54313
2017
2017
eng
9
1
2
article
Wiley-VCH
Weinheim
1
--
2017-12-06
--
Efficient large area organic solar cells processed by blade-coating with single-component green solvent
While the performance of laboratory-scale organic solar cells (OSCs) continues to grow, development of high efficiency large area OSCs remains a big challenge. Although a few attempts to produce large area organic solar cells (OSCs) have been reported, there are still challenges on the way to realizing efficient module devices, such as the low compatibility of the thickness-sensitive active layer with large area coating techniques, the frequent need for toxic solvents and tedious optimization processes used during device fabrication. In this work, highly efficient thickness-insensitive OSCs based on PTB7-Th:PC71BM that processed with single-component green solvent 2-methylanisole are presented, in which both junction thickness limitation and solvent toxicity issues are simultaneously addressed. Careful investigation reveals that this green solvent prevents the evolution of PC71BM into large area clusters resulting in reduced charge carrier recombination, and largely eliminates trapping centers, and thus improves the thickness tolerance of the films. These findings enable us to address the scalability and solvent toxicity issues and to fabricate a 16 cm(2) OSC with doctor-blade coating with a state-of-the-art power conversion efficiency of 7.5% using green solvent.
Solar Rrl
10.1002/solr.201700169
2367-198X
wos:2018
UNSP 1700169
WOS:000429443500005
Huang, F (reprint author), South China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Guangdong, Peoples R China.; Shoaee, S (reprint author), Univ Potsdam, Inst Phys & Astron, Optoelect Organ Semicond, D-14476 Potsdam, Germany., shoai@uni-potsdam.de; msfhuang@scut.edu.cn
Ministry of Science and Technology [2014CB643501]; Natural Science Foundation of ChinaNational Natural Science Foundation of China [21634004, 21520102006, 91633301]; foundation of Guangzhou Science and Technology Project [201607020010, 201707020019]; China Postdoctoral Science FoundationChina Postdoctoral Science Foundation [2016M590773, 2017T100626]; Alexander von Humboldt FoundationAlexander von Humboldt Foundation
2022-03-14T12:53:19+00:00
sword
importub
filename=package.tar
7465487039eeb70c55e2c412be270526
false
true
Kai Zhang
Zhiming Chen
Ardalan Armin
Sheng Dong
Ruoxi Xia
Hin-Lap Yip
Safa Shoaee
Fei Huang
Yong Cao
eng
uncontrolled
doctor-blade coating
eng
uncontrolled
green solvents
eng
uncontrolled
large area devices
eng
uncontrolled
organic solar cells
eng
uncontrolled
thickness insensitive active layers
Physik
Institut für Physik und Astronomie
Referiert
Import
40216
2017
2017
eng
7
article
Macmillan Publishers Limited
London
1
--
2017-07-05
--
Chimeras and complex cluster states in arrays of spin-torque oscillators
We consider synchronization properties of arrays of spin-torque nano-oscillators coupled via an RC load. We show that while the fully synchronized state of identical oscillators may be locally stable in some parameter range, this synchrony is not globally attracting. Instead, regimes of different levels of compositional complexity are observed. These include chimera states (a part of the array forms a cluster while other units are desynchronized), clustered chimeras (several clusters plus desynchronized oscillators), cluster state (all oscillators form several clusters), and partial synchronization (no clusters but a nonvanishing mean field). Dynamically, these states are also complex, demonstrating irregular and close to quasiperiodic modulation. Remarkably, when heterogeneity of spin-torque oscillators is taken into account, dynamical complexity even increases: close to the onset of a macroscopic mean field, the dynamics of this field is rather irregular.
