A5008537610- Silicon Nanostructures and Photoluminescence
- Silicon and Solar Cell Technologies
- Photonic Crystals and Applications
- Nanowire Synthesis and Applications
- Thin-Film Transistor Technologies
- Thermal Radiation and Cooling Technologies
- Photonic and Optical Devices
- solar cell performance optimization
- Astrophysical Phenomena and Observations
- Advanced Thermodynamics and Statistical Mechanics
- Semiconductor materials and interfaces
- Plasmonic and Surface Plasmon Research
- Spacecraft and Cryogenic Technologies
- Anodic Oxide Films and Nanostructures
- Integrated Circuits and Semiconductor Failure Analysis
- Gamma-ray bursts and supernovae
- Semiconductor materials and devices
- Astronomical Observations and Instrumentation
- Thermography and Photoacoustic Techniques
- Quantum Electrodynamics and Casimir Effect
- Optical properties and cooling technologies in crystalline materials
- Geophysics and Gravity Measurements
- Particle Detector Development and Performance
- Optical Coatings and Gratings
- Advancements in Semiconductor Devices and Circuit Design
Universitat Politècnica de Catalunya
2009-2023
Universitat de Vic - Universitat Central de Catalunya
2019-2023
All-Russian Scientific Research Institute of Technical Physics
2021
Aalto University
2019-2020
Tieto (Finland)
2020
FC Barcelona
2018-2020
Universitat Politècnica de València
2010-2014
Instituto de Ciencia de Materiales de Madrid
2011-2014
All-Russian Scientific Research Institute of Radio Engineering
2011
Consejo Superior de Investigaciones Científicas
2011
Astronomical Roentgen Telescope – X-ray Concentrator (ART-XC) is the hard instrument with grazing incidence imaging optics on board Spektr-Roentgen-Gamma (SRG) observatory. The SRG observatory flagship astrophysical mission of Russian Federal Space Program, which was successively launched into orbit around second Lagrangian point (L2) Earth-Sun system a Proton rocket from Baikonur cosmodrome 13 July 2019. ART-XC telescope will provide first ever true all-sky survey performed in 4–30 keV...
The thermal emission of cross-slit silicon carbide grating is studied in the Restrahlen region over all angles. We show experimentally that excitation surface-phonon polaritons on surface 2D allows us to get a high emissivity both polarizations, which collimated $p$ polarization for specific wavelength determined by periodicity grating. also numerically gratings optimized efficiently out-couple thermally excited flat part dispersion relation can have efficiency directions polarizations.
At present, ultraviolet sensors are utilized in numerous fields ranging from various spectroscopy applications via biotechnical innovations to industrial process control. Despite this, the performance of current UV is surprisingly poor. Here, we break theoretical one-photon--one-electron barrier and demonstrate a device with certified external quantum efficiency above 130% range without amplification. The record high obtained using nanostructured silicon photodiode self-induced junction. We...
This article studies theoretically and experimentally the recombination at amorphous/crystalline silicon interface of a heterojunction with intrinsic thin layer (HIT) structure without metallization. We propose physical model to calculate rate under illumination. calculates effective lifetime τeff as function average excess minority carrier concentration ⟨Δn⟩. In order test model, we prepared set HIT structures. The dependence vs ⟨Δn⟩ samples is measured using quasi-steady-state...
A new type of porous silicon based microcavity has been developed. The intrinsic photoluminiscence emission is strongly coupled to the whispering gallery modes resulting in a unique photonic fingerprint each particle. It may be envisaged as bar code like luminescent profile associated single Detailed facts importance specialist readers are published "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted by authors. Please note:...
Near-infrared (NIR) sensors find numerous applications within various industry fields, including optical communications and medical diagnostics. However, the state-of-the-art NIR made of germanium (Ge) suffer from rather poor response, largely due to high reflection illuminated device surface. We demonstrate here a method increase sensitivity Ge by implementing nanostructures wafer surfaces. The absorbance nanostructured wafers is measured be >99 % in whole UV-VIS-NIR spectrum up 1600 nm...
Cutting costs by progressively decreasing substrate thickness is a common theme in the crystalline silicon photovoltaic industry for last decades, since drastically thinner wafers would significantly reduce substrate-related costs. In addition to technological challenges concerning wafering and handling of razor-thin flexible wafers, major bottleneck maintain high absorption those thin wafers. For latter, advanced light-trapping techniques become paramount importance. Here we demonstrate...
ABSTRACT We present a catalogue of point sources detected with the Mikhail Pavlinsky ART-XC telescope onboard SRG observatory during wide-field survey Galactic Bulge that was conducted as part mission’s calibration and performance verification phase in 2019. The consisted nearly 18 d consecutive scanning observations sky region |l| < 6 deg, |b| 2.5 deg median sensitivity 4 × 10−13 erg s−1 cm−2 4–12 keV energy band, which allows detection down to luminosity 3 1033 near Centre. Using...
