8 research outputs found
La importancia de la personalidad del traductor en los itinerarios de especialidad y en la selección de personal
Treball Final de Grau en Traducció i Interpretació. Codi: TI0983. Curs acadèmic: 2016/2017A pesar de que a simple vista no lo pueda parecer, la personalidad de los traductores influye mucho más de lo que se cree en el proceso traductor y en la toma de decisiones, como han puesto de manifiesto estudios empíricos. Para analizar cuáles son las diferencias individuales en la personalidad de los traductores en la elección del itinerario de especialidad, se ha llevado a cabo un estudio con los estudiantes de los cuatro itinerarios de traducción de la Universidad Jaume I, a fin de ver si podemos identificar los rasgos típicos de los estudiantes de cada itinerario. Además, dada la gran importancia de la personalidad en las tareas de traducción, también se ha entrevistado a responsables de tres agencias de traducción para ver si la personalidad de los traductores es un factor relevante a la hora de reclutar personal. Se ha comprobado así que sí hay algunos rasgos comunes en la personalidad de los estudiantes de cada itinerario y que realmente esta cuestión no es un factor relevante en las agencias de traducción, sino que se valora, sobre todo, el trabajo diario y la calidad de las pruebas de traducción
High-Performance ZnO Nanowire Transistors with Aluminum Top-Gate Electrodes and Naturally Formed Hybrid Self-Assembled Monolayer/AlO<sub><i>x</i></sub> Gate Dielectric
A method for the formation of a low-temperature hybrid gate dielectric for high-performance, top-gate ZnO nanowire transistors is reported. The hybrid gate dielectric consists of a self-assembled monolayer (SAM) and an aluminum oxide layer. The thin aluminum oxide layer forms naturally and spontaneously when the aluminum gate electrode is deposited by thermal evaporation onto the SAM-covered ZnO nanowire, and its formation is facilitated by the poor surface wetting of the aluminum on the hydrophobic SAM. The hybrid gate dielectric shows excellent electrical insulation and can sustain voltages up to 6 V. ZnO nanowire transistors utilizing the hybrid gate dielectric feature a large transconductance of 50 μS and large on-state currents of up to 200 μA at gate-source voltages of 3 V. The large on-state current is sufficient to drive organic light-emitting diodes with an active area of 6.7 mm<sup>2</sup> to a brightness of 445 cd/m<sup>2</sup>. Inverters based on ZnO nanowire transistors and thin-film carbon load resistors operate with frequencies up to 30 MHz
Nanoantenna-Enhanced Infrared Spectroscopic Chemical Imaging
Spectroscopic
infrared chemical imaging is ideally suited for label-free
and spatially resolved characterization of molecular species, but
often suffers from low infrared absorption cross sections. Here, we
overcome this limitation by utilizing confined electromagnetic near-fields
of resonantly excited plasmonic nanoantennas, which enhance the molecular
absorption by orders of magnitude. In the experiments, we evaporate
microstructured chemical patterns of C<sub>60</sub> and pentacene
with nanometer thickness on top of homogeneous arrays of tailored
nanoantennas. Broadband mid-infrared spectra containing plasmonic
and vibrational information were acquired with diffraction-limited
resolution using a two-dimensional focal plane array detector. Evaluating
the enhanced infrared absorption at the respective frequencies, spatially
resolved chemical images were obtained. In these chemical images,
the microstructured chemical patterns are only visible if nanoantennas
are used. This confirms the superior performance of our approach over
conventional spectroscopic infrared imaging. In addition to the improved
sensitivity, our technique provides chemical selectivity, which would
not be available with plasmonic imaging that is based on refractive
index sensing. To extend the accessible spectral bandwidth of nanoantenna-enhanced
spectroscopic imaging, we employed nanostructures with dual-band resonances,
providing broadband plasmonic enhancement and sensitivity. Our results
demonstrate the potential of nanoantenna-enhanced spectroscopic infrared
chemical imaging for spatially resolved characterization of organic
layers with thicknesses of several nanometers. This is of potential
interest for medical applications which are currently hampered by
state-of-art infrared techniques, e.g., for distinguishing cancerous
from healthy tissues
Threshold-Voltage Shifts in Organic Transistors Due to Self-Assembled Monolayers at the Dielectric: Evidence for Electronic Coupling and Dipolar Effects
The mechanisms behind the threshold-voltage
shift in organic transistors due to functionalizing of the gate dielectric
with self-assembled monolayers (SAMs) are still under debate. We address
the mechanisms by which SAMs determine the threshold voltage, by analyzing
whether the threshold voltage depends on the gate-dielectric capacitance.
