cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Efficiency Gain of Silicon Ink Selective Emitter Solar Cells at Module Level
Creators: name: Burrows, M.
name: Meisel, A.
name: Inns, D.
name: Terry, M.
name: Lemmi, F.
name: Antoniadis, H.
name: Ma, Y.
name: Wei, Q.
name: Narayanan, S.
Publisher: name: WIP
Year: 2011
Subjects: Wafer-based Silicon Solar Cells and Materials Technology
Silicon Solar Cell Improvements

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 1319-1322
description: The DuPont Innovalight CougarTM Platform is a selective emitter (SE) process based on screen-printed
Silicon Ink. This report presents the module performance Silicon Ink SE cells. This study is the first systematic and
large-scale comparison of full size 54 cell selective emitter and homogeneous emitter (HE) solar panels produced
with industry standard materials and facilities. The modules are fabricated and tested in the production facility of
Hanwha SolarOne in Qidong, Jiangsu Province, China. The cell-to-module (CTM) power ratio Silicon Ink SE cells
was 94.8 % compared to 95.6 % for HE cells. The Silicon Ink SE modules achieved an average of 16.9 %, an efficiency
improvement of 0.94 % (absolute) above HE modules fabricated under identical conditions. The set of fullsize
Silicon Ink SE modules described in this study were additionally submitted to TÜV Rheinland and passed certification
of PV modules to the standards IEC-61215 and IEC-61730. This result is encouraging as it shows the efficiency
gain from the advanced Silicon Ink SE architecture is maintained at the module level with standard industrial
module processing.
Wirkungen des fahrerlosen Fahrens im Logistiksystem
Creators: name: Tjaden, Sandra
Publisher: name: TUHH Universitätsbibliothek
Year: 2023
Subjects: subject: Fahrerloses Fahren
subject: Logistik
subject: System dynamics
subject: Wirkungen
subject: Straßengüterverkehr
classificationCode: 620
subject: Ingenieurwissenschaften

description: Mit Einführung des fahrerlosen Fahrens wird sich das Logistiksystem verändern. Die Wirkungen sind in der bestehenden Literatur bislang jedoch wenig diskutiert. Die Arbeit analysiert die Wirkungen des fahrerlosen Fahrens im Logistiksystem und ermittelt mögliche Rückkopplungsschleifen. Die Ergebnisse basieren auf einer Literaturanalyse und einem dreistufigen Modellansatz, der die Wirkungen sowohl qualifiziert als auch quantifiziert und die Ableitung von Gestaltungsoptionen zulässt, mit denen die relevanten Akteure unerwünschte Wirkungen reduzieren können.
description: The driverless driving will change the logistics system in the future. These changes are little discussed in the existing literature so far. This work helps to understand the effects of driverless driving in the logistics system. The findings are based on a literature review and a three-stage model approach, which qualifies the effects as well as quantifies them and allows the derivation of design options, which can be used by the relevant actors to reduce undesirable effects.
Finite-size scaling of the magnetization probability density for the critical Ising model in slab geometry
Creators: name: Cardozo, David Lopes
name: Holdsworth, Peter C. W.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The magnetization probability density in d=2 and 3 dimensional Ising models in slab geometry of volume $L_{\parallel}^{d-1} \times L_{\perp}$ is computed through Monte-Carlo simulation at the critical temperature and zero magnetic field. The finite-size scaling of this distribution and its dependence on the system aspect-ratio $ρ=\frac{L_{\perp}}{L_{\parallel}}$ and boundary conditions is discussed. In the limiting case $ρ\to 0$ of a macroscopically large slab ($L_{\parallel} \gg L_{\perp}$) the distribution is found to scale as a Gaussian function for all tested system sizes and boundary conditions.
description: 10 pages, 17 images in 7 figures
Spin-wave thermal population as temperature probe in Magnetic Tunnel Junctions
Creators: name: Goff, Adrien Le
name: Nikitin, Vladimir
name: Devolder, Thibaut
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study whether a direct measurement of the absolute temperature of a Magnetic Tunnel Junction (MTJ) can be performed using the high frequency electrical noise that it delivers under a finite voltage bias. Our method includes quasi-static hysteresis loop measurements of the MTJ, together with the field-dependence of its spin wave noise spectra. We rely on an analytical modeling of the spectra by assuming independent fluctuations of the different sub-systems of the tunnel junction that are described as macrospin fluctuators. We illustrate our method on perpendicularly magnetized MgO-based MTJs patterned in 50*100 nm2 nanopillars. We apply hard axis (in-plane) fields to let the magnetic thermal fluctuations yield finite conductance fluctuations of the MTJ. Instead of the free layer fluctuations that are observed to be affected by both spin-torque and temperature, we use the magnetization fluctuations of the sole reference layers. Their much stronger anisotropy and their much heavier damping render them essentially immune to spin-torque. We illustrate our method by determining current-induced heating of the perpendicularly magnetized tunnel junction at voltages similar to those used in spin-torque memory applications. The absolute temperature can be deduced with a precision of +/- 60 K and we can exclude any substantial heating at the spin-torque switching voltage.
description: 10 pages, 6 figures
Quality Control of PV-Modules in the Field Using Infrared-Thermography
Creators: name: Buerhop-Lutz, C.
name: Schlegel, D.
name: Vodermayer, C.
name: Nieß, M.
Publisher: name: WIP
Year: 2011
Subjects: PV Systems
Large PV Power Plants and Distributed PV: System Aspects and Grid Connection