Scientific reports
10.1038/s41598-017-04918-9
28680160
2045-2322
Universität Potsdam, Publikationsfonds
PA 2017_32
1552.95
online registration
4648
WOS:000404846000021
<a href="http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-402180">Zweitveröffentlichung in der Schriftenreihe Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe ; 384</a>
CC-BY - Namensnennung 4.0 International
Michael A. Zaks
Arkadij Pikovskij
Informatik, Informationswissenschaft, allgemeine Werke
Physik
Institut für Physik und Astronomie
Referiert
Publikationsfonds der Universität Potsdam
Open Access
Universität Potsdam
55272
2017
2017
eng
3767
3774
8
3
465
article
Oxford Univ. Press
Oxford
1
2016-11-23
2016-11-23
--
Attenuation of TeV gamma-rays by the starlight photon field of the host galaxy
The absorption of TeV gamma-ray photons produced in relativistic jets by surrounding soft photon fields is a long-standing problem of jet physics. In some cases, the most likely emission site close to the central black hole is ruled out because of the high opacity caused by strong optical and infrared photon sources, such as the broad-line region. Mostly neglected for jet modelling is the absorption of gamma-rays in the starlight photon field of the host galaxy. Analysing the absorption for arbitrary locations and observation angles of the gamma-ray emission site within the host galaxy, we find that the distance to the galaxy centre, the observation angle, and the distribution of starlight in the galaxy are crucial for the amount of absorption. We derive the absorption value for a sample of 20 TeV-detected blazars with a redshift z(r) < 0.2. The absorption value of the gamma-ray emission located in the galaxy centre may be as high as 20 per cent, with an average value of 6 per cent. This is important in order to determine the intrinsic blazar parameters. We see no significant trends in our sample between the degree of absorption and host properties, such as starlight emissivity, galactic size, half-light radius, and redshift. While the uncertainty of the spectral properties of the extragalactic background light exceeds the effect of absorption by stellar light from the host galaxy in distant objects, the latter is a dominant effect in nearby sources. It may also be revealed in a differential comparison of sources with similar redshifts.
Monthly notices of the Royal Astronomical Society
10.1093/mnras/stw3032
0035-8711
1365-2966
wos:2017
WOS:000395165900085
Zacharias, M (reprint author), Heidelberg Univ, Landessternwarte, D-69117 Heidelberg, Germany.; Zacharias, M (reprint author), North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa., mzacharias.phys@gmail.com
2022-06-22T07:34:24+00:00
sword
importub
filename=package.tar
d752e7eb237669a58da75ee134d3833e
Zacharias, Michael
false
true
Michael Zacharias
Xuhui Chen
Stefan Wagner
eng
uncontrolled
opacity
eng
uncontrolled
radiation mechanisms: non-thermal
eng
uncontrolled
galaxies: active
eng
uncontrolled
gamma-rays: galaxies
Astronomie und zugeordnete Wissenschaften
Physik
Institut für Physik und Astronomie
Referiert
Import
55202
2017
2017
eng
8
7
article
Nature Publ. Group
London
1
2017-03-09
2017-03-09
--
The Role of Super-Atom Molecular Orbitals in Doped Fullerenes in a Femtosecond Intense Laser Field
The interaction of gas phase endohedral fullerene Ho3N@C-80 with intense (0.1-5 x 10(14) W/cm(2)), short (30 fs), 800 nm laser pulses was investigated. The power law dependence of Ho3N@C-80(q+), q = 1-2, was found to be different from that of C-60. Time-dependent density functional theory computations revealed different light-induced ionization mechanisms. Unlike in C-60, in doped fullerenes, the breaking of the cage spherical symmetry makes super atomic molecular orbital (SAMO) states optically active. Theoretical calculations suggest that the fast ionization of the SAMO states in Ho3N@C-80 is responsible for the n = 3 power law for singly charged parent molecules at intensities lower than 1.2 x 10(14) W/cm(2).
Scientific reports
10.1038/s41598-017-00124-9
28273922
2045-2322
wos:2017
121
WOS:000396868900003
Berrah, N (reprint author), Univ Connecticut, Dept Phys, Storrs, CT 06269 USA., nora.berrah@uconn.edu
"Fonds der Chemischen Industrie
2022-06-16T14:18:21+00:00
sword
importub
filename=package.tar
ca181abd15725b7dd756f6ddd548e133
Berrah, Nora
false
true
CC-BY - Namensnennung 4.0 International
Hui Xiong
Benoit Mignolet
Li Fang
Timur Osipov
Thomas J. A. Wolf
Emily Sistrunk
Markus Gühr
Francoise Remacle
Nora Berrah
Physik
Institut für Physik und Astronomie
Referiert
Import
40268
2017
2017
eng
7
7
article
MDPI
Basel
1
--
2017-07-01
--
Observing Femtosecond Fragmentation Using Ultrafast X-ray-Induced Auger Spectra
Molecules often fragment after photoionization in the gas phase. Usually, this process can only be investigated spectroscopically as long as there exists electron correlation between the photofragments. Important parameters, like their kinetic energy after separation, cannot be investigated. We are reporting on a femtosecond time-resolved Auger electron spectroscopy study concerning the photofragmentation dynamics of thymine. We observe the appearance of clearly distinguishable signatures from thymine′s neutral photofragment isocyanic acid. Furthermore, we observe a time-dependent shift of its spectrum, which we can attribute to the influence of the charged fragment on the Auger electron. This allows us to map our time-dependent dataset onto the fragmentation coordinate. The time dependence of the shift supports efficient transformation of the excess energy gained from photoionization into kinetic energy of the fragments. Our method is broadly applicable to the investigation of photofragmentation processes.
