cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Two-Step Plasma Texturing Process for Industrial Solar Cell Manufacturing
Creators: name: Seiffe, J.
name: Bremen, B.
name: Rappl, S.
name: Hofmann, M.
name: Rentsch, J.
Publisher: name: WIP
Year: 2013
Subjects: WAFER-BASED SILICON SOLAR CELLS AND MATERIALS TECHNOLOGY
Silicon Solar Cell Improvements

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 1201-1204
description: This study describes the development of a two-step SF6/O2 texturing process using an inline industrialtype
plasma system with combined microwave and radiofrequency excitation. It is shown that efficient texturing of
polished (100), (111) and multicrystalline surfaces is possible. Multicrystalline silicon solar cells are processed
proving an average efficiency gain of 0.2 % absolute compared to standard acidic texturing. With an improved surface
passivation even a gain of 0.4 % absolute is achieved.
Firing-Stable and Blister-Free Spatial ALD Al2O3-SiNx Stack for Industrial PERC Solar Cells
Creators: name: Souren, F.M.M.
name: Dielissen, B.
name: Gay, X.
name: Görtzen, R.
name: Jiang, X.
name: Ban, W.
name: Shan, W.
name: Hoyer, R.
name: Mao, X.
name: Qu, X.
Publisher: name: WIP
Year: 2013
Subjects: WAFER-BASED SILICON SOLAR CELLS AND MATERIALS TECHNOLOGY
Silicon Solar Cell Improvements

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 1251-1254
description: We have studied the passivation effect of ALD Al2O3/SiNx stacks as a function of H2O concentration
during atomic layer deposition (ALD), with and without post-deposition annealing. Firing-stable and blister-free
ALD Al2O3/SiNx stacks with implied Voc values larger than 700 mV can be relatively easy achieved if post-ALD
annealing is employed. While blistering has been observed in the ALD Al2O3/SiNx stacks without post-deposition
annealing. The number of blisters is found to be proportional to the H2O concentration in the ALD recipe used for
Al2O3 deposition. By controlling H2O concentration at a reasonable level in the mixture of precursors, good
passivation of Al2O3 to Si surface can be obtained with implied Voc up to 680 mV with no post-deposition annealing
being applied.
Mass Production of High-Efficiency MWT Solar Cells via Ion Implantation
Creators: name: Liu, Y.
name: Woo, J.
name: Wang, X.-S.
name: Zhang, L.
Publisher: name: WIP
Year: 2013
Subjects: WAFER-BASED SILICON SOLAR CELLS AND MATERIALS TECHNOLOGY
Silicon Solar Cell Improvements

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 1120-1122
description: As the development of PV industry, ion implantation is introduced into solar cell fabrication to further
improve the conversion efficiency. This technology can simplify the traditional solar cell fabrication process and
realize some novel PV structures. In this report, ion implantation was used to fabricate high-efficiency metal wrap
through solar cells. The process was much simplified by eliminating the phosphor-silicate glass removal and edgeisolation.
Employing ion implantation, homogeneous phosphorus doped emitter with standard deviation of sheet
resistance lower than 4/sq. was obtained, and the doping profiles were controlled very well. After optimizing the
ion dose and annealing recipe, average 19.79% and champion 19.94% solar cell efficiency was achieved in our pilot
line.
Waveforms in massive gravity and neutralization of giant black hole ringings
Creators: name: Décanini, Yves
name: Folacci, Antoine
name: Hadj, Mohamed Ould El
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A distorted black hole radiates gravitational waves in order to settle down in a smoother geometry. During that relaxation phase, a characteristic damped ringing is generated. It can be theoretically constructed from both the black hole quasinormal frequencies (which govern its oscillating behavior and its decay) and the associated excitation factors (which determine intrinsically its amplitude) by carefully taking into account the source of the distortion. In the framework of massive gravity, the excitation factors of the Schwarzschild black hole have an unexpected strong resonant behavior which, theoretically, could lead to giant and slowly decaying ringings. If massive gravity is relevant to physics, one can hope to observe these extraordinary ringings by using the next generations of gravitational wave detectors. Indeed, they could be generated by supermassive black holes if the graviton mass is not too small. In fact, by focusing on the odd-parity $\ell=1$ mode of the Fierz-Pauli field, we shall show here that such ringings are neutralized in waveforms due to (i) the excitation of the quasibound states of the black hole and (ii) the evanescent nature of the particular partial modes which could excite the concerned quasinormal modes. Despite this, with observational consequences in mind, it is interesting to note that the waveform amplitude is nevertheless rather pronounced and slowly decaying (this effect is now due to the long-lived quasibound states). It is worth noting also that, for very low values of the graviton mass (corresponding to the weak instability regime for the black hole), the waveform is now very clean and dominated by an ordinary ringing which could be used as a signature of massive gravity.
description: v1:We complete our work on resonant excitation of BHs in massive gravity (see arXiv:1401.0321[gr-qc] and arXiv:1402.2481[gr-qc]) and discuss more particularly the observability of giant ringings. v2:With additional remarks concerning waveforms corresponding to the weak instability regime. (To appear in PRD). v3:Close to the published version
Aspects of noncommutativity and holography in field theory and string theory
Creators: name: Sieg, Christoph
Publisher: name: Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I
Year: 2005
Subjects: subject: nichtkommutative Yang-Mills-Theorie
subject: Feynman-Regeln
subject: AdS/CFT- und BMN-Korrespondenz
subject: holgraphisches Prinzip
subject: noncommutative Yang-Mills theory
subject: Feynman rules
subject: AdS/CFT and BMN correspondence
subject: holographic principle
subject: 530 Physik
subject: 29 Physik, Astronomie

