LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Back to previous search Search history
Advanced search

Your last searches

  1. AU="Bruening, Karsten"
  2. AU="Toale, P A" AU="Toale, P A"
  3. AU="Wouters van Poppel, Pleun C M"

Search results

Result 1 - 10 of total 18

Search options

  1. Article: Antisolvent processing of lead halide perovskite thin films studied by in situ X-ray diffraction

    Bruening, Karsten / Christopher J. Tassone

    Journal of materials chemistry. 2018 Oct. 9, v. 6, no. 39

    2018  

    Abstract: The conversion mechanism from the precursor ink to the perovskite film using antisolvent-induced crystallization has been studied using in situ X-ray diffraction during blade coating and antisolvent deposition. We study various solvent systems forming ... ...

    Abstract The conversion mechanism from the precursor ink to the perovskite film using antisolvent-induced crystallization has been studied using in situ X-ray diffraction during blade coating and antisolvent deposition. We study various solvent systems forming methylammonium lead iodide perovskite. We find that it is critical to add the antisolvent before the formation of a crystalline intermediate phase. Compared to thermal crystallization, the antisolvent-induced crystallization alters the conversion route. Instead of heterogeneous nucleation and conversion through a crystalline intermediate phase, antisolvent-assisted annealing leads to a rapid direct crystallization, resulting in highly regular smooth films.
    Keywords X-ray diffraction ; annealing ; coatings ; crystallization ; lead ; solvents
    Language English
    Dates of publication 2018-1009
    Size p. 18865-18870.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ZDB-ID 2702232-8
    ISSN 2050-7496 ; 2050-7488
    ISSN (online) 2050-7496
    ISSN 2050-7488
    DOI 10.1039/c8ta06025h
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  2. Book ; Thesis: In-situ structure characterization of elastomers during deformation and fracture

    Brüning, Karsten

    (Springer Theses)

    2014  

    Author's details Karsten Brüning
    Series title Springer Theses
    Language English
    Size XIV, 124 S., Ill., graph. Darst.
    Publisher Springer
    Publishing place Cham u.a.
    Document type Book ; Thesis
    Thesis / German Habilitation thesis Techn. Univ., Diss.--Dresden, 2013
    ISBN 9783319069067 ; 3319069063
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  3. Article: Crystallization kinetics of rapid spray plasma processed multiple cation perovskites in open air

    Hovish, Michael Q / Brüning, Karsten / Dauskardt, Reinhold H / Hilt, Florian / Rolston, Nicholas / Tassone, Christopher

    Journal of materials chemistry A. 2019 Dec. 17, v. 8, no. 1

    2019  

    Abstract: Rapid Spray Plasma Processing (RSPP) is a high throughput, scalable, and open-air route toward manufacturing perovskite solar modules. The plasma exposure is dosed such that the perovskite precursor solution is cured in milliseconds using a combination ... ...

    Abstract Rapid Spray Plasma Processing (RSPP) is a high throughput, scalable, and open-air route toward manufacturing perovskite solar modules. The plasma exposure is dosed such that the perovskite precursor solution is cured in milliseconds using a combination of rapid heating, reactive species, and UV photons. We implemented in situ wide angle X-ray scattering (WAXS) to characterize the crystal growth in multiple cation, mixed halide perovskite thin films—Csx(MAzFA1−z)1−xPb(Br0.17I0.83)3 for 0.05 ≤ x ≤ 0.25—fabricated in open air. The use of synchrotron radiation and high detector speeds resolved the formation and dissolution of a transient intermediate crystalline phase during the tens of milliseconds when the perovskite crystallized. Increasing the mole fraction of cesium and methylammonium resulted in a decrease in the intermediate phase and an increase in the average grain diameter. Increasing the cesium fraction suppressed phase segregation, as observed in photoluminescence. Calculations showed the refractive index decreased and the extinction coefficient increased with cesium fraction. Based on the rapid crystallization kinetics, RSPP perovskite films exhibit residual stress values >5× lower than spin coated films. Understanding the kinetics of perovskite formation enables the design of perovskite films with improved thermomechanical and operational stability.
    Keywords air ; cations ; cesium ; crystallization ; heat ; photoluminescence ; photons ; refractive index ; wide-angle X-ray scattering
    Language English
    Dates of publication 2019-1217
    Size p. 169-176.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ZDB-ID 2702232-8
    ISSN 2050-7496 ; 2050-7488
    ISSN (online) 2050-7496
    ISSN 2050-7488
    DOI 10.1039/c9ta07980g
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  4. Article ; Online: Unraveling the Unconventional Order of a High-Mobility Indacenodithiophene-Benzothiadiazole Copolymer.

    Cendra, Camila / Balhorn, Luke / Zhang, Weimin / O'Hara, Kathryn / Bruening, Karsten / Tassone, Christopher J / Steinrück, Hans-Georg / Liang, Mengning / Toney, Michael F / McCulloch, Iain / Chabinyc, Michael L / Salleo, Alberto / Takacs, Christopher J

    ACS macro letters

    2021  Volume 10, Issue 10, Page(s) 1306–1314

    Abstract: A new class of donor-acceptor (D-A) copolymers found to produce high charge carrier mobilities competitive with amorphous silicon (>1 ... ...