Applied Sciences
10.3390/app7070681
2076-3417
Universität Potsdam, Publikationsfonds
PA 2017_38
518.76
online registration
WOS:000407700400038
<a href="http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-402692">Zweitveröffentlichung in der Schriftenreihe Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe ; 386</a>
CC-BY - Namensnennung 4.0 International
Thomas J. A. Wolf
Fabian Holzmeier
Isabella Wagner
Nora Berrah
Christoph Bostedt
John Bozek
Philip H. Bucksbaum
Ryan Coffee
James Cryan
Joe Farrell
Raimund Feifel
Todd J. Martinez
Brian McFarland
Melanie Mucke
Saikat Nandi
Francesco Tarantelli
Ingo Fischer
Markus Gühr
eng
uncontrolled
ultrafast dynamics
eng
uncontrolled
Auger electron spectroscopy
eng
uncontrolled
photofragmentation
eng
uncontrolled
photochemistry
Physik
Institut für Physik und Astronomie
Referiert
Publikationsfonds der Universität Potsdam
Open Access
Universität Potsdam
55354
2017
2017
eng
15
2
835
article
IOP Publ. Ltd.
Bristol
1
2017-02-01
2017-02-01
--
Nonlinear Particle Acceleration and Thermal Particles in GRB Afterglows
The standard model for GRB afterglow emission treats the accelerated electron population as a simple power law, N(E) proportional to E-p for p greater than or similar to 2. However, in standard Fermi shock acceleration, a substantial fraction of the swept-up particles do not enter the acceleration process at all. Additionally, if acceleration is efficient, then the nonlinear back-reaction of accelerated particles on the shock structure modifies the shape of the nonthermal tail of the particle spectra. Both of these modifications to the standard synchrotron afterglow impact the luminosity, spectra, and temporal variation of the afterglow. To examine the effects of including thermal particles and nonlinear particle acceleration on afterglow emission, we follow a hydrodynamical model for an afterglow jet and simulate acceleration at numerous points during the evolution. When thermal particles are included, we find that the electron population is at no time well fitted by a single power law, though the highest-energy electrons are; if the acceleration is efficient, then the power-law region is even smaller. Our model predicts hard-soft-hard spectral evolution at X-ray energies, as well as an uncoupled X-ray and optical light curve. Additionally, we show that including emission from thermal particles has drastic effects (increases by factors of 100 and 30, respectively) on the observed flux at optical and GeV energies. This enhancement of GeV emission makes afterglow detections by future gamma-ray observatories, such as CTA, very likely.
The astrophysical journal : an international review of spectroscopy and astronomical physics
10.3847/1538-4357/aa56c3
0004-637X
1538-4357
wos:2017
248
WOS:000401154800040
Warren, DC (reprint author), RIKEN, Astrophys Big Bang Lab, Saitama 3510198, Japan., donald.warren@riken.jp
2022-06-27T12:26:05+00:00
sword
importub
filename=package.tar
1401b65fb2c1cdd15985dd36c740f0e0
false
true
Donald C. Warren
Donald C. Ellison
Maxim V. Barkov
Shigehiro Nagataki
eng
uncontrolled
acceleration of particles
eng
uncontrolled
cosmic rays
eng
uncontrolled
gamma-ray burst: general
eng
uncontrolled
shock waves
eng
uncontrolled
turbulence
Physik
Institut für Physik und Astronomie
Referiert
Import
53812
2017
2017
eng
10
2
144
article
American Society of Civil Engineers
Reston
1
2017-11-22
2017-11-22
--
Reduced-Parameter Method for Maximum Entropy Analysis of Hydraulic Pipe Flow Networks
A maximum entropy (MaxEnt) method is developed to predict flow rates or pressure gradients in hydraulic pipe networks without sufficient information to give a closed-form (deterministic) solution. This methodology substantially extends existing deterministic flow network analysis methods. It builds on the MaxEnt framework previously developed by the authors. This study uses a continuous relative entropy defined on a reduced parameter set, here based on the external flow rates. This formulation ensures consistency between different representations of the same network. The relative entropy is maximized subject to observable constraints on the mean values of a subset of flow rates or potential differences, the frictional properties of each pipe, and physical constraints arising from Kirchhoff’s first and second laws. The new method is demonstrated by application to a simple one-loop network and a 1,123-node, 1,140-pipe water distribution network in the suburb of Torrens, Australian Capital Territory, Australia.
