Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
Full Text
Peer Reviewed
See detailCSR in an asymmetric duopoly with environmental externalities
Tampieri, Alessandro UL; Lambertini, Luca; Palestini, Arsen

in Southern Economic Journal (2016)

Detailed reference viewed: 79 (1 UL)
Full Text
See detailCSR in an Asymmetric Duopoly with Environmental Externalities
Tampieri, Alessandro UL; Lambertini, Luca; Palestini, Arsen

E-print/Working paper (2014)

Detailed reference viewed: 59 (4 UL)
Full Text
See detailCSV-Wahlprogramm ouni klore Profil
Högenauer, Anna-Lena UL

Article for general public (2019)

Detailed reference viewed: 59 (3 UL)
Full Text
Peer Reviewed
See detailCu(InGa)Se2 Solar Cells
Shafarman, William N.; Siebentritt, Susanne UL; Stolt, Lars

in Luque, Antonio; Hegedus, Steven (Eds.) Handbook of Photovoltaic Science and Engineering, 2nd Edition (2010)

Detailed reference viewed: 109 (1 UL)
Full Text
Peer Reviewed
See detailCu-rich CuInSe2 solar cells with a Cu-poor surface
Aida, Yasuhiro UL; Depredurand, Valérie UL; Larsen, Jes K. UL et al

in PROGRESS IN PHOTOVOLTAICS (2015), 23

Detailed reference viewed: 349 (44 UL)
Full Text
Peer Reviewed
See detailCu-Rich Precursors Improve Kesterite Solar Cells
Mousel, Marina; Schwarz, Torsten; Djemour, Rabie et al

in ADVANCED ENERGY MATERIALS (2014), 4(2),

Detailed reference viewed: 77 (0 UL)
Full Text
Peer Reviewed
See detailCu-rich precursors improve kesterite solar cells
Mousel, Marina UL; Schwarz, Torsten; Djemour, Rabie UL et al

in Advanced Energy Materials (2013), 4

Detailed reference viewed: 147 (9 UL)
Full Text
Peer Reviewed
See detailCu2SnS3 based thin film solar cells from chemical spray pyrolysis
Sayed, Mohamed H.; Robert, Erika UL; Dale, Phillip UL et al

in Thin Solid Films (2019), 669

Detailed reference viewed: 136 (3 UL)
Full Text
See detailCu2SnS3-based thin film solar cell from electrodeposition-annealing route
Robert, Erika UL; De Wild, Jessica UL; Dale, Phillip UL

in IEEE Proceedings (2015, June)

Cu2SnS3 is a new emerging material for thin film photovoltaics, composed of three abundant and non toxic elements. Its p-type conductivity, bandgap of 0.93 eV and absorption coefficient above 104 cm-1 ... [more ▼]

Cu2SnS3 is a new emerging material for thin film photovoltaics, composed of three abundant and non toxic elements. Its p-type conductivity, bandgap of 0.93 eV and absorption coefficient above 104 cm-1 make it a promising absorber layer for p-n heterojunction devices. In this study, the Cu2SnS3 absorber is synthesized from electroplated stacked Cu-Sn precursors further annealed in chalcogen atmosphere (S and SnS). The electroplating has been processed on upscaled 45 x 50 mm2 Mo-coated soda-lime glass substrates on which the metallic layers seem to delaminate easily from the substrate due to increased stress between them. To reduce this stress the precursors are subjected to pre-alloying treatments. The effects of pre-alloying are investigated in terms of final absorber morphology, composition and crystal structure. Precursors are annealed at 250°C and 350°C. The prealloying at 350°C is far above the melting point of Sn around 230°C and these samples show de-wetting. The as-deposited and 250°C pre-alloyed samples are processed further into absorber layers and solar cells. The finished absorber layers show mainly monoclinic Cu2SnS3. Absorbers completed into devices show a device power conversion efficiency of 0.64%. The spectral response suggests the existence of two bandgaps, consistent with previous results. [less ▲]

Detailed reference viewed: 162 (14 UL)
Full Text
Peer Reviewed
See detailCu2ZnSnSe4 device obtained by formate chemistry for metallic precursor layer fabrication
Tombolato, Sara; Berner, Ulrich Maximilian UL; Colombara, Diego UL et al

in Solar Energy (2015), 116

Detailed reference viewed: 132 (5 UL)
See detailCu2ZnSnSe4 polymorphs and secondary phases: characterization by Raman spectroscopy and photoluminescence
Djemour, M'hamed Rabie UL

Doctoral thesis (2014)