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 3894-3897
description: Detecting hot spots in photovoltaic (PV) generators using infrared (IR) imaging has become a valuable
tool in the last years. Identifying faulty or defect PV-modules in large PV-generators with IR thermography is a cost
and time saving method to evaluate PV plants under operating conditions. In the course of this evaluation 16 different
PV-plants with crystalline modules, of different operating time, were investigated. Additionally, about 260 modules
have been dismantled and analyzed regarding electroluminescence, IR thermography applying an external current and
power measurements. All defects like short-circuited cells, faulty soldering, bypassed substrings and cell fractures
could be visualized. It was demonstrated that the detected defects show an observable impact on the resulting module
temperature, the IV curve and the power output. One major part of this study was to evaluate the correlation between
temperature increase and power reduction. Furthermore, at selected PV plants the importance and reliability of IR
overview scans has been proved, by verifying that all modules or cells with increased temperature show significantly
reduced power output. Then, aging effects of single „pre-damaged“modules could be documented by using IR
imaging and a first correlation between the age of PV-plants and the number of defects can be presented.
Hodgson Residence [Project: 006-09-61]
Creators: name: Hodgson, Alan J. (Alan James)
Publisher: name: University of Victoria Libraries
Year: 2022
Subjects: subject: Architecture
valueUri: http://id.worldcat.org/fast/813346
subject: FOS: Civil engineering
subject: Architecture, Domestic
valueUri: http://id.worldcat.org/fast/813666
subject: Modern movement (Architecture)
valueUri: http://id.worldcat.org/fast/1024437
subject: Architecture, Modern
valueUri: http://id.worldcat.org/fast/813842
subject: Architects
valueUri: http://id.worldcat.org/fast/813114

description: Project material consists of one large folder of architectural drawings pertaining to the design and many subsequent additions and alterations to the residence of architect Alan J. Hodgson and Sheila C. Hodgson. The residence is located at 404 Henry Street in Victoria, B.C. Included are site plans; foundation plans; floor plans; section drawings; elevations; detail drawings; electrical plans; heating plans; sketches; notes; a printout of a short online piece on the residence from the Maltwood Art Museum and Gallery; and other material produced at various stages of the design process. The Hodgson Residence was designated a City of Victoria Heritage Property in 2020.
Control strategies for flexible link parallel robots
Creators: name: Morlock, Merlin
Publisher: name: TUHH Universitätsbibliothek
Year: 2023
Subjects: subject: model-based control
subject: flexible multibody systems
subject: parallel robots
subject: flexible link robots
subject: end-effector trajectory tracking
subject: oscillation damping control
classificationCode: 600
subject: Technology

description: This research contributes to the field of flexible link parallel robots by showing how a variety of inherent control problems of such robots can be solved. Since the focus lies on promising techniques, well-established approaches are adapted to these robots. The proposed methods are experimentally validated within realistic scenarios. These confirm the need for modern controllers based on flexible multibody models as in most cases they significantly outperform controllers based on classical rigid multibody models.
description: Diese Forschungsarbeit trägt zum Gebiet der parallelen Roboter mit flexiblen Armen bei, indem aufgezeigt wird wie eine Vielzahl von inhärenten Regelungsproblemen solcher Roboter gelöst werden kann. Da der Fokus auf vielversprechenden Techniken liegt, werden etablierte Ansätze an diese Roboter adaptiert. Die vorgebrachten Methoden werden in realistischen Szenarien experimentell validiert. Diese bestätigen den Bedarf an modernen Reglern welche auf flexiblen Mehrkörpermodellen basieren, da sie zumeist Reglern welche auf klassischen starren Mehrkörpermodellen basieren deutlich überlegen sind.
Process Optimization and Device Characterization of Laser-Doped Selective Emitter Solar Cell on p-Type Czochralski Silicon Wafer
Creators: name: Xu, G.
name: Yao, Y.
name: Chong, C.M.
name: Hallam, B.J.
name: Hameiri, Z.
name: Yang, C.
name: Wenham, S.R.
Publisher: name: WIP
Year: 2011
Subjects: Wafer-based Silicon Solar Cells and Materials Technology
Silicon Solar Cell Improvements

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 1323-1328
description: Laser-doped selective emitter (LDSE) technology enables the patterning of the dielectric layer and
localised doping in one step. Combined with self-aligned metallization, it could be a cost effective way to achieve
high efficiency solar cell in large scale production. This paper presents two key processes: laser doping and light
induce plating in the LDSE solar cell process. Wide ranges of parameters were investigated in detail for each process,
such that systematic improvements were demonstrated. The influences of different parameters on final solar cell
devices were studied through the use of techniques such as light I-V curve, spectral response, scanning electron
microscope, focus ion beam etc. As a result of optimizations, a final solar cell device with efficiency >19% was
achieved on p-type 1 cm Czochralski silicon wafer.
Manipulation of light transport in disordered media by reciprocal design
Creators: name: Maiwald, Lukas
Publisher: name: TUHH Universitätsbibliothek
Year: 2023
Subjects: subject: Light Scattering
subject: Reciprocal Design
subject: Ewald Sphere
subject: Photonics
subject: Complete Bandgap
subject: Disorder
subject: Quasicrystals
subject: Photonic Crystals
classificationCode: 621.3
subject: Electrical Engineering, Electronic Engineering