description: Die Arbeit beschäftigt sich mit zwei Themen: den nichtkommutativen Yang-Mills-Theorien und der AdS/CFT-Korrespondenz. Im ersten Teil wird eine teilweise Aufsummation der theta-entwickelten Störungstheorie untersucht. Letztere stellt einen Weg dar, nichtkommutative Yang-Mills-Theorien mit beliebigen Eichgruppen G als Störungsentwicklung im Nichtkommutativitätsparameter theta zu definieren. Es wird gezeigt, daß man im Fall, daß G eine echte Untergruppe von U(N) ist, die ungleich einer U(M) ist (M
description: This thesis addresses two topics: noncommutative Yang-Mills theories and the AdS/CFT correspondence. In the first part we study a partial summation of the theta-expanded perturbation theory. The latter allows one to define noncommutative Yang-Mills theories with arbitrary gauge groups G as a perturbation expansion in the noncommutativity parameter theta. We show that for G being a subset of U(N) but not equal to U(M), M
Silicon Heterojunction for Advanced Rear Contact Cells: Main Results of the SHARCC Project
Creators: name: Desrues, T.
name: Martín, I.
name: De Vecchi, S.
name: Abolmasov, S.
name: Diouf, D.
name: Lukyanov, A.
name: Ortega, P.
name: Colina Brito, M.
name: Versavel, M.
name: Tusseau, M.
name: Souche, F.
name: Nychyporuk, T.
name: Gueunier-Farret, M.E.
name: Muñoz, D.
name: Lemiti, M.
name: Kleider, J.-P.
name: Roca I Cabarrocas, P.
name: Alcubilla González, R.
name: Schlumberger, Y.
name: Ribeyron, P.-J.
Publisher: name: WIP
Year: 2013
Subjects: WAFER-BASED SILICON SOLAR CELLS AND MATERIALS TECHNOLOGY
Silicon Solar Cell Improvements

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 1135-1138
description: This paper presents the main results of a research project called SHARCC, focused on rear contacted
silicon heterojunction solar cells. Within this project, funded by the French National Research Agency (ANR),
different tasks were shared by the partners taking into account their specific skills. This project led to efficiencies about
19% on innovative cell structures obtained with an industrial process based on laser ablation.
Efficient state initialization by a quantum spectral filtering algorithm
Creators: name: Fillion-Gourdeau, F.
name: MacLean, S.
name: Laflamme, R.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: An algorithm that initializes a quantum register to a state with a specified energy range is given, corresponding to a quantum implementation of the celebrated Feit-Fleck method. This is performed by introducing a nondeterministic quantum implementation of a standard spectral filtering procedure combined with an apodization technique, allowing for accurate state initialization. It is shown that the implementation requires only two ancilla qubits. A lower bound for the total probability of success of this algorithm is derived, showing that this scheme can be realized using a finite, relatively low number of trials. Assuming the time evolution can be performed efficiently and using a trial state polynomially close to the desired states, it is demonstrated that the number of operations required scales polynomially with the number of qubits. Tradeoffs between accuracy and performance are demonstrated in a simple example: the harmonic oscillator. This algorithm would be useful for the initialization phase of the simulation of quantum systems on digital quantum computers.
description: 12 pages, 4 figures, revised version
Investigation on PID-Resistant Anti-Reflection Coating for Crystaline Silicon Solar Cells
Creators: name: Mishina, K.
name: Ogishi, A.
name: Ueno, K.
name: Imai, D.
name: Saruwatari, T.
name: Yamazaki, T.
name: Doi, T.
name: Hara, K.
name: Ikeno, N.
name: Ogura, A.
name: Masuda, A.
Publisher: name: WIP
Year: 2013
Subjects: WAFER-BASED SILICON SOLAR CELLS AND MATERIALS TECHNOLOGY
Silicon Solar Cell Improvements

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 1139-1143
description: Anti-reflection coating (ARC) on crystalline silicon solar cell plays an important role in preventing
potential induced degradation (PID). It is reported that PID is suppressed with simply increasing the refractive index
(RI) of silicon nitride (SiN) film as ARC. However, this method has a disadvantage in initial conversion efficiency
because of dropping the optical confinement. In this paper, we report an investigation about PID-resistant ARC with
keeping conventional RI. The module, which has an ARC deposited by a novel plasma enhanced chemical vapor
deposition (PE-CVD) unit “MCXS” from Shimadzu Corporation, indicated high resistance to PID without optical
confinement loss. We describe the electrical and chemical properties of the PID-resistant ARC.
Untersuchungen zur Züchtung variegater Pelargonium x zonale-Hybriden auf tetraploider Stufe
Creators: name: Grieger, Patrick
Publisher: name: Humboldt-Universität zu Berlin, Landwirtschaftlich-Gärtnerische Fakultät
Year: 2007
Subjects: subject: Pelargonium
subject: Variegation
subject: Chimäre
subject: Ploidie
subject: variegation
subject: chimera
subject: ploidy
subject: 630 Landwirtschaft, Veterinärmedizin
subject: 39 Landwirtschaft, Garten
subject: ZC 52000

