is finding a zero in the sum of maximally monotone operators composed with linear operators. Our main contribution is establishing the first primal-dual splitting algorithm for composite monotone inclusions with minimal lifting. Specifically, the proposed scheme reduces the dimension of the product space where the underlying fixed point operator is defined, in comparison to other algorithms, without requiring additional evaluations of the resolvent operators. We prove the convergence of this new algorithm and analyze its performance in a problem arising in image deblurring and denoising. This work also contributes to the theory of resolvent splitting algorithms by extending the minimal lifting theorem recently proved by Malitsky and Tam to schemes with resolvent parameters.FJAA and DTB were partially supported by the Ministry of Science, Innovation and Universities of Spain and the European Regional Development Fund (ERDF) of the European Commission, Grant PGC2018-097960-B-C22. FJAA was partially supported by the Generalitat Valenciana (AICO/2021/165). RIB was partially supported by FWF (Austrian Science Fund), project P 34922-N. DTB was supported by MINECO and European Social Fund (PRE2019-090751) under the program “Ayudas para contratos predoctorales para la formación de doctores” 2019
Do Thiols Merely Passivate Gold Nanoclusters?
A Comment on the Letter by H. Hakkinen, R. N. Barnett, and U. Landman, Phys. Rev. Lett. 82, 3264 (1999)
Poblament de Reus durant l'ocupació francesa
El control de població per mitjà deis censos representa, entre d'altres, un instrument per a l'obtenció d'impostos. El cens ens pot servir, endemés, per a estudiar la població —com és el cas que ens ocupa— d'una ciutat tan important com fou Reus durant el segle XIX. El cens del 1810 cal integrar-lo en un context general de guerra. El primer rumor que inquietà els habitants de Reus en referència als francesos fou percebut el 17 d'abril del 1808, quan els francesos entren a Tarragona, per bé que llur presència no fou efectiva a Reus —com ens diu Pere Anguera— fins el febrer del 1809, després de la derrota del Pont de Goi. Les negociacions perquè les tropes napoleòniques respectessin persones i béns van costar a Reus 20.000 duros, més 20.000 raccions de postres i encara la tala de 20.000 olivers per a fortificacions. Al llarg de la guerra, els tributs imposats per ambdos exèrcits arribaren a arruinar la ciutat, en ésser-li exigides unes imposicions pecuniàries molt elevades, ultra aliments, roba i calçat; i, de la part espanyola, a més a més, homes
Chirality in Bare and Passivated Gold Nanoclusters
Chiral structures have been found as the lowest-energy isomers of bare
(Au and Au_{28}(SCH_{16}_{38}(SCH_{3})_{24}) gold nanoclusters. The degree of chirality existing in
the chiral clusters was calculated using the Hausdorff chirality measure. We
found that the index of chirality is higher in the passivated clusters and
decreases with the cluster size. These results are consistent with the observed
chiroptical activity recently reported for glutahione-passivated gold
nanoclusters, and provide theoretical support for the existence of chirality in
these novel compounds.Comment: 5 pages, 1 figure. Submitted to PR
Potential of the three-Terminal heterojunction bipolar transistor solar cell for space applications
Multi-Terminal multi-junction solar cells (MJSC) offer higher efficiency potential than series connected (two-Terminal) ones. In addition, for terrestrial applications, the efficiency of multi-Terminal solar cells is less sensitive to solar spectral variations than the two-Terminal series-connected one. In space, generally, cells are always illuminated with AM0 spectrum and no impact is expected from spectral variations. Still, in space, the multi-Terminal approach offers some advantages in comparison with the series-connected architecture approach derived from a higher end of life (EOL) efficiency. In this work we review the potential of multi-Terminal solar cells for achieving extended EOL efficiencies with emphasis in the potential of the three-Terminal heterojunction bipolar transistor solar cell, a novel multi-Terminal MJSC architecture with a simplified structure not requiring, for example, tunnel junctions
Atomic layering at the liquid silicon surface: a first- principles simulation
We simulate the liquid silicon surface with first-principles molecular
dynamics in a slab geometry. We find that the atom-density profile presents a
pronounced layering, similar to those observed in low-temperature liquid metals
like Ga and Hg. The depth-dependent pair correlation function shows that the
effect originates from directional bonding of Si atoms at the surface, and
propagates into the bulk. The layering has no major effects in the electronic
and dynamical properties of the system, that are very similar to those of bulk
liquid Si. To our knowledge, this is the first study of a liquid surface by
first-principles molecular dynamics.Comment: 4 pages, 4 figures, submitted to PR
Stiff monatomic gold wires with a spinning zigzag geometry
Using first principles density functional calculations, gold monatomic wires
are found to exhibit a zigzag shape which remains under tension, becoming
linear just before breaking. At room temperature they are found to spin, what
explains the extremely long apparent interatomic distances shown by electron
microscopy.The zigzag structure is stable if the tension is relieved, the wire
holding its chainlike shape even as a free-standing cluster. This unexpected
metallic-wire stiffness stems from the transverse quantization in the wire, as
shown in a simple free electron model.Comment: 4 pages, latex, 5 figures, submitted to PR
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