description: In this work different aspects of the scattering of light in disordered optical structures are elucidated. The applicability of the Ewald sphere construction to non-iridescent structural colors is investigated by comparison of analytical to simulation results. Moreover, a mathematical derivation is presented and again tested against simulation, predicting the possibility of obtaining complete photonic bandgaps in structures with arbitrarily low refractive-index contrast.
description: In dieser Arbeit werden verschiedene Aspekte der Lichtstreuung in ungeordneten optischen Materialien beleuchtet. Anhand von analytischen und Simulations-Ergebnissen wird die Anwendbarkeit der Ewaldkonstruktion für nicht-irisierende Strukturfarben untersucht. Außerdem wird ein mathematischer Ansatz präsentiert und wiederum gegen Simulationen geprüft, nach dem eine vollständige photonische Bandlücke in Strukturen mit beliebig geringen Brechungsindexkontrasten möglich ist.
Quantum interference induced photon localisation and delocalisation in coupled cavities
Creators: name: Meher, Nilakantha
name: Sivakumar, S.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study photon localisation and delocalisation in a system of two nonlinear cavities with intensity-dependent coupling. It is shown that complete localisation or delocalisation is possible for proper choices of the strengths of nonlinearity, detuning and inter-cavity coupling. Role of the relative phase in the initial superposition in attaining localisation and delocalisation is discussed. Effects of dissipation and decoherence are considered and the use of quantum interference in reducing dissipation is explored. Many of the features of the system are shown to be the consequences of quantum interference.
description: 18 pages, 10 figures
Quantifying correlations between galaxy emission lines and stellar continua
Creators: name: Beck, Róbert
name: Dobos, László
name: Yip, Ching-Wa
name: Szalay, Alexander S.
name: Csabai, István
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We analyse the correlations between continuum properties and emission line equivalent widths of star-forming and active galaxies from the Sloan Digital Sky Survey. Since upcoming large sky surveys will make broad-band observations only, including strong emission lines into theoretical modelling of spectra will be essential to estimate physical properties of photometric galaxies. We show that emission line equivalent widths can be fairly well reconstructed from the stellar continuum using local multiple linear regression in the continuum principal component analysis (PCA) space. Line reconstruction is good for star-forming galaxies and reasonable for galaxies with active nuclei. We propose a practical method to combine stellar population synthesis models with empirical modelling of emission lines. The technique will help generate more accurate model spectra and mock catalogues of galaxies to fit observations of the new surveys. More accurate modelling of emission lines is also expected to improve template-based photometric redshift estimation methods. We also show that, by combining PCA coefficients from the pure continuum and the emission lines, automatic distinction between hosts of weak active galactic nuclei (AGNs) and quiescent star-forming galaxies can be made. The classification method is based on a training set consisting of high-confidence starburst galaxies and AGNs, and allows for the similar separation of active and star-forming galaxies as the empirical curve found by Kauffmann et al. We demonstrate the use of three important machine learning algorithms in the paper: k-nearest neighbour finding, k-means clustering and support vector machines.
description: 14 pages, 14 figures. Accepted by MNRAS on 2015 December 22. The paper's website with data and code is at http://www.vo.elte.hu/papers/2015/emissionlines/
Caratterizzazione del potenziale anti-infiammatorio di oleocantale e acido oleocantalico in un modello di microglia attivata con LPS
Creators: name: Bolognini, Luca
Publisher: name: Zenodo
Year: 2024

description: Le malattie neurodegenerative come le malattie di Parkinson e di Alzheimer hanno un elevato tasso di mortalità, sono caratterizzate da una progressiva degenerazione e le cure attualmente disponibili agiscono prevalentemente solo a livello sintomatico. Dunque, viste le ridotte opzioni terapeutiche e considerato l’innalzamento dell’età media nei prossimi anni, è importante identificare possibili composti ad attività neuroprotettiva per tentare di garantire un livello di salute più elevato alle persone anziane e per contenere i costi crescenti legati all'erogazione di servizi sanitari. Una delle principali cause associate alla neurodegenerazione è la neuroinfiammazione che, quando eccessiva ha un impatto negativo sull’omeostasi cerebrale, da qui l’importanza di identificare molecole che abbiano attività anti-infiammatoria a livello del tessuto cerebrale.

La mia tesi ha l’obiettivo di indagare le proprietà anti-infiammatorie di due molecole dell’olio di oliva: l’oleocantale (OL) e un suo prodotto di degradazione, l’acido oleocantalico (OA). L’olio di oliva è il principale condimento e una delle maggiori fonti di grassi della dieta mediterranea (DM). Negli esperimenti condotti sono state indagate le capacità anti-ossidanti e anti-infiammatorie di OL e OA in un modello in vitro di microglia murina (cellule BV-2) attivata da lipopolisaccaride (LPS). Gli esperimenti effettuati consistono in test per la valutazione del glutatione ridotto (GSH), test per la valutazione della formazione di specie reattive dell’ossigeno (ROS) intracellulari e un’analisi dell’espressione proteica dei principali enzimi pro-infiammatori (iNOS, COX-2, NLRP3).