description: Die vorliegende Arbeit befasst sich mit züchtungsmethodischen Untersuchungen zur Schaffung blattvariegater Pelargonium x zonale-Hybriden auf tetraploidem Leistungsstand. Basierend auf dem Wirkstoff Trifluralin konnte eine effektive Behandlungsvariante zur somatischen Polyploidisierung periklinalchimärischer Pelargonium x zonale-Klone etabliert werden. Unter Ausnutzung biparentaler Erbgänge wurden fünf ausgewählte Plasmotypen an das Leistungsniveau moderner Sortimente herangeführt. Daneben erbrachten Kreuzungen innerhalb der Sektion Ciconium hybridvariegate F1-Pflanzen. Die Möglichkeit der Ausnutzung von Kern-Plasma-Wechselwirkungen in der Pelargonienzüchtung wird diskutiert. Im Hinblick auf den Aufbau eines Protoplastenregenerationssystems konnten Zellsuspensionskulturen etabliert werden. Im Anschluss an enzymatische Verdauungen wurde die Regeneration von Kallus beobachtet. Variegate Pflanzen aus Mutationsversuchen mit NMH (Nitroso-Methyl-Harnstoff), einer weiteren experimentellen Variante, erwiesen sich als steril, so dass eine weiterführende Züchtungsarbeit auf diesem Weg bisher noch nicht möglich war
description: The study analyzes breeding schemes concerning the development of variegated tetraploid Pelargonium x zonale-hybrids (Pelargonium x hortorum). With a focus on practical relevance breeding methods for periclinal chimeric leaf patterns are discussed. Trifluralin-induced tetraploid Pelargonium x zonale-hybrids were successfully crossed with modern cultivars. Via biparental mode of inheritance five defined plasmotypes were transfered to the karyological background of current high-performance Pelargonium series. In a crossing-program within the section Ciconium hybrid-variegation was detected. The possibility of using nucleo-plasmatic interactions in developing new Pelargonium cultivars is discussed. First steps concerning a biotechnological approach to create variegated plants included the establishment of cell-suspension-cultures as the base for a protoplast regeneration system. Following the enzymatic digestion of Pelargonium-liquid cultures up to now, callus regeneration was achieved. Variegated plants resulting from mutagenic treatments with NMU (Nitroso-methylurea) proved to be sterile.
Excimer Laser Annealing for Boron Implanted Local BSF for PERC Crystalline Silicon Solar Cells
Creators: name: Uruena, A.
name: Lerat, J.F.
name: Emeraud, T.
name: Tous, L.
name: Duerinckx, F.
name: John, J.
name: Poortmans, J.
name: Mertens, R.
Publisher: name: WIP
Year: 2013
Subjects: WAFER-BASED SILICON SOLAR CELLS AND MATERIALS TECHNOLOGY
Silicon Solar Cell Improvements

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 1144-1147
description: In this work, the activation of an implanted boron (B) junction by an Excimer Laser Annealing (ELA)
process is investigated. The objective is to substitute the standard Aluminium Back Surface Field (Al-BSF) normally
used at the rear side of PERC cells by a Boron-BSF, taking advantage of the higher solubility of B in Si compared to
Al. The long annealing step used to re-crystallize the amorphized region after implantation is usually performed in an
oven at high temperature. In this study, we replaced it by the ELA based on a system from Excico. The laser has a
150 ns pulse duration, a wavelength of 308 nm, a top-hat beam profile with excellent energy uniformity (±2%) and an
annealing area up to 400 mm2. The samples are analysed by sheet resistance, SIMS profiles and lifetime/J0e for
different laser energy densities and implantation conditions (dose and energy), suggesting process conditions for a BBSF
implementation. The B-BSF formed by implantation and subsequent ELA shows sheet resistance values as low
as 20 Ohm/sq, J0e values down to 200 fA/cm2 and dopant profiles with surface concentration higher than 1020 at/cm3.
Small Mass Limit of a Langevin Equation on a Manifold
Creators: name: Birrell, Jeremiah
name: Hottovy, Scott
name: Volpe, Giovanni
name: Wehr, Jan
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We study damped geodesic motion of a particle of mass $m$ on a Riemannian manifold, in the presence of an external force and noise. Lifting the resulting stochastic differential equation to the orthogonal frame bundle, we prove that, as $m \to 0$, its solutions converge to solutions of a limiting equation which includes a {\it noise-induced drift} term. A very special case of the main result presents Brownian motion on the manifold as a limit of inertial systems.
description: 48 pages
Introduction to graded geometry
Creators: name: Fairon, Maxime
Publisher: name: arXiv
Year: 2015
Subjects: subject: Differential Geometry (math.DG)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 58A50, 51-02

description: This paper aims at setting out the basics of $\mathbb{Z}$-graded manifolds theory. We introduce $\mathbb{Z}$-graded manifolds from local models and give some of their properties. The requirement to work with a completed graded symmetric algebra to define functions is made clear. Moreover, we define vector fields and exhibit their graded local basis. The paper also reviews some correspondences between differential Z-graded manifolds and algebraic structures.
description: 15 pages, to appear in European Journal of Mathematics
Effect of Surface Roughness Conditions on Rear Passivated Solar Cells
Creators: name: Huang, J.-R.
name: Cheng, W.-C.
name: Wu, I.-H.
name: Chen, S.H.T.
name: Cheng, L.-W.
Publisher: name: WIP
Year: 2013
Subjects: WAFER-BASED SILICON SOLAR CELLS AND MATERIALS TECHNOLOGY
Silicon Solar Cell Improvements