We have investigated transistors based on five oxide thicknesses and
two SAMs with rather diverse chemical properties, using the benchmark
organic semiconductor dinaphtho[2,3-b:2′,3′-<i>f</i>]thieno[3,2-<i>b</i>]thiophene. Unlike several
previous studies, we have found that the dependence of the threshold
voltage on the gate-dielectric capacitance is completely different
for the two SAMs. In transistors with an alkyl SAM, the threshold
voltage does not depend on the gate-dielectric capacitance and is
determined mainly by the dipolar character of the SAM, whereas in
transistors with a fluoroalkyl SAM the threshold voltages exhibit
a linear dependence on the inverse of the gate-dielectric capacitance.
Kelvin probe force microscopy measurements indicate this behavior
is attributed to an electronic coupling between the fluoroalkyl SAM
and the organic semiconductor
(Oligo-)Thiophene Functionalized Tetraazaperopyrenes: Donor–Acceptor Dyes and Ambipolar Organic Semiconductors
Tetraazaperopyrenes
(TAPPs) have been functionalized with thiophene
and terthiophene units of different architecture resulting in a variety
of organic donor–acceptor (D–A) compounds. The influence
of the connection of the thiophenes to the TAPP core on their structural,
photophysical and electrochemical properties has been studied in detail
by a combination of X-ray crystallography, UV–vis and fluorescence
spectroscopy as well as cyclic voltammetry, which allowed the establishment
of structure–property relationships. The HOMO–LUMO gap
is significantly decreased upon substitution of the TAPP core with
electron-donating thiophene units, the extent of which is strongly
influenced by the orientation of the thiophene units. The latter also
crucially directs the molecular packing in the solid. Linkage at the
α-position allows both inter- and intramolecular N···S
interaction, whereas linkage in the β-position prevents intramolecular
N···S interaction, resulting in a less pronounced conjugation
of the TAPP core and the thiophene units. The new TAPP derivatives
were processed as semiconductors in organic thin-film transistors
(TFTs) that show ambipolar behavior. The insight into band gap and
structure engineering may open up new possibilities to tailor the
electronic properties of TAPP-based materials for certain desired
applications
Few-Layer WSe<sub>2</sub> Schottky Junction-Based Photovoltaic Devices through Site-Selective Dual Doping
Ultrathin sheets of two-dimensional
(2D) materials like transition
metal dichalcogenides have attracted strong attention as components
of high-performance light-harvesting devices. Here, we report the
implementation of Schottky junction-based photovoltaic devices through
site-selective surface doping of few-layer WSe<sub>2</sub> in lateral
contact configuration. Specifically, whereas the drain region is covered
by a strong molecular p-type dopant (NDP-9) to achieve an Ohmic contact,
the source region is coated with an Al<sub>2</sub>O<sub>3</sub> layer,
which causes local n-type doping and correspondingly an increase of
the Schottky barrier at the contact. By scanning photocurrent microscopy
using green laser light, it could be confirmed that photocurent generation
is restricted to the region around the source contact. The local photoinduced
charge separation is associated with a photoresponsivity of up to
20 mA W<sup>–1</sup> and an external quantum efficiency of
up to 1.3%. The demonstrated device concept should be easily transferrable
to other van der Waals 2D materials
Hexathienocoronenes: Synthesis and Self-Organization
Here we report hexathienocoronenes (HTCs), fully thiophene-annelated
coronenes in which six double bonds in the periphery are thieno-fused.
The derivatives tetrasubstituted with hexyl and dodecyl chains show
a phase formation that strongly depends on the chain length. HTCs
are remarkably stronger donors than the known thiophene-annelated
coronenes but do not readily assemble into well-ordered films when
deposited from the vapor phase. Thus, thin-film transistors fabricated
by vacuum deposition have only modest field-effect mobilities of 0.002
cm<sup>2</sup> V<sup>–1</sup> s<sup>–1</sup>
High-Yield Transfer Printing of Metal–Insulator–Metal Nanodiodes
Nanoscale metal–insulator–metal (MIM) diodes represent important devices in the fields of electronic circuits, detectors, communication, and energy, as their cutoff frequencies may extend into the “gap” between the electronic microwave range and the optical long-wave infrared regime. In this paper, we present a nanotransfer printing method, which allows the efficient and simultaneous fabrication of large-scale arrays of MIM nanodiode stacks, thus offering the possibility of low-cost mass production. In previous work, we have demonstrated the successful transfer and electrical characterization of macroscopic structures. Here, we demonstrate for the first time the fabrication of several millions of nanoscale diodes with a single transfer-printing step using a temperature-enhanced process. The electrical characterization of individual MIM nanodiodes was performed using a conductive atomic force microscope (AFM) setup. Our analysis shows that the tunneling current is the dominant conduction mechanism, and the electrical measurement data agree well with experimental data on previously fabricated microscale diodes and numerical simulations