Cu2ZnSn(S,Se)4 (CZTS/Se)has the necessary properties to be suitable as a thin film solar cell absorber. The reported record e ciencies for pure CZTSe are measured on CZTSe absorbers of di erent band gaps ... [more ▼]

Cu2ZnSn(S,Se)4 (CZTS/Se)has the necessary properties to be suitable as a thin film solar cell absorber. The reported record e ciencies for pure CZTSe are measured on CZTSe absorbers of di erent band gaps (0.96 eV and 1 eV as extracted from photoluminescence (PL), for example) although they were supposed to be the same material. This di fference in band gaps is usually explained by a diff erent order of the composing elements leading to crystal structures from other space groups (polymorphs) which have di erent band gaps. Various polymorphs and secondary phases are possible. This implies the importance of possessing tools to discernate the phases that tend to form whilst CZTSe is grown. This is one main goal of this thesis. The main measurement techniques employed during this thesis are Photoluminescence (PL) and Raman spectroscopy. Both are optical, contact-less and non-destructive characterization techniques. Following on from the first chapter which provides relevant background information about the di fferent polymorphs, secondary phases and measurement techniques used, the second chapter introduces the setup and the sample preparation techniques. The third chapter reports the fi rst results of this thesis: the discrimination of secondary phases encountered during the growth of CZTSe solar cell absorbers by Raman and PL. Chapter four discusses the Raman spectrum of CZTSe, especially focusing on the asymmetry of the mode of highest intensity, looking at the origins of this broadening. Additionally, a polarization and orientation Raman study is presented assigning the modes to their symmetry, therefore allowing the di erentiation between crystals from various polymorphs. The next chapter examines the luminescences attributed to CZTSe. An intensity dependent PL study assigns the various luminescences encountered to a mixture of band gaps. In the fi nal chapter, the findings reported on in this thesis are briefly summarized and discussed in the context of the ongoing research on the subject matter. [less ▲]

Detailed reference viewed: 255 (16 UL)
Full Text
Peer Reviewed
See detailCu2ZnSnSe4 thin film solar cells produced by selenisation of magnetron sputtered precursors
Zoppi, Guillaume; Forbes, Ian; Miles, Robert W. et al

in Progress in Photovoltaics (2009), 17(5), 315-319

Detailed reference viewed: 82 (0 UL)
Full Text
Peer Reviewed
See detailCu2ZnSnSe4 thin film solar cells produced via co-evaporation and annealing including a SnSe2 capping layer
Redinger, Alex UL; Mousel, Marina; Djemour, Rabie et al

in PROGRESS IN PHOTOVOLTAICS (2014), 22(1), 51-57

Cu2ZnSnSe4 (CZTSe) thin film solar cells have been produced via co-evaporation followed by a high-temperature annealing. In order to reduce the decomposition of the CZTSe, a SnSe2 capping layer has been ... [more ▼]

Cu2ZnSnSe4 (CZTSe) thin film solar cells have been produced via co-evaporation followed by a high-temperature annealing. In order to reduce the decomposition of the CZTSe, a SnSe2 capping layer has been evaporated onto the absorber prior to the high-temperature treatment. This eliminates the Sn losses due to SnSe evaporation. A solar cell efficiency of 5.1 could be achieved with this method. Moreover, the device does not suffer from high series resistance, and the dominant recombination pathway is situated in the absorber bulk. Finally different illumination conditions (white light, red light, and yellow light) reveal a strong loss in fill factor if no carriers are generated in the CdS buffer layer. This effect, known as red-kink effect, has also been observed in the closely related Cu(In,Ga)Se-2 thin film solar cells. Copyright (c) 2013 John Wiley Sons, Ltd. [less ▲]

Detailed reference viewed: 72 (0 UL)
Full Text
See detailCUBA: Artificial conviviality and user-behaviour analysis in web-feeds
Kaufmann, Sascha UL

Doctoral thesis (2010)

Conviviality is a concept of great depth that plays an important role in any social interaction. A convivial relation between individuals is one that allows the participating individuals to behave and ... [more ▼]

Conviviality is a concept of great depth that plays an important role in any social interaction. A convivial relation between individuals is one that allows the participating individuals to behave and interact with each other following a set of conventions that are shared, commonly agreed upon, or at least understood. This presupposes an implicit or an explicit regulation mechanism based on consensus or social contracts and applies to the behaviours and interactions of participating individuals. With respect to an intelligent web-based system, an applicable social contribution is the give of assistance to other users in situations that are unclear and in guiding him to find the right decision whenever a conflict arises. Such a convivial social biotope deeply depends on both implicit and explicit co-operation and collaboration of natural users inside a community. Here, the individual conviviality may benefit from “The Wisdom of Crowds”, which fosters a dynamic understanding of the user’s behaviour and a strong influence of an individual’s well being to another person(s). The web-based system CUBA focus on such a behavioural analysis through profiling and demonstrates a convivial stay within a web-based feed system. [less ▲]