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 1090-1092
description: The effect of surface roughness conditions on rear passivated solar cell performance has been discussed,
in terms of passivation performance and local contact formation. From the normalized photoluminescence (PL)
measurements for the PERC solar cells and the passivated samples, the deteriorated passivation quality of passivated
films is observed on the samples with rougher rear surface condition. From the cross-section images of scanning
electron microscopy (SEM), the local contact structures with the thin and discontinuous LBSF layer, especially at
void-like contacts, are observed on the rough surface samples. Besides, the 20.12% efficiency PERC solar cells are
achieved at the moderate rear surface roughness condition, which can enable an optimized combination of the
retaining passivation quality and proper local contact formation property.
Silicon Surface Passivation by Al2O3 Films Grown by Spatial Atomic Layer Deposition Using Low-Cost Precursors
Creators: name: Nandakumar, N.
name: Lin, F.
name: Dielissen, B.
name: Souren, F.M.M.
name: Gay, X.
name: Görtzen, R.
name: Duttagupta, S.
name: Aberle, A.G.
name: Hoex, B.
Publisher: name: WIP
Year: 2013
Subjects: WAFER-BASED SILICON SOLAR CELLS AND MATERIALS TECHNOLOGY
Silicon Solar Cell Improvements

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 1105-1107
description: A key concern for the integration of Al2O3 films deposited by atomic layer deposition (ALD) in the
photovoltaic industry is its high cost of precursors. This cost can be reduced by replacing conventional semiconductorgrade
trimethylaluminium (TMA) with cheaper solar-grade TMA. In this study, Al2O3 films were grown on SoLayTec’s
InPassion LAB spatial ALD reactor and the level of surface passivation was investigated on both n-type and p-type
Czochralski-grown silicon wafers. High effective lifetimes were obtained for Al2O3 films deposited by both grades of
TMA, with little difference between the two. Further investigations revealed a lower interface defect density for solargrade
TMA and only very small differences in the fixed charge density between the two grades of TMA. These results
show that low-cost solar-grade TMA can be utilised for the passivation of n-type and p-type c-Si surfaces.
Fundamental limits to collective concentration sensing in cell populations
Creators: name: Fancher, Sean
name: Mugler, Andrew
Publisher: name: arXiv
Year: 2016
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Molecular Networks (q-bio.MN)
subject: Tissues and Organs (q-bio.TO)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: The precision of concentration sensing is improved when cells communicate. Here we derive the physical limits to concentration sensing for cells that communicate over short distances by directly exchanging small molecules (juxtacrine signaling), or over longer distances by secreting and sensing a diffusive messenger molecule (autocrine signaling). In the latter case, we find that the optimal cell spacing can be large, due to a tradeoff between maintaining communication strength and reducing signal cross-correlations. This leads to the surprising result that autocrine signaling allows more precise sensing than juxtacrine signaling for sufficiently large populations. We compare our results to data from a wide variety of communicating cell types.
description: 29 pages, 3 figures
Safe and Inexpensive Al2O3 Deposited by APCVD with Single-Source Precursor
Creators: name: Black, L.
name: Allen, T.
name: McIntosh, K.R.
Publisher: name: WIP
Year: 2013
Subjects: WAFER-BASED SILICON SOLAR CELLS AND MATERIALS TECHNOLOGY
Silicon Solar Cell Improvements

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 1068-1072
description: Al2O3 is well known to provide excellent silicon surface passivation, but current deposition techniques
are relatively expensive and hazardous due to the use of pyrophoric trimethylaluminium (TMA) as the chemical
precursor. We demonstrate the use of an inexpensive, non-pyrophoric, liquid, metal-organic compound, aluminium
tri-(sec-butoxide) (ATSB), as a chemical precursor to deposit Al2O3 films via atmospheric pressure chemical vapour
deposition (APCVD). This material is available at approximately a third of the cost of TMA. It is shown that Al2O3
films deposited from ATSB provide surface passivation comparable to those deposited using other precursors and
deposition techniques, and more than sufficient for effective surface passivation of high efficiency solar cells.
Additionally, the ability of ATSB to act as a single-source precursor for Al2O3 deposition enables substantial
simplification of the APCVD deposition system, which should further reduce cost of ownership. This property also
facilitates an increase in the precursor delivery rate via several means, which offsets the disadvantage of ATSB’s
relatively low vapour pressure.
Primal-dual method for searching equillibriums in mixed traffic assignment problems
Creators: name: Gasnikov, Alexander
name: Gasnikova, Evgenia
name: Nesterov, Yurii
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: We consider mixed model of traffic flow distribution in large networks (BMW model, 1954 & Stable Dynamic model, 1999). We build dual problem and consider primal-dual mirror descent method for the dual problem. There are two ways to recover the solution of the primal problem. First technique is based on "models" approach and second one is based on Lagrange multiplyers technique. Both approaches have its own advantages and drawbacks. We discuss them.
description: 11 pages, in Russian
THEORETICAL OF WHO IS A BELIEVER: ISLAMIC VIEW AND PSYCHOANALYTIC APPROACH
Creators: name: Abidogun, Moruf Adebayo
Publisher: name: figshare
Year: 2022
Subjects: subject: 170106 Health, Clinical and Counselling Psychology
subject: FOS: Psychology