Journal of hydraulic engineering
10.1061/(ASCE)HY.1943-7900.0001379
0733-9429
1943-7900
wos:2018
04017060
WOS:000418189700002
Niven, RK (reprint author), Univ New South Wales Canberra, Sch Engn & Informat Technol, Canberra, ACT 2600, Australia., r.niven@adfa.edu.au
Australian Research CouncilAustralian Research Council [DP140104402]; Go8/DAAD Australia-Germany Joint Research Cooperation Scheme [RG123832]; French Agence Nationale de la Recherche Chair of Excellence (TUCOROM)French National Research Agency (ANR); Institute Pprime, Poitiers, France
2022-02-08T09:55:14+00:00
sword
importub
filename=package.tar
9f573b20cc01d880985c1793925abc3e
Niven, Robert K.
S. H. Waldrip
Robert K. Niven
Markus Abel
M. Schlegel
eng
uncontrolled
Maximum entropy method
eng
uncontrolled
Water distribution systems
eng
uncontrolled
Hydraulic networks
eng
uncontrolled
Pipe networks
eng
uncontrolled
Hydraulic models
eng
uncontrolled
Nonlinear analysis
eng
uncontrolled
Probability
Astronomie und zugeordnete Wissenschaften
Physik
Institut für Physik und Astronomie
Referiert
Import
55442
2017
2017
eng
1699
1704
6
4
139
article
American Chemical Society
Washington
1
2017-01-24
2017-02-01
--
Absorption Tails of Donor
In disordered organic semiconductors, the transfer of a rather localized charge carrier from one site to another triggers a deformation of the molecular structure quantified by the intramolecular relaxation energy. A similar structural relaxation occurs upon population of intermolecular charge-transfer (CT) states formed at organic electron donor (D)-acceptor (A) interfaces. Weak CT absorption bands for D A complexes occur at photon energies below the optical gaps of both the donors and the C-60 acceptor as a result of optical transitions from the neutral ground state to the ionic CT state. In this work, we show that temperature-activated intramolecular vibrations of the ground state play a major role in determining the line shape of such CT absorption bands. This allows us to extract values for the relaxation energy related to the geometry change from neutral to ionic CT complexes. Experimental values for the relaxation energies of 20 D:C-60 CT complexes correlate with values calculated within density functional theory. These results provide an experimental method for determining the polaron relaxation energy in solid-state organic D-A blends and show the importance of a reduced relaxation energy, which we introduce to characterize thermally activated CT processes.
Journal of the American Chemical Society
C-60 Blends Provide Insight into Thermally Activated Charge-Transfer Processes and Polaron Relaxation
10.1021/jacs.6b12857
28068763
0002-7863
wos:2017
WOS:000393355600055
Vandewal, K (reprint author), Tech Univ Dresden, Dresden Integrated Ctr Appl Phys & Photon Mat IAP, D-01062 Dresden, Germany.; Vandewal, K (reprint author), Tech Univ Dresden, Inst Appl Phys, D-01062 Dresden, Germany.; Ortmann, F (reprint author), Tech Univ Dresden, Inst Mat Sci, Max Bergmann Ctr Biomat, D-01062 Dresden, Germany.; Ortmann, F (reprint author), Tech Univ Dresden, Dresden Ctr Computat Mat Sci, D-01062 Dresden, Germany.; Ortmann, F (reprint author), Tech Univ Dresden, Ctr Adv Elect Dresden Cfaed, D-01062 Dresden, Germany., koen.vandewal@iapp.de; frank.ortmann@tu-dresden.de
2022-07-01T11:34:35+00:00
sword
importub
filename=package.tar
d7fd63417017f9c38637fc66e5266a85
false
true
Koen Vandewal
Johannes Benduhn
Karl Sebastian Schellhammer
Tim Vangerven
Janna E. Rückert
Fortunato Piersimoni
Reinhard Scholz
Olaf Zeika
Yeli Fan
Stephen Barlow
Dieter Neher
Seth R. Marder
Jean Manca
Donato Spoltore
Gianaurelio Cuniberti
Frank Ortmann
Physik
Institut für Physik und Astronomie
Referiert
Import
53228
2017
2017
eng
342
351
10
57
article
Elsevier
Amsterdam
1
2017-10-13
2017-10-13
--
Reconstruction of coupling architecture of neural field networks from vector time series
We propose a method of reconstruction of the network coupling matrix for a basic voltage-model of the neural field dynamics. Assuming that the multivariate time series of observations from all nodes are available, we describe a technique to find coupling constants which is unbiased in the limit of long observations. Furthermore, the method is generalized for reconstruction of networks with time-delayed coupling, including the reconstruction of unknown time delays. The approach is compared with other recently proposed techniques.