I risultati hanno dimostrato una elevata capacità anti-infiammatoria e anti-ossidante dell’oleocantale quando usato come pretrattrametno (a concentrazione 10 μM) precedentemente al trattamento con LPS, mentre l’acido oleocantalico, nelle stesse condizioni, ha mostrato una bassa attività anti-ossidante e nessuna attività anti-infiammatoria.
Plasma Deposition of Amorphous Silicon Dopant Sources
Creators: name: Jeurink, J.
name: Seiffe, J.
name: Hofmann, M.
name: Rentsch, J.
name: Preu, R.
Publisher: name: WIP
Year: 2011
Subjects: Wafer-based Silicon Solar Cells and Materials Technology
Silicon Solar Cell Improvements

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 1329-1333
description: The basic idea of a dry solar cell process is to minimize the application of wet chemical process steps.
By using plasma-enhanced chemical processes, many steps can be converted from wet chemical to dry plasma
processes. In previous studies it could be demonstrated, that it is possible to deposit a phosphorus silicate glass (PSG)
via plasma-enhanced chemical vapor deposition (PECVD) processes and to use these layers for emitter diffusion in a
high-temperature furnace. In order to enable the removal of the dopant source combined with an etch back of the
highly phosphorus containing top layer of the emitter (so called “dead layer”) within a single plasma etch step, the
use of doped amorphous silicon as dopant source has been investigated throughout this study. To the knowledge of
the authors, the application of a-Si as dopant source prior to high temperature diffusion is almost unexplored;
therefore the paper investigates the suitability of this approach for industrial solar cell processing. As shown, doped
a-Si layers offer a diffusion of phosphorus as well as boron, but an oxidation of the layer while the high temperature
diffusion could not be avoided straightforwardly.
Hartree-Fock and Random Phase Approximation theories in a many-fermion solvable model
Creators: name: Co', Giampaolo
name: De Leo, Stefano
Publisher: name: arXiv
Year: 2016
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We present an ideal system of interacting fermions where the solutions of the many-body Schroedinger equation can be obtained without making approximations. These exact solutions are used to test the validity of two many-body effective approaches, the Hartree-Fock and the Random Phase Approximation theories. The description of the ground state done by the effective theories improves with increasing number of particles.
description: 17 pages, 2 figures
Characterization of Electrodeposited Cadmium Selenide Thin Films
Creators: name: Chowdhury, R.I.
name: Hossain, M.S.
name: Sabeth, F.
name: Mustafa, G.
name: Farhad, S.F.U.
name: Saha, D.K.
name: Chowdhury, F.A.
name: Hussain, S.
name: Islam, A.B.M.O.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Thin Films Solar Cells
CdTe Solar Cells

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 3077-3079
description: Cadmium selenide (CdSe) thin films have been deposited on glass/conducting glass substrates using low-cost
electrodeposition method. X-ray diffraction (XRD) technique has been used to identify the phases present in the deposited films and
observed that the deposited films are mainly consisting of CdSe phases. The photoelectrochemical (PEC) cell measurements indicate
that the CdSe films are n-type in electrical conduction, and optical absorption measurements show that the bandgap for as-deposited
film is estimated to be 2.1 eV. Upon heat treatment at 723 K for 30 min in air the band gap of CdSe film is decreased to 1.8 eV. The
surface morphology of the deposited films has been characterized using scanning electron microscopy (SEM) and observed that very
homogeneous and uniform CdSe film is grown onto FTO/glass substrate. The aim of this work is to use n-type CdSe window
materials in CdTe based solar cell structures. The results will be presented in this paper in the light of observed data.
Caratterizzazione del potenziale anti-infiammatorio di oleocantale e acido oleocantalico in un modello di microglia attivata con LPS
Creators: name: Bolognini, Luca
Publisher: name: Zenodo
Year: 2024
Subjects: subject: Nutrition
subject: Neurobiology

description: Le malattie neurodegenerative come le malattie di Parkinson e di Alzheimer hanno un elevato tasso di mortalità, sono caratterizzate da una progressiva degenerazione e le cure attualmente disponibili agiscono prevalentemente solo a livello sintomatico. Dunque, viste le ridotte opzioni terapeutiche e considerato l’innalzamento dell’età media nei prossimi anni, è importante identificare possibili composti ad attività neuroprotettiva per tentare di garantire un livello di salute più elevato alle persone anziane e per contenere i costi crescenti legati all'erogazione di servizi sanitari. Una delle principali cause associate alla neurodegenerazione è la neuroinfiammazione che, quando eccessiva ha un impatto negativo sull’omeostasi cerebrale, da qui l’importanza di identificare molecole che abbiano attività anti-infiammatoria a livello del tessuto cerebrale.