description: The spiritual training of one soul is a strategy and planning. It speaks not only on independence but also liberation. It is about the perseverance and the endurance of an individual. It is subsequently secured, protected and solidified the entity of an individual. The paper examined who is a believer with theoretical Islamic and psychoanalytic approach. The study concisely identified qualities of a good believer as enshrined in the Holy Quran. In furtherance articulated main major mind set as a basis that guided individual towards the genuine and authentic believes. The study analyzed human mind used psychoanalytic dimension to enhance the explanation of the Islamic view of the mind. The study concluded that the superego is the component of personality composed of the internalized ideals that have acquired from the parents and society. The superego works to suppress the urges of the id and tries to make the ego behave morally, rather than realistically. Paper highlighted facts that are recommended to overcome commanding soul
Gluon bound state and asymptotic freedom derived from the Bethe--Salpeter equation
Creators: name: Fukamachi, Hitoshi
name: Kondo, Kei-Ichi
name: Nishino, Shogo
name: Shinohara, Toru
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this paper we study the two-body bound states for gluons and ghosts in a massive Yang-Mills theory which is obtained by generalizing the ordinary massless Yang-Mills theory in a manifestly Lorentz covariant gauge. First, we give a systematic derivation of the coupled Bethe-Salpeter equations for gluons and ghosts by using the Cornwall-Jackiw-Tomboulis effective action of the composite operators within the framework of the path integral quantization. Then, we obtain the numerical solutions for the Bethe-Salpeter amplitude representing the simultaneous bound states of gluons and ghosts by solving the homogeneous Bethe-Salpeter equation in the ladder approximation. We study how the inclusion of ghosts affects the two-gluon bound states in the cases of the standing and running gauge coupling constant. Moreover, we show explicitly that the approximate solutions obtained for the gluon-gluon amplitude are consistent with the ultraviolet asymptotic freedom signaled by the negative $β$ function.
description: Introduction has been a bit modified and Section 7 has been completely revised. This is the version accepted for publication in PTEP
Robust Principal Component Pursuit via Inexact Alternating Minimization on Matrix Manifolds
Creators: name: Hintermüller, M.
name: Wu, T.
Publisher: name: Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät
Year: 2014
Subjects: subject: Matrix decomposition
subject: low-rank matrix
subject: image processing
subject: optimization on manifolds
subject: 510 Mathematik

description: Robust principal component pursuit (RPCP) refers to a decomposition of a data matrix into a low-rank component and a sparse component. In this work, instead of invoking a convex-relaxation model based on the nuclear norm and the `1 -norm as is typically done in this context, RPCP is solved by considering a least-squares problem subject to rank and cardinality constraints. An inexact alternating minimization scheme, with guaranteed global convergence, is employed to solve the resulting constrained minimization problem. In particular, the low-rank matrix subproblem is resolved inexactly by a tailored Riemannian optimization technique, which favorably avoids singular value decompositions in full dimen- sion. For the overall method, a corresponding q-linear convergence theory is established. The numerical experiments show that the newly proposed method compares competitively with a popular convex-relaxation based approach.
Pseudo-exponential maps, variants, and quasiminimality
Creators: name: Bays, Martin
name: Kirby, Jonathan
Publisher: name: arXiv
Year: 2015
Subjects: subject: Logic (math.LO)
subject: FOS: Mathematics
subject: 03C65 (Primary) 12L12, 03C75 (Secondary)

description: We give a construction of quasiminimal fields equipped with pseudo-analytic maps, generalising Zilber's pseudo-exponential function. In particular we construct pseudo-exponential maps of simple abelian varieties, including pseudo-$\wp$-functions for elliptic curves. We show that the complex field with the corresponding analytic function is isomorphic to the pseudo-analytic version if and only the appropriate version of Schanuel's conjecture is true and the corresponding version of the strong exponential-algebraic closedness property holds. Moreover, we relativize the construction to build a model over a fairly arbitrary countable subfield and deduce that the complex exponential field is quasiminimal if it is exponentially-algebraically closed. This property asks only that the graph of exponentiation have non-trivial intersection with certain algebraic varieties but does not require genericity of these points. Furthermore Schanuel's conjecture is not required as a condition for quasiminimality.
description: v3: Substantial improvements to the organisation and presentation
Pyrosol Deposited Gallium Doped Zinc Oxide Thin Films for Crystalline Silicon Solar Cells
Creators: name: Untila, G.G.
name: Kost, T.N.
name: Chebotareva, A.B.
name: Stepanov, A.S.
name: Zaks, M.B.
name: Sitnikov, A.M.
name: Solodukha, O.I.
name: Shevaleevskiy, O.
name: Kuznetsov, L.I.
name: Ivanova, V.M.
Publisher: name: WIP
Year: 2013
Subjects: WAFER-BASED SILICON SOLAR CELLS AND MATERIALS TECHNOLOGY
Silicon Solar Cell Improvements

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 1048-1052
description: The paper presents a study of gallium-doped zinc oxide (GZO) films ~225 and ~370 nm
thick for crystalline silicon solar cell applications. The films were grown by ultrasonic spray pyrolysis at
400 °C in argon on (nn+)Si, (pp+)Si, and (p+nn+)Si structures and microscope slides. The Ga/Zn ratio in the
film-forming solution was varied in the range of 0–15 at.%. The films were annealed for 10 min at 400 °C
in an argon + methanol vapor mixture. We report the morphology of the films, absorption spectra, and resistivity,
the time variation of their resistivity, and the photovoltage of GZO/(nn+)Si, GZO/(pp+)Si, and
GZO/(p+nn+)Si structures.
Key Aspects on Depostion of TCO Material for Heterojunction Solar Cells
Creators: name: Xiong, G.
name: Wang, X.-S.
name: Zhang, L.
Publisher: name: WIP
Year: 2013
Subjects: WAFER-BASED SILICON SOLAR CELLS AND MATERIALS TECHNOLOGY
Silicon Solar Cell Improvements