Communications in nonlinear science & numerical simulation
10.1016/j.cnsns.2017.10.006
1007-5704
1878-7274
wos:2018
WOS:000415834200027
Sysoev, IV (reprint author), Saratov NG Chernyshevskii State Univ, 83 Astrakhanskaya Str, Saratov 410012, Russia., ivssci@gmail.com; ponomarenkovi@gmail.com; pikovsky@uni-potsdam.de
Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [16-02-00091]; Russian FederationRussian Federation [CPi-1510.2015.4]; Russian Science FoundationRussian Science Foundation (RSF) [17-12-01534]
2021-12-21T07:19:21+00:00
sword
importub
filename=package.tar
308bf3524bdc812acbfde6599d8056f1
Sysoev, Ilya V.
false
true
Ilya V. Sysoev
Vladimir I. Ponomarenko
Arkadij Pikovskij
eng
uncontrolled
Network reconstruction
eng
uncontrolled
Time series
eng
uncontrolled
Neurooscillators
eng
uncontrolled
Time delay
Physik
Institut für Physik und Astronomie
Referiert
Import
55377
2017
2017
eng
10
2
835
article
Institute of Physics Publ.
Bristol
1
2017-01-27
2017-01-27
--
The VMC Survey. XXII. Hierarchical star formation in the 30 Doradus-N158-N159-N160 star-forming complex
We study the hierarchical stellar structures in a similar to 1.5 deg(2) area covering the 30. Doradus-N158-N159-N160 starforming complex with the VISTA Survey of. Magellanic Clouds. Based on the young upper main-sequence stars, we find that the surface densities cover a wide range of values, from log(Sigma.pc(2))less than or similar to -2.0 to log(Sigma. pc(2)) greater than or similar to 0.0. Their distributions are highly non-uniform, showing groups that frequently have subgroups inside. The sizes of the stellar groups do not exhibit characteristic values, and range continuously from several parsecs to more than 100. pc; the cumulative size distribution can be well described by a single power law, with the power-law index indicating a projected fractal dimension D-2 = 1.6 +/- 0.3. We suggest that the phenomena revealed here support a scenario of hierarchical star formation. Comparisons with other star-forming regions and galaxies are also discussed.
The astrophysical journal : an international review of spectroscopy and astronomical physics
10.3847/1538-4357/835/2/171
0004-637X
1538-4357
wos:2017
171
WOS:000395085000010
Sun, NC (reprint author), Peking Univ, Kavli Inst Astron & Astrophys, Yi He Yuan Lu 5, Beijing 100871, Peoples R China.; Sun, NC (reprint author), Peking Univ, Dept Astron, Yi He Yuan Lu 5, Beijing 100871, Peoples R China., sunnc@foxmail.com; grijs@pku.edu.cn
2022-06-28T15:08:36+00:00
sword
importub
filename=package.tar
5af3f1eee7868f18210c555615b2784c
Sun, Ning-Chen
de Grijs, Richard
false
true
Ning-Chen Sun
Richard de Grijs
Smitha Subramanian
Maria-Rosa L. Cioni
Stefano Rubele
Kenji Bekki
Valentin D. Ivanov
Andrés E. Piatti
Vincenzo Ripepi
eng
uncontrolled
galaxies: clusters: general
eng
uncontrolled
infrared: stars
eng
uncontrolled
Magellanic Clouds
eng
uncontrolled
stars: formation
Physik
Institut für Physik und Astronomie
Referiert
Import