La mia tesi ha l’obiettivo di indagare le proprietà anti-infiammatorie di due molecole dell’olio di oliva: l’oleocantale (OL) e un suo prodotto di degradazione, l’acido oleocantalico (OA). L’olio di oliva è il principale condimento e una delle maggiori fonti di grassi della dieta mediterranea (DM). Negli esperimenti condotti sono state indagate le capacità anti-ossidanti e anti-infiammatorie di OL e OA in un modello in vitro di microglia murina (cellule BV-2) attivata da lipopolisaccaride (LPS). Gli esperimenti effettuati consistono in test per la valutazione del glutatione ridotto (GSH), test per la valutazione della formazione di specie reattive dell’ossigeno (ROS) intracellulari e un’analisi dell’espressione proteica dei principali enzimi pro-infiammatori (iNOS, COX-2, NLRP3).

I risultati hanno dimostrato una elevata capacità anti-infiammatoria e anti-ossidante dell’oleocantale quando usato come pretrattrametno (a concentrazione 10 μM) precedentemente al trattamento con LPS, mentre l’acido oleocantalico, nelle stesse condizioni, ha mostrato una bassa attività anti-ossidante e nessuna attività anti-infiammatoria.
Semi-implicit Taylor schemes for stiff rough differential equations
Creators: name: Riedel, Sebastian
Publisher: name: Weierstrass Institute
Year: 2020
Subjects: subject: Rough paths
subject: semi-implicit Taylor schemes
subject: stiff systems
subject: stochastic differential equations
subject: 60G15
subject: 60H10
subject: 65C30

description: We study a class of semi-implicit Taylor-type numerical methods that are easy to implement and designed to solve multidimensional stochastic differential equations driven by a general rough noise, e.g. a fractional Brownian motion. In the multiplicative noise case, the equation is understood as a rough differential equation in the sense of T. Lyons. We focus on equations for which the drift coefficient may be unbounded and satisfies a one-sided Lipschitz condition only. We prove well-posedness of the methods, provide a full analysis, and deduce their convergence rate. Numerical experiments show that our schemes are particularly useful in the case of stiff rough stochastic differential equations driven by a fractional Brownian motion.
Progress in Laser Chemical Processing for Silicon Solar Cells
Creators: name: Granek, F.
name: Hopman, S.
name: Kluska, S.
name: Fell, A.
name: Breitwieser, M.
name: Fleischmann, C.
name: Glatthaar, M.
name: Glunz, S.W.
Publisher: name: WIP
Year: 2011
Subjects: Wafer-based Silicon Solar Cells and Materials Technology
Silicon Solar Cell Improvements

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 1300-1304
description: An overview of the selected current research focuses of Laser Chemical Processing (LCP) technology at Fraunhofer
ISE is given. The efforts to support the industrialization phase of the LCP technology include: (i) the processing of
large-area solar cells, (ii) improving the uniformity of the laser doping, (iii) reducing the process cost by applying
low-cost doping mediums and by eliminating the need of neutralization of the waste chemicals, and (iv) developing a
LCP boron doping process, which is very attractive for the formation of the local back surface field for the p-type
cells and for the formation of selective emitter for n-type solar cells.
The sequence to hydrogenate coronene cations: A journey guided by magic numbers
Creators: name: Cazaux, Stéphanie
name: Boschman, Leon
name: Rougeau, Nathalie
name: Reitsma, Geert
name: Hoekstra, Ronnie
name: Teillet-Billy, Dominique
name: Morisset, Sabine
name: Spaans, Marco
name: Schlathölter, Thomas
Publisher: name: arXiv
Year: 2016
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The understanding of hydrogen attachment to carbonaceous surfaces is essential to a wide variety of research fields and technologies such as hydrogen storage for transportation, precise localization of hydrogen in electronic devices and the formation of cosmic H2. For coronene cations as prototypical Polycyclic Aromatic Hydrocarbon (PAH) molecules, the existence of magic numbers upon hydrogenation was uncovered experimentally. Quantum chemistry calculations show that hydrogenation follows a site-specific sequence leading to the appearance of cations having 5, 11, or 17 hydrogen atoms attached, exactly the magic numbers found in the experiments. For these closed-shell cations, further hydrogenation requires appreciable structural changes associated with a high transition barrier. Controlling specific hydrogenation pathways would provide the possibility to tune the location of hydrogen attachment and the stability of the system. The sequence to hydrogenate PAHs, leading to PAHs with magic numbers of H atoms attached, provides clues to understand that carbon in space is mostly aromatic and partially aliphatic in PAHs. PAH hydrogenation is fundamental to assess the contribution of PAHs to the formation of cosmic H2.
description: Published in Scientific reports from Nature publishing group
Influence of Diffusion Parameters on Electronic Quality of Multicrystalline Silicon
Creators: name: Gindner, S.
name: Dastgheib-Shirazi, A.
name: Junge, J.
name: Seren, S.
name: Hahn, G.
Publisher: name: WIP
Year: 2011
Subjects: Wafer-based Silicon Solar Cells and Materials Technology
Silicon Solar Cell Improvements