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 1061-1063
description: We study and compare the performance of two different transparent conducting oxide (TCO) materials
for heterojunction solar cells application. Thin layers of Al-doped Zinc Oxide, Indium Tin Oxide, and other material
doped Indium Oxide are deposited on top of the emitter as a conductive layer to collect photo-generated current. RFmagnetron
sputtering and Reactive Plasma Deposition (RPD) method are utilized for TCO depositions. We
demonstrate that different method, deposition temperature, processing pressure and sputtering power will remarkably
affect the characterization of TCO layers, such as the transmittance and resistivity, so as to definitively affect the
efficiency of heterojunction solar cells. We also investigate other factors that may possibly affect TCO layers’
characteristics or conversion efficiency.
Hydrogen Passivation Mechanisms in Silicon Solar Cells
Creators: name: Hamer, P.
name: Hallam, B.
name: Chan, C.
name: Ciesla, A.
name: Sugianto, A.
name: Abbott, M.
name: Wenham, S.R.
Publisher: name: WIP
Year: 2013
Subjects: WAFER-BASED SILICON SOLAR CELLS AND MATERIALS TECHNOLOGY
Silicon Solar Cell Improvements

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 982-987
description: As new silicon feedstocks for crystalline silicon solar cells are developed the industry
is beginning to confront the challenge of dealing with new impurities. Traditional methods of
hydrogen passivation are shown to be ineffective in passivating some of these defects [1]. Results are
presented showing a clear impact of minority carrier concentration on the effective lifetime of
Upgraded Metallurgical Grade (UMG) silicon after hydrogenation processes. In order to explain this
we present a brief discussion of the interaction of hydrogen charge states with impurities and a simple
model for the prediction of the hydrogen charge states in crystalline silicon. Based on this model we
outline how illumination may be used to increase the concentration of neutral and negatively charged
hydrogen in silicon during hydrogenation processes. We then present results showing that using this
approach the minority carrier lifetime in UMG silicon may be increased by more than a factor of 2
after a low temperature hydrogenation process when compared with the un-illuminated case. This has
important implications for cooling of UMG materials after hydrogenation and for any subsequent
thermal processing.
Process Optimization of Single Step Inkjet Printed Front Contacts for Industrially Fabricated Solar Cells Leads to an Efficiency Gain of 0.3 % abs with Consumption of Less Than 60 Mg Silver
Creators: name: Jesswein, R.
name: Fastnacht, P.
name: Weiß, M.
name: Lossen, J.
name: Meyer, K.
name: Krokoszinski, H.-J.
Publisher: name: WIP
Year: 2013
Subjects: WAFER-BASED SILICON SOLAR CELLS AND MATERIALS TECHNOLOGY
Silicon Solar Cell Improvements

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 997-1003
description: In this work we report on the process optimization of single pass inkjet printed front contacts for
industrially fabricated solar cells. We initially observed locally defined areas of poor contact formation which lead to
inactive areas of the solar cell. Methods were developed to diminish the impact of inhomogeneous contact formation.
With the optimized processing conditions, efficiency gains of 0.2 to 0.4 %abs with Ag-consumption of 50.4 mg have
been demonstrated for different cell architectures with both n- and p-type emitters.
Quasirandom Cayley graphs
Creators: name: Conlon, David
name: Zhao, Yufei
Publisher: name: arXiv
Year: 2016
Subjects: subject: Combinatorics (math.CO)
subject: Group Theory (math.GR)
subject: FOS: Mathematics

description: We prove that the properties of having small discrepancy and having small second eigenvalue are equivalent in Cayley graphs, extending a result of Kohayakawa, Rödl, and Schacht, who treated the abelian case. The proof relies on Grothendieck's inequality. As a corollary, we also prove that a similar result holds in all vertex-transitive graphs.
description: Reformatted for Discrete Analysis
An Empirical Analysis of The Impact of the Exchange Rate on Exports: A Case Study of Mauritania
Creators: name: Elhadj Sabeima
name: Koang Kolang Lam Weal
Publisher: name: Zenodo
Year: 2024