We present an updated catalog of sources detected by the Mikhail Pavlinsky ART-XC telescope aboard Spektrum-Roentgen-Gamma (SRG) observatory during its all-sky survey. It is based on data first four and partially completed fifth scans sky (ARTSS1-5). The comprises 1545 in 4–12 keV energy band. achieved sensitivity ranges between ~4 × 10 −12 erg s −1 cm −2 near ecliptic plane ~7 −13 poles, which a ~30–50% improvement over previous version two (ARTSS12). There are ~130 objects, excluding...
Surface-passivating properties of hydrogenated amorphous silicon carbide films (a-SiCx:H) deposited by plasma-enhanced chemical-vapor deposition on both p- and n-type crystalline (c-Si) have been extensively studied our research group in previous publications. We characterized surface recombination measuring the dependence effective lifetime (τeff) excess carrier density (Δn) through quasi-steady-state photoconductance technique. Additionally, we fitted measured τeff(Δn) curves applying an...
During the last years, many techniques have been developed to obtain thin crystalline films from commercial silicon ingots. Large market applications are foreseen in photovoltaic field, where important cost reductions predicted, and also advanced microelectronics technologies as three-dimensional integration, system on foil, or interposers [Dross et al., Prog. Photovoltaics 20, 770-784 (2012); R. Brendel, Thin Film Crystalline Silicon Solar Cells (Wiley-VCH, Weinheim, Germany 2003); J. N....
Silicon colloids are presented as efficient absorbers in the VIS-NIR region. The theory of resonant absorption by Mie modes a single high-index sphere is reviewed and engineering rules established. model predicts enhanced crystalline silicon band-to-band region, with efficiencies exceeding one VIS excellent NIR response. A maximum efficiency close to 4 can be obtained at violet region (425 nm), values above 0.25 possible bandgap edge wavelengths up 1400 nm. proposed promising cost-effective,...
Abstract Macroporous silicon membranes, prepared by photo‐electrochemical etching, were subjected to pore widening performed multiple oxidation/oxide‐stripping cycles. We study the dependence of cross section and diameter on oxidation parameters. The anisotropy process allows us correct faceted shape after etching obtain pores with circular section. shown post‐treatment macroporous extends possibilities electrochemical produce structures a desired geometry. (© 2007 WILEY‐VCH Verlag GmbH...
Spectrum Roentgen Gamma (SRG) is an X-ray astrophysical observatory, developed by Russia in collaboration with Germany. The mission will be launched 2013 from Baikonur, a Zenit rocket Fregat booster and placed 6-month-period halo orbit around L2. scientific payload consists of two independent telescopes - soft-x-ray survey instrument, eROSITA, being provided Germany medium-x-ray-energy instrument ART-XC Russia. consist seven independent, but co-aligned, telescope modules corresponding...
The reorganization through high-temperature annealing of closely-packed pore arrays can be exploited to create ultra-thin (<20 µm) monocrystalline silicon layers that work as cheap and flexible substrates for both the electronic photovoltaic industries. By introducing a periodic diameter modulation along deep etched pores, many thin produced from single substrate in technological process. Besides periodicity, exact shape also has profound impact on process subtle profile changes lead...
Surface passivation of p-type crystalline silicon wafers by means phosphorus-doped hydrogenated amorphous carbide films [a-SiCx(n):H] has been investigated. Particularly, we focused on the effects layer thickness c-Si surface quality resulting in determination fixed charge density, Qf, within a-SiCx(n):H film and fundamental recombination holes, Sp0. The main result is that velocity decreases with up to 40nm then saturates. evolution interface parameters indicates Qf could be located a less...
In this Letter we report on the thermal properties of macroporous silicon photonic crystals with unit cell gradually varied along pore axis. We show experimentally that arbitrarily large omnidirectional total-reflectance bands can be produced such structures. also demonstrate those effectively used to reduce radiation in spectral bands.
We have recently developed a new type of silicon structure that we refer to as colloid. This material consists almost perfectly spherical micro- and nanoparticles with very smooth surface. They are able trap light efficiently in large-span frequency range covering the visible far infrared regions. Silicon colloids can be thought completely for scientific technological purposes, manifold applications electronics, photonics, cosmetics, or paints, among others. Here, report on synthesis...
Spectrum Roentgen Gamma (SRG) is an X-ray astrophysical observatory, developed by Russia in collaboration with Germany. The mission will be launched 2014 from Baikonur, a Zenit rocket Fregat booster and placed 6-month-period halo orbit around L2. scientific payload consists of two independent telescopes – soft-x-ray survey instrument, eROSITA, being provided Germany medium-x-ray-energy instrument ART-XC Russia. consist seven independent, but co-aligned, telescope modules corresponding...
Planck's law constitutes one of the cornerstones in physics. It explains well-known spectrum an ideal blackbody consisting a smooth curve, whose peak wavelength and intensity depend on temperature body. This scenario changes drastically, however, when size emitting object is comparable to emitted radiation. Here we show that silicon microsphere (2–3 μm diameter) heated around 800 °C yields thermal emission pronounced peaks are associated with Mie resonances. We experimentally demonstrate...