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 1313-1318
description: The presented work deals with phosphorus diffusion gettering of mc material. A significant
improvement of electronic material quality after diffusion is reported. Additionally to POCle diffusion some wafers
undergo deposition and firing of PECVD SiNx to study hydrogen passivation and to allow for a better comparability
to solar cell results. Spatially resolved μPCD lifetime measurements provide insight into how various defect types
react to different diffusion processes. 2x2 cm2 solar cells produced in a photolithography based cell process allow
detailed analysis of different defect regions. The interstitial iron content is lowered under the detection limit after
POCl3-diffusion. Both lifetime measurements and cell results indentify the diffusion process with low unloading
temperature as the optimum one among processes without additional holding step at unloading temperature.
Comparing processes with holding time at unloading temperature, the reference diffusion with higher unloading
temperature turns out to be the best one.
Performance Ratio Revisited: Are PR >90% Realistic?
Creators: name: Reich, N.H.
name: Müller, B.
name: Armbruster, A.
name: Kiefer, K.
name: Van Sark, W.G.J.H.M.
name: Reise, C.
Publisher: name: WIP
Year: 2011
Subjects: PV Systems
Large PV Power Plants and Distributed PV: System Aspects and Grid Connection

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 3922-3929
description: In this study, we investigate the Performance Ratio (PR) of about 100 German PV system installations.
Annual PRSi for the ~100 systems are found to be ~70%...~90% for year 2010, with a median of ~84%. Monitored
PR are found to be systematically lower by ~2%…4% when calculated with irradiation data obtained by
pyranometers (henceforth PRPyr) as compared with irradiation amounts measured by reference cells (denoted PRSi).
Simulations were performed to determine loss mechanisms of the top ten performing systems, revealing a number of
these loss mechanisms may still allow for some optimization. Despite the fact that we do not see such values from our
monitoring data base up to now, we believe PRSi values above 90% are realistic even today, using todays
commercially available components, and should be expected more frequently in the future for systems in which
temperature and irradiation conditions are similar to those prevailing in Germany. This contribution may help in
deepening our knowledge on both energy loss mechanisms and efficiency limits on the system level and
standardization processes of system aspects.
Improved Manufacturing of Back Contact Solar Cells
Creators: name: Montalbán, C.
name: Otaegi, A.
name: Freire, I.
name: Martín Real, J.
name: Lago, R.
name: Jimeno, J.C.
name: Uzin, I.
Publisher: name: WIP-Munich
Year: 2010
Subjects: Wafer-Based Silicon Solar Cells and Materials Technology
Mono- and Multicrystalline Silicon Materials and Cells

description: 25th European Photovoltaic Solar Energy Conference and Exhibition / 5th World Conference on Photovoltaic Energy Conversion, 6-10 September 2010, Valencia, Spain; 2558-2561
description: This paper analyzes the effect of the shape of holes on the series resistance of the metallization wrap
through (MWT) solar cell, just as the possibility of the use of the laser technology for the bus-bars isolation on the
rear side of the cell.
Silicon Ink  Selective Emitter Solar Cells Optimized for Integration in Modules
Creators: name: Meisel, A.
name: Inns, D.
name: Burrows, M.
name: Terry, M.
name: Harwood, D.
name: McIntosh, K.R.
name: Ma, Y.
name: Narayanan, S.
name: Antoniadis, H.
name: Lemmi, F.
Publisher: name: WIP
Year: 2011
Subjects: Wafer-based Silicon Solar Cells and Materials Technology
Silicon Solar Cell Improvements

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 1257-1261
description: DuPont Innovalight’s CougarTM Platform is a selective emitter (SE) process based on a screen-printed
pattern of Silicon Ink. This report presents the optimization of the Cougar cell for photovoltaic (PV) modules. Raytracing
modeling has been used to optimize the performance of encapsulated Cougar cells, taking into account the
optical properties of surface texture, encapsulant materials, and cell anti-reflection coating layers. Anti-reflection
coatings are made from silicon nitride (SiNx), the optical characteristics of which were determined from ellipsometry
and UV-Vis spectroscopy. Modeling predicts different cell-to-module (CTM) performance ratios for short-circuit current
(Isc), depending on the SiNx characteristics. Mini-modules were constructed to verify modeling results. In addition
to optical modeling, fill factor losses in the mini-modules are investigated and analyzed. Accelerated lifetime
testing was also performed. The Cougar Platform shows equivalent reliability performance compared to traditional,
homogeneous emitter (HE) solar cells.
The Influence of Different n-Type Semiconductors on Solid State Solar Cells with CuInS2 p-Type Absorber
Creators: name: Popovici, I.
name: Perniu, D.
name: Isac, L.
name: Enesca, A.
name: Duta, A.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Thin Films Solar Cells
CIS and Other (II-VI) Ternary Thin Film Solar Cells