description: The export of a country is one of the main factors indicating its economic health. This study examines the impact of the exchange rate fluctuations on exports in the case of Mauritania by using annual time series data from 1981 to 2017. The Secondary data is taken from the Central Bank of Mauritania and the World Bank Data (WBD). The study uses the Augmented Dickey-Fuller (ADF) test to check the stationarity of the data, Auto Regressive Distributive lag, and Error correction Models to check the long and short-run relationship among the variables. Results of the study show that the exchange rate has a positive and significant impact on Mauritania's exports and that gross domestic product has an impact and can determine the exchange rate. The policy implication based on the findings of the study is that high variability in the exchange rate has a high impact on exports. This indicates that the exchange rate is one of many options for accelerating and determining the trade balance, considering recommendations by Enhancing Structural Reforms to Improve Economic Flexibility, Adjusting Trade Policies to Mitigate the Negative Effects of Exchange Rate Volatility, and Implement Exchange Rate Stabilization Measures.
A Generic Transformation to Enable Optimal Repair in MDS Codes for Distributed Storage Systems
Creators: name: Li, Jie
name: Tang, Xiaohu
name: Tian, Chao
Publisher: name: arXiv
Year: 2016
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: We propose a generic transformation that can convert any nonbinary $(n=k+r,k)$ maximum distance separable (MDS) code into another $(n,k)$ MDS code over the same field such that 1) some arbitrarily chosen $r$ nodes have the optimal repair bandwidth and the optimal rebuilding access, 2) for the remaining $k$ nodes, the normalized repair bandwidth and the normalized rebuilding access (over the file size) are preserved, 3) the sub-packetization level is increased only by a factor of $r$. Two immediate applications of this generic transformation are then presented. The first application is that we can transform any nonbinary MDS code with the optimal repair bandwidth or the optimal rebuilding access for the systematic nodes only, into a new MDS code which possesses the corresponding repair optimality for all nodes. The second application is that by applying the transformation multiple times, any nonbinary $(n,k)$ scalar MDS code can be converted into an $(n,k)$ MDS code with the optimal repair bandwidth and the optimal rebuilding access for all nodes, or only a subset of nodes, whose sub-packetization level is also optimal.
description: This paper has been published in IEEE Transactions on Information Theory
A Passivated Rear Contact for High-Efficiency n-Type Si Solar Cells Enabling High Voc's and FF>82 %
Creators: name: Feldmann, F.
name: Bivour, M.
name: Reichel, C.
name: Hermle, M.
name: Glunz, S.W.
Publisher: name: WIP
Year: 2013
Subjects: WAFER-BASED SILICON SOLAR CELLS AND MATERIALS TECHNOLOGY
Silicon Solar Cell Improvements

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 988-992
description: Due to the improvements in material quality and surface passivation, high-efficiency solar cells are
often limited by the recombination at the metal semiconductor contacts. As a solution to this problem, Swanson
proposed “to put a heterojunction with a band-gap larger than silicon between the metal and silicon”[1] also known
as passivated contact. In this work, a tunnel oxide passivated contact (TOPCon) structure allowing both an excellent
surface passivation and an effective carrier transport is presented. High-efficiency n-type solar cells featuring this
novel passivated rear contact instead of a point contact structure at the rear side yield a maximum efficiency of
23.7 %, a FF of 82.2 % and a Voc of 703 mV.
Eroi e santi come custodi esemplari: il tema iconografico dei portali delle celle del Tempio Malatestiano
Creators: name: Daniotti, Claudia
Publisher: name: La Rivista di Engramma
Year: 2008
Subjects: Malatesta
Temple
Portal

description: The essay delves into the analysis of the decorations of the Portal of the Chapel of the Relics in Malatesta Temple.
The limitations of model-based experimental design and parameter estimation in sloppy systems
Creators: name: White, Andrew
name: Tolman, Malachi
name: Thames, Howard D.
name: Withers, Hubert Rodney
name: Mason, Kathy A.
name: Transtrum, Mark K.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantitative Methods (q-bio.QM)
subject: FOS: Biological sciences

description: We explore the relationship among model fidelity, experimental design, and parameter estimation in sloppy models. We show that the approximate nature of mathematical models poses challenges for experimental design in sloppy models. In many models of complex biological processes it is unknown what are the relevant physics that must be included to explain collective behaviors. As a consequence, models are often overly complex, with many practically unidentifiable parameters. Furthermore, which details are relevant/irrelevant vary among potential experiments. By selecting complementary experiments, experimental design may inadvertently make details that were ommitted from the model become relevant. When this occurs, the model will fail to give a good fit to the data. We use a simple hyper-model of model error to quantify a model's inadequacy and apply it to two models of complex biological processes (EGFR signaling and DNA repair) with optimally selected experiments. We find that although parameters may be accurately estimated, the error in the model renders it less predictive than it was in the sloppy regime where model error is small. We introduce the concept of a \emph{sloppy system}--a sequence of models of increasing complexity that become sloppy in the limit of microscopic accuracy. We explore the limits of accurate parameter estimation in sloppy systems and argue that system identification better approached by considering a hierarchy of models of varying detail rather than focusing parameter estimation in a single model.
description: 27 pages, 8 figures
High-Efficiency Solar Cells from n-Type Cz Silicon
Creators: name: Schultz-Wittmann, O.
name: De Ceuster, D.
name: Turner, A.
name: Crafts, D.
name: Ong, R.
name: Suwito, D.
name: Eggleston, B.
name: Prajapati, V.
name: Kleiman, A.
name: Bhatt, K.
Publisher: name: WIP
Year: 2013
Subjects: WAFER-BASED SILICON SOLAR CELLS AND MATERIALS TECHNOLOGY
Silicon Solar Cell Improvements