Detailed reference viewed: 176 (92 UL)
Full Text
Peer Reviewed
See detailCubic Sieve Congruence of the Discrete Logarithm Problem, and fractional part sequences
Venkatesh, Srinivas Vivek UL; C. E. Veni Madhavan

in Journal of Symbolic Computation (2014), 64

The Cubic Sieve Method for solving the Discrete Logarithm Problem in prime fields requires a nontrivial solution to the Cubic Sieve Congruence (CSC) $ x^3 \equiv y^2 z (mod p) $, where 'p' is a given ... [more ▼]

The Cubic Sieve Method for solving the Discrete Logarithm Problem in prime fields requires a nontrivial solution to the Cubic Sieve Congruence (CSC) $ x^3 \equiv y^2 z (mod p) $, where 'p' is a given prime number. A nontrivial solution must also satisfy $ x^3 \neq y^2 z $ and $ 1 <= x,y,z < p^a $, where 'a' is a given real number such that $ 1/3 < a <= 1/2 $. The CSC problem is to find an efficient algorithm to obtain a nontrivial solution to CSC. CSC can be parametrized as $ x \equiv v^2 z (mod p) $ and $ y \equiv v^3 z (mod p) $. In this paper, we give a deterministic polynomial-time ($ O(ln^3 p) $ bit-operations) algorithm to determine, for a given 'v', a nontrivial solution to CSC, if one exists. Previously it took $ õ(p^a) $ time in the worst case to determine this. We relate the CSC problem to the gap problem of fractional part sequences, where we need to determine the non-negative integers 'N' satisfying the fractional part inequality $ {\theta N} < \phi $ ($ \theta $ and $ \phi $ are given real numbers). The correspondence between the CSC problem and the gap problem is that determining the parameter 'z' in the former problem corresponds to determining 'N' in the latter problem. We also show in the $ a = 1/2 $ case of CSC that for a certain class of primes the CSC problem can be solved deterministically in $ õ(p^{1/3}) $ time compared to the previous best of $ õ(p^{1/2}) $. It is empirically observed that about one out of three primes is covered by the above class. [less ▲]

Detailed reference viewed: 100 (2 UL)
Full Text
Peer Reviewed
See detailCue reactivity in male restrained eaters: the role of negative cognitions as predictors of food intake
Hilbert, Anja; Vögele, Claus UL; Himmelmann, Uta

in Eating and Weight Disorders [=EWD] (2007), 12

OBJECTIVE: While restrained eating is one of the most well-established risk factors of eating disorders in females, its role for eating disturbances in males remains largely unclear. The present study ... [more ▼]

OBJECTIVE: While restrained eating is one of the most well-established risk factors of eating disorders in females, its role for eating disturbances in males remains largely unclear. The present study investigates eating behaviour in response to food cues and negative cognitions in male restrained eaters. METHODS: Twenty-four restrained eaters and 21 unrestrained eaters volunteered in a cue reactivity experiment consisting of two exposure trials with and without response prevention. Food and macronutrient intake were monitored, and negative cognitions were assessed using a self-report cognition inventory. RESULTS: Male restrained eaters consumed a larger amount of food, specifically carbohydrates, than unrestrained eaters. This greater food intake was predicted by negative cognitions about self-esteem and occurred in restrained eaters who had reported binge eating episodes in the diagnostic interview. DISCUSSION: Results suggest marked cue reactivity in male restrained eaters with an increased risk of overeating in those who experience low situational self-esteem and who are binge eaters. [less ▲]

Detailed reference viewed: 75 (0 UL)
Full Text
Peer Reviewed
See detailCuInSe2 Precursor Films Electro-Deposited Directly onto MoSe2
Cummings, Charles Y.; Zoppi, Guillaume; Forbes, Ian et al

in Journal of Electroanalytical Chemistry (2010), 645(1), 16-21

Detailed reference viewed: 62 (0 UL)
Full Text
Peer Reviewed
See detailCuInSe2 semiconductor formation by laser annealing
Meadows, Helen UL; Regesch, David UL; Thevenin, Maxime UL et al

in Thin Solid Films (2014)

Detailed reference viewed: 85 (1 UL)