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 3020-3023
description: The solid state solar cells represent a viable option for low cost, efficient PVs, mainly combined with solar
concentrating systems. Their market spread is conditioned by the development of devices with a comparable efficiency
with the state of the art silicon PV cells. Therefore, the target set is to increase the conversion efficiency, thus optimizing
the materials and the hetero-junction. The paper presents a comparative study on 3D solid state solar cells, based on
anatase and ZnO hetero-junction with CIS, with and without a In2S3 buffer layer. The buffer layer is responsible for
limiting charge recombination and for tuning the Fermi levels. The results prove that the morphology fit among the
semiconductors plays a key role in the cell efficiency and the use of ZnO is limited by the particular, worm like
morphology. Good results are reported for cells based on anatase as n-type semiconductor, with dense and
dense/nanoporous structure.
Novel solid-phase epitaxy for multi-component materials with extremely high vapor pressure elements: An application to KFe2As2
Creators: name: Hatakeyama, Taisuke
name: Sato, Hikaru
name: Hiramatsu, Hidenori
name: Kamiya, Toshio
name: Hosono, Hideo
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We propose a novel solid-phase epitaxy technique applicable to high annealing temperatures up to 1000 C without re-vaporization of alkali metal elements with high vapor pressures. This technique is demonstrated through the successful growth of high-quality KFe2As2 epitaxial films. The key factors are employing a custom-designed alumina vessel/cover and sealing it in a stainless tube with a large amount of atmospheric KFe2As2 powder in tightly closed sample spaces. This technique can also be effective for other materials composed of elements with very high vapor pressures, such as alkali metals, and can lead to the realization of spintronics devices in the future using KFe2As2.
A variance reduced estimator of the connected two-point function in the presence of a broken Z_2 symmetry
Creators: name: Hasenbusch, Martin
Publisher: name: arXiv
Year: 2015
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: The exchange or geometric cluster algorithm allows us to define a variance reduced estimator of the connected two-point function in the presence of a broken Z_2-symmetry. We present first numerical tests for the improved Blume-Capel model on the simple cubic lattice. We perform simulations for the critical isotherm, the low temperature phase at vanishing external field and, for comparison, also the high temperature phase. For the connected two-point function a substantial reduction of the variance can be obtained, allowing us to compute the correlation length with high precision. Based on these results, estimates for various universal amplitude ratios that characterise the universality class of the three-dimensional Ising model are computed.
description: 28 pages
Holomorphic extensions associated with series expansions
Creators: name: De Micheli, Enrico
name: Viano, Giovanni Alberto
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mathematical Physics (math-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences
subject: 30B10, 30B40, 42A32, 81T28

description: We study the holomorphic extension associated with power series, i.e., the analytic continuation from the unit disk to the cut-plane $\mathbb{C} \setminus [1,+\infty)$. Analogous results are obtained also in the study of trigonometric series: we establish conditions on the series coefficients which are sufficient to guarantee the series to have a KMS analytic structure. In the case of power series we show the connection between the unique (Carlsonian) interpolation of the coefficients of the series and the Laplace transform of a probability distribution. Finally, we outline a procedure which allows us to obtain a numerical approximation of the jump function across the cut starting from a finite number of power series coefficients. By using the same methodology, the thermal Green functions at real time can be numerically approximated from the knowledge of a finite number of noisy Fourier coefficients in the expansion of the thermal Green functions along the imaginary axis of the complex time plane.
description: 38 pages, 4 figures
Characterisation of a TES-Based X-ray Microcalorimeter in the Energy Range from 150 to 1800 eV Using an Adiabatic Demagnetisation Refrigerator
Creators: name: Gottardi, Luciano
name: Takei, Yoh
name: van der Kuur, Jan
name: de Korte, Piet A. J.
name: Hoevers, Henk F. C.
name: Boersma, Dirk
name: Bruijn, Marcel
name: Mels, Wim
name: Ridder, Marcel L.
name: Takken, Dick
name: van Weers, Henk
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Superconductivity (cond-mat.supr-con)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We characterised a TES-based X-ray microcalorimeter in an adiabatic demagnetisation refrigerator (ADR) using synchrotron radiation. The detector response and energy resolution was measured at the beam-line in the PTB radiometry laboratory at the electron storage ring BESSY II in the range from 200 to 1800 eV. We present and discuss the results of the energy resolution measurements as a function of energy, beam intensity and detector working point. The measured energy resolution ranges between 1.5 to 2.1 eV in the investigated energy range and is weakly dependent on the detector set point. A first analysis shows a count-rate capability, without considerable loss of performance, of about 500 counts per second.
description: 6 pages, 5 figures, Proceedings of the 12th International Workshop on Low Temperature Detectors (LTD12)
The Alternating Current Equivalent Circuit for CIGS-Based PV Modules
Creators: name: Werner, B.
name: Dudek, M.
name: Nitsch, K.
name: Kołodenny, W.
name: Dziedzic, A.
name: Zdanowicz, T.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Thin Films Solar Cells
CIS and Other (II-VI) Ternary Thin Film Solar Cells

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 3041-3044
description: In the paper results of determined the alternating current (ac) equivalent circuit for CIGS-based thinfilm
PV modules working in natural outdoor conditions are presented. The electrical behaviour of II-(III)-VI thinfilm
PV cells/modules is influenced mainly by the defect layers located at the buffer/absorber interface and in the
bulk of depletion region. Impedance spectroscopy was used to characterize the bulk and interface levels in the
absorber CIGS layer.
Electroluminescence (EL) and Infrared (IR) Methods for Characterizing Different Module Technologies
Creators: name: Ebner, R.
name: Zamini, S.
name: Kubicek, B.
name: Újvári, G.
name: Novalin, S.
Publisher: name: WIP
Year: 2011
Subjects: Components for PV Systems
PV Modules