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 1004-1007
description: Despite significant carrier lifetime advantages, phosphorus doped n-type silicon has not yet replaced boron doped ptype
silicon as the preferred base material for crystalline silicon solar cells. The main reasons are the technical
difficulty of obtaining well passivated boron doped emitters and a significant spread in the substrate resistivity due to
the small segregation coefficient of phosphorus. Hence, new technologies for surface passivation need to be
developed as well as designs tolerant of the large substrate resistivity spread. We have successfully developed a
manufacturing technology that overcomes these problems and in addition uses Cu plating for cost reduction. The
TetraCell technology is alignment-free, compatible with n-type as well as p-type crystalline silicon and can be used in
bifacial module designs. So far, 21% cell efficiency has been achieved on 125x125 mm and 156x156 mm wafers.
Cells were assembled into modules and accelerated reliability tests were conducted and passed extended IEC 61215
criteria.
Perturbation of error bounds
Creators: name: Kruger, A. Y.
name: López, M. A.
name: Théra, M. A.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 49J52, 49J53, 90C30

description: Our aim in the current article is to extend the developments in Kruger, Ngai & Théra, SIAM J. Optim. 20(6), 3280-3296 (2010) and, more precisely, to characterize, in the Banach space setting, the stability of the local and global error bound property of inequalities determined by proper lower semicontinuous under data perturbations. We propose new concepts of (arbitrary, convex and linear) perturbations of the given function defining the system under consideration, which turn out to be a useful tool in our analysis. The characterizations of error bounds for families of perturbations can be interpreted as estimates of the `radius of error bounds'. The definitions and characterizations are illustrated by examples.
description: 20 pages
Engineering the quantum states of light in a Kerr-nonlinear resonator by two-photon driving
Creators: name: Puri, Shruti
name: Boutin, Samuel
name: Blais, Alexandre
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Cat states of the microwave field stored in high-Q resonators show great promise for robust encoding and manipulation of quantum information. Here we propose an approach to efficiently prepare such cat states in a Kerr-nonlinear resonator by the use of a two-photon drive. We show that this preparation is robust against single-photon loss. We moreover find that it is possible to remove undesirable phase evolution induced by a Kerr nonlinearity using a two-photon drive of appropriate amplitude and phase. Finally, we present a universal set of quantum logical gates that can be performed on the engineered eigenspace of the two-photon driven Kerr-nonlinear resonator.
Single-Step Multiple-Layers Wafer Slicing from Macroporous Silicon
Creators: name: Garin, M.
name: Hernández, D.
name: Trifonov, T.
name: Cardador, D.
name: Alcubilla González, R.
Publisher: name: WIP
Year: 2013
Subjects: WAFER-BASED SILICON SOLAR CELLS AND MATERIALS TECHNOLOGY
Silicon Feedstock, Crystallisation and Wafering

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 933-936
description: There is a rising interest, from both photovoltaics and microelectronics industry, in wafer thickness
reduction. During the last decade, it has been steadily reduced from 350 μm to 180 μm, but benefits are foreseen
for thicknesses well below these values. The current sawing technology, however, suffers from large kerf losses
and further reductions are increasingly difficult. Several technologies have emerged aiming to produce thin Si
foils from a wafer, such as layer transfer, induced cleaving, or pore reorganization. These methods produce a
single layer by step. In this work we report on a method able to produce many crystalline layers from a single
silicon wafer and in a single fabrication step.
Neural-Network Decoders for Quantum Error Correction using Surface Codes:A Space Exploration of the Hardware Cost-Performance Trade-Offs
Creators: name: Overwater, Ramon
name: Babaie, Masoud
name: Sebastiano, Fabio
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum Error Correction (QEC) is required in quantum computers to mitigate the effect of errors on physical qubits. When adopting a QEC scheme based on surface codes, error decoding is the most computationally expensive task in the classical electronic back-end. Decoders employing neural networks (NN) are well-suited for this task but their hardware implementation has not been presented yet. This work presents a space exploration of fully-connected feed-forward NN decoders for small distance surface codes. The goal is to optimize the neural network for high decoding performance, while keeping a minimalistic hardware implementation. This is needed to meet the tight delay constraints of real-time surface code decoding. We demonstrate that hardware based NN-decoders can achieve high decoding performance comparable to other state-of-the-art decoding algorithms whilst being well below the tight delay requirements $(\approx 440\ \mathrm{ns})$ of current solid-state qubit technologies for both ASIC designs $(<30\ \mathrm{ns})$ and FPGA implementations $(<90\ \mathrm{ns})$. These results designates NN-decoders as fitting candidates for an integrated hardware implementation in future large-scale quantum computers.
description: 19 pages, 21 figures, 5 papers
Process Simplification for High Efficiency, Small Area Interdigitated Back Contact Silicon Solar Cells
Creators: name: O’Sullivan, B.
name: Debucquoy, M.
name: Singh, S.
name: Uruena, A.
name: Récaman Payo, M.
name: Posthuma, N.
name: Poortmans, J.
Publisher: name: WIP
Year: 2013
Subjects: WAFER-BASED SILICON SOLAR CELLS AND MATERIALS TECHNOLOGY
Silicon Solar Cell Improvements

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 956-960
description: A baseline process for small area (4 cm2) interdigitated back contact (IBC) silicon solar cells at imec is presented,
based on n-type 156x156 mm2 CZ silicon wafers. This process has been stabilised, and best obtained (calibrated)
conversion efficiencies of 23.1% (average 22.8%) have been achieved. Recent developments have focused on
process simplification, and are the subject of this report. The key findings include the benefits of introducing a
wet oxidation step as the boron activation/emitter-passivation step (higher sheet resistance, lower J0, and
consequently higher efficiency). The surface cleaning routines have also been revised, resulting in slight increases
in efficiency for simplified cleaning process (with consequent reduced process time/chemical consumption).
Finally, results on contact definition by laser ablation are presented, showing a strong impact of the contact grid
density on the BSF and emitter regions, on cell performance. The maximum achieved efficiency of 22.9% shows
the potential for lithography replacement with an industrially viable patterning technique. These steps are driven
by the goal of achieving a simplified and cost effective IBC process flow reaching high cell efficiencies.