    Abstract A new class of donor-acceptor (D-A) copolymers found to produce high charge carrier mobilities competitive with amorphous silicon (>1 cm
    MeSH term(s) Polymers/chemistry ; Thiadiazoles
    Chemical Substances Polymers ; Thiadiazoles ; benzo-1,2,3-thiadiazole (273-77-8)
    Language English
    Publishing date 2021-10-05
    Publishing country United States
    Document type Journal Article ; Research Support, U.S. Gov't, Non-P.H.S. ; Research Support, Non-U.S. Gov't
    ISSN 2161-1653
    ISSN (online) 2161-1653
    DOI 10.1021/acsmacrolett.1c00547
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  5. Article: Improved stability and efficiency of perovskite solar cells with submicron flexible barrier films deposited in air

    Rolston, Nicholas / Printz, Adam D / Hilt, Florian / Hovish, Michael Q / Brüning, Karsten / Tassone, Christopher J / Dauskardt, Reinhold H

    Journal of materials chemistry A. 2017 Nov. 14, v. 5, no. 44

    2017  

    Abstract: We report on submicron organosilicate barrier films produced rapidly in air by a scalable spray plasma process that improves both the stability and efficiency of perovskite solar cells. The plasma is at sufficiently low temperature to prevent damage to ... ...

    Abstract We report on submicron organosilicate barrier films produced rapidly in air by a scalable spray plasma process that improves both the stability and efficiency of perovskite solar cells. The plasma is at sufficiently low temperature to prevent damage to the underlying layers. Oxidizing species and heat from the plasma improve device performance by enhancing both interfacial contact and the conductivity of the hole transporting layer. The thickness of the barrier films is tunable and transparent over the entire visible spectrum. The morphology and density of the barrier are shown to improve with the addition of a fluorine-based precursor. Devices with submicron coatings exhibited significant improvements in stability, maintaining 92% of their initial power conversion efficiencies after more than 3000 h in dry heat (85 °C, 25% RH) while also being resistant to degradation under simulated operational conditions of continuous exposure to light, heat, and moisture. X-ray diffraction measurements performed while heating showed the barrier film dramatically slows the formation of PbI2. The barrier films also are compatible with flexible devices, exhibiting no signs of cracking or delamination after 10 000 bending cycles on a 127 μm substrate with a bending radius of 1 cm.
    Keywords X-ray diffraction ; air ; coatings ; cracking ; delamination ; heat ; solar cells ; temperature
    Language English
    Dates of publication 2017-1114
    Size p. 22975-22983.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ZDB-ID 2702232-8
    ISSN 2050-7496 ; 2050-7488
    ISSN (online) 2050-7496
    ISSN 2050-7488
    DOI 10.1039/c7ta09178h
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  6. Article: Degradation mechanisms in mixed-cation and mixed-halide CsₓFA₁₋ₓPb(BryI₁₋y)₃ perovskite films under ambient conditions

    Marchezi, Paulo Ernesto / Therézio, Eralci Moreira / Szostak, Rodrigo / Loureiro, Hugo Campos / Bruening, Karsten / Gold-Parker, Aryeh / Melo, Maurício A / Tassone, Christopher J / Tolentino, Helio C. N / Toney, Michael F / Nogueira, Ana Flávia

    Journal of materials chemistry A. 2020 May 12, v. 8, no. 18

    2020  

    Abstract: Multicomponent perovskites of the type CsₓFA₁₋ₓPb(BryI₁₋y)₃ are good candidates for highly efficient perovskite and tandem solar cells. In this work the degradation mechanisms of these multicomponent films were investigated and our results show that the ... ...

    Abstract Multicomponent perovskites of the type CsₓFA₁₋ₓPb(BryI₁₋y)₃ are good candidates for highly efficient perovskite and tandem solar cells. In this work the degradation mechanisms of these multicomponent films were investigated and our results show that the degradation is a complex process, with the formation of a number of intermediates and lead-based products. In situ X-ray diffraction analysis carried out in the first stages of the degradation indicate that different from MAPbI₃ perovskites, the degradation of these multicomponent films begins with the formation of hexagonal polytypes as intermediates, which in turn are converted to hydrated phases. The initial steps of the degradation were also monitored for the first time by in situ environmental scanning electron microscopy (ESEM) with 75% of relative humidity. In situ ESEM images show that the degradation has its beginning at the “valleys” of the wrinkled morphology found in these films, possibly because of a smaller grain size in these regions. XPS analysis confirms that the hydrated perovskite films continue to react with the environment, leading to the formation of metal hydroxides, carbonates, and oxides as final products. Our results also indicate that the degradation mechanism is highly dependent on the Cs concentration and Br content providing guidance for choosing the best compositions for efficient, but more environmentally stable solar cells.
    Keywords X-ray diffraction ; X-ray photoelectron spectroscopy ; bromine ; carbonates ; chemistry ; hydroxides ; oxides ; relative humidity ; scanning electron microscopy ; solar cells
    Language English
    Dates of publication 2020-0512
    Size p. 9302-9312.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ZDB-ID 2702232-8
    ISSN 2050-7496 ; 2050-7488
    ISSN (online) 2050-7496
    ISSN 2050-7488
    DOI 10.1039/d0ta01201g
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  7. Book ; Online ; Thesis: Scattering and dissociation of simple molecules at surfaces