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 3279-3284
description: The aim of this work was the comparison of different quality assurance methods for different module
technologies (e.g. crystalline and thin film technologies). For a complete quality control of PV modules a
combination of fast and non-destructive methods was investigated. Camera-based measurements, like
electroluminescence (EL) and Infrared-Technologies (IR) offer excellent possibilities to determine production
failures or defects in solar modules, which can not be detected by means of standard power measurements. EL is
already an important characterization tool in industry and research. Applications are strong in quality control and
development support.
Most short circuits reduce the voltage in their surrounding area and appear dark in EL-images. However as this
feature is not always clear, short circuits are only definitely identifiable in combination with IR-measurements.
Therefore, for a fast detection of the most common defects in a PV module with high resolution, a combination of EL
and IR measurements is advisable.
Front Side Metallization for Crystalline Solar Cells with Electro-Less Nickel Plating
Creators: name: Bähr, M.
name: Heinrich, G.
name: Nieland, S.
name: Lawerenz, A.
Publisher: name: WIP-Munich
Year: 2010
Subjects: Wafer-Based Silicon Solar Cells and Materials Technology
Mono- and Multicrystalline Silicon Materials and Cells

description: 25th European Photovoltaic Solar Energy Conference and Exhibition / 5th World Conference on Photovoltaic Energy Conversion, 6-10 September 2010, Valencia, Spain; 2565-2568
description: This paper presents the results of an electro-less nickel plating on industrial-type substrates. A homogeneous Ni-film with a
thickness of 1-2 μm has reproducible been deposited, after initial optimization of preconditioning. As crucial steps the
preconditioning using different acids and the effect of patterning were investigated, with focus on the latter. In this context,
patterning by means of etching pastes and laser ablation with different fluences were varied. The prepared samples were
investigated in terms of homogenity, electrical performance and adhesion. For the laser ablated samples, the results suggest a
possibility of a moderate process window, whereas for the etching paste patterned samples the adhesion of the deposited
films was poor.
Estimating Annual Synchronized 1-Min Power Output Profiles from Utility-Scale PV Plants at 10 Locations in Nevada for a Solar Grid Integration Study
Creators: name: Stein, J.S.
name: Hansen, C.W.
name: Ellis, A.
name: Chadliev, V.
Publisher: name: WIP
Year: 2011
Subjects: PV Systems
Large PV Power Plants and Distributed PV: System Aspects and Grid Connection

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 3874-3880
description: We present an approach to simulate time-synchronized, one-minute power output from large
photovoltaic (PV) generation plants in locations where only hourly irradiance estimates are available from satellite
sources. The approach uses one-minute irradiance measurements from ground sensors in a climatically and
geographically similar area. Irradiance is translated to power using the Sandia Array Performance Model. Power
output profiles generated for 2007 in southern Nevada are being used for a Solar PV Grid Integration Study to
estimate the integration costs associated with various utility-scale PV generation levels. Plant designs considered
include both fixed-tilt thin-film, and single-axis-tracked polycrystalline Si systems ranging in size from 5 to 300
MWAC. Simulated power output profiles at one-minute intervals were generated for five scenarios defined by total
PV capacity (149.5 MW, 222 WM, 292 MW, 492 MW, and 892 MW) each comprising as many as 10 geographically
separated PV plants.
Searching for Cool Dust in the Mid-to-Far Infrared: the Mass Loss Histories of The Hypergiants $μ$ Cep, VY CMa, IRC+10420, and $ρ$ Cas
Creators: name: Shenoy, Dinesh
name: Humphreys, Roberta M.
name: Jones, Terry Jay
name: Marengo, Massimo
name: Gehrz, Robert D.
name: Helton, L. Andrew
name: Hoffmann, William F.
name: Skemer, Andrew J.
name: Hinz, Philip M.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present mid- and far- IR imaging of four famous hypergiant stars: the red supergiants $μ$ Cep and VY CMa, and the warm hypergiants IRC +10420 and $ρ$ Cas. Our 11 to 37 $μ$m SOFIA/FORCAST imaging probes cool dust not detected in visual and near-IR imaging studies. Adaptive optics (AO) 8 - 12 $μ$m imaging of $μ$ Cep and IRC +10420 with MMT/MIRAC reveals extended envelopes that are the likely sources of these stars' strong silicate emission features. We find $μ$ Cep's mass-loss rate to have declined by about a factor of 5 over a 13,000 history, ranging from 5 $\times$ 10$^{-6}$ down to $\sim$1 $\times$ 10$^{-6}$ $M_{\odot}$ yr$^{-1}$. The morphology of VY CMa indicates a cooler dust component coincident with the highly asymmetric reflection nebulae seen in the visual and near-IR. The lack of cold dust at greater distances around VY CMa indicates its mass-loss history is limited to the last $\sim$1200 years, with an average rate of 6 $\times$ 10$^{-4}$ $M_{\odot}$ yr$^{-1}$. We find two distinct periods in the mass-loss history of IRC +10420 with a high rate of 2 $\times$ 10$^{-3}$ $M_{\odot}$ yr$^{-1}$ until approximately 2000 yr ago, followed by an order of magnitude decrease in the recent past. We interpret this change as evidence of its evolution beyond the RSG stage. Our new infrared photometry of $ρ$ Cas is consistent with emission from the expanding dust shell ejected in its 1946 eruption, with no evidence of newer dust formation from its more recent events.
description: Accepted by the Astronomical Journal on 2015 Dec 03