    Brüning, Karsten

    2000  

    Author's details vorgelegt von Karsten Brüning
    Keywords Silber ; Platin ; Palladium ; Ionenstreuspektroskopie ; Kristallfläche ; Molekülion
    Language English
    Size Online-Ressource (PDF-Datei: 104 S., 8,89 MB), graph. Darst.
    Document type Book ; Online ; Thesis
    Thesis / German Habilitation thesis Univ., Diss.--Osnabrück, 2001
    Database Former special subject collection: coastal and deep sea fishing

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  8. Book ; Thesis: Scattering and dissociation of simple molecules at surfaces

    Brüning, Karsten

    2000  

    Author's details vorgelegt von Karsten Brüning
    Keywords Silber ; Platin ; Palladium ; Ionenstreuspektroskopie ; Kristallfläche ; Molekülion
    Language English
    Size 104 S., graph. Darst., 30 cm
    Document type Book ; Thesis
    Thesis / German Habilitation thesis Univ., Diss.--Osnabrück, 2001
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  9. Article ; Online: Formation of Polymeric Nanocubes by Self-Assembly and Crystallization of Dithiolane-Containing Triblock Copolymers.

    Margulis, Katherine / Zhang, Xiangyi / Joubert, Lydia-Marie / Bruening, Karsten / Tassone, Christopher J / Zare, Richard N / Waymouth, Robert M

    Angewandte Chemie (International ed. in English)

    2017  Volume 56, Issue 51, Page(s) 16357–16362

    Abstract: Template-free fabrication of non-spherical polymeric nanoparticles is desirable for various applications, but has had limited success owing to thermodynamic favorability of sphere formation. Herein we present a simple way to prepare cubic nanoparticles ... ...

    Abstract Template-free fabrication of non-spherical polymeric nanoparticles is desirable for various applications, but has had limited success owing to thermodynamic favorability of sphere formation. Herein we present a simple way to prepare cubic nanoparticles of block copolymers by self-assembly from aqueous solutions at room temperature. Nanocubes with edges of 40-200 nm are formed spontaneously on different surfaces upon water evaporation from micellar solutions of triblock copolymers containing a central poly(ethylene oxide) block and terminal trimethylene carbonate/dithiolane blocks. These polymers self-assemble into 28±5 nm micelles in water. Upon drying, micelle aggregation and a kinetically controlled crystallization of central blocks evidently induce solid cubic particle formation. An approach for preserving the structures of these cubes in water by thiol- or photo-induced crosslinking was developed. The ability to solubilize a model hydrophobic drug, curcumin, was also explored.
    Language English
    Publishing date 2017-11-24
    Publishing country Germany
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2011836-3
    ISSN 1521-3773 ; 1433-7851
    ISSN (online) 1521-3773
    ISSN 1433-7851
    DOI 10.1002/anie.201709564
    Database MEDical Literature Analysis and Retrieval System OnLINE

    Full text online

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  10. Book ; Online: Unraveling the Unconventional Order of a High-Mobility Indacenodithiophene-Benzothiadiazole Copolymer

    Cendra, Camila / Balhorn, Luke / Zhang, Weimin / O'Hara, Kathryn / Bruening, Karsten / Tassone, Christopher J. / Steinrück, Hans-Georg / Liang, Mengning / Toney, Michael F. / McCulloch, Iain / Chabinyc, Michael L. / Salleo, Alberto / Takacs, Christopher J.

    2021  

    Abstract: A new class of donor-acceptor (D-A) copolymers found to produce high charge carrier mobilities competitive with amorphous silicon ($> 1 cm^{2}V^{-1}s^{-1}$) exhibits the puzzling microstructure of substantial local order, however lacking long-range order ...

    Abstract A new class of donor-acceptor (D-A) copolymers found to produce high charge carrier mobilities competitive with amorphous silicon ($> 1 cm^{2}V^{-1}s^{-1}$) exhibits the puzzling microstructure of substantial local order, however lacking long-range order and crystallinity previously deemed necessary for achieving high mobility. Here, we demonstrate the application of low-dose transmission electron microscopy to image and quantify the nanoscale and mesoscale organization of an archetypal D-A copolymer across areas comparable to electronic devices (~ $9 {\mu}m^{2}$). The local structure is spatially resolved by mapping the backbone (001) spacing reflection, revealing nanocrystallites of aligned polymer chains over nearly the entire film. Analysis of the nanoscale structure of its ordered domains suggests significant short- and medium-range order and preferential grain boundary orientations. Moreover, we provide insights into the rich, interconnected mesoscale organization of this new family of D-A copolymers by analysis of the local orientational spatial autocorrelations.

    Comment: 31 pages, 5 main figures, 10 supporting figures
    Keywords Condensed Matter - Materials Science
    Subject code 669
    Publishing date 2021-04-28
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

To top