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21.
Crystal structure of CNG mimicking NaK-ETPP mutant in complex with Na+
Matteo De March, L. M. R. Napolitano, S. Onesti, 2015, zaključena znanstvena zbirka raziskovalnih podatkov

Ključne besede: crystal structures, transport protein, Bacillus cereus ATCC 14579
Objavljeno v RUNG: 16.03.2021; Ogledov: 1862; Prenosov: 9
URL Povezava na celotno besedilo

22.
Crystal structure of CNG mimicking NaK-ETPP mutant in complex with Rb+
Matteo De March, L. M. R. Napolitano, S. Onesti, 2015, zaključena znanstvena zbirka raziskovalnih podatkov

Ključne besede: crystal structures, transport protein, Bacillus cereus ATCC 14579
Objavljeno v RUNG: 16.03.2021; Ogledov: 1888; Prenosov: 11
URL Povezava na celotno besedilo

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Crystal structure of CNG mimicking NaK-ETPP mutant cocrystallized with Li+
Matteo De March, L. M. R. Napolitano, S. Onesti, 2015, zaključena znanstvena zbirka raziskovalnih podatkov

Ključne besede: crystal structures, transport protein, Bacillus cereus ATCC 14579
Objavljeno v RUNG: 16.03.2021; Ogledov: 1805; Prenosov: 9
URL Povezava na celotno besedilo

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A pyrrolopyridazinedione-based copolymer for fullerene-free organic solar cells
Astrid-Caroline Knall, Samuel Rabensteiner, Sebastian F. Hoefler, Matiss Reinfelds, Mathias Hobisch, Heike M. A. Ehmann, Nadiia Pastukhova, Egon Pavlica, Gvido Bratina, Illie Hanzu, Shuguang Wen, Renqiang Yang, Gregor Trimmel, Thomas Rath, 2021, izvirni znanstveni članek

Opis: The recent success of non-fullerene acceptors in organic photovoltaics also entails a change in the requirements to the polymer donor in terms of optical and morphological properties leading to a demand for novel conjugated polymers. Herein, we report on the synthesis of a 1,4-bis-(thiophene-2-yl)-pyrrolopyridazinedione based copolymer with 2-ethylhexyl substituents on the pyrrolopyridazinedione moiety. A 2D conjugated benzodithiophene (BDT) was chosen as comonomer. The resulting copolymer T-EHPPD-T-EHBDT showed a molecular weight of 10.2 kDa, an optical band gap of 1.79 eV, a hole mobility of 1.8 × 10−4 cm2 V−1 s−1 and a preferred face-on orientation with regard to the substrate. The comparably wide band gap as well as the determined energy levels (HOMO: −5.47 eV, LUMO: −3.68 eV) match well with the narrow band gap non-fullerene acceptor ITIC-F, which was used as the acceptor phase in the bulk heterojunction absorber layers in the investigated solar cells. The solar cells, prepared in inverted architecture, revealed power conversion efficiencies up to 7.4% using a donor:acceptor ratio of 1 : 1 in the absorber layer.
Ključne besede: non-fullerene solar cells, charge transport, charge mobility, power conversion efficiency
Objavljeno v RUNG: 27.01.2021; Ogledov: 2484; Prenosov: 0
Gradivo ima več datotek! Več...

27.
Molecular alignment on graphene surface determines transport properties of graphene/organic semiconductor transistors
Vadym Tkachuk, Egon Pavlica, Gvido Bratina, 2020, izvirni znanstveni članek

Opis: Graphene field-effect transistor structures were used to investigate the role of molecular alignment on charge transport properties of heterostructures comprising a single-layer graphene and variable thickness of N,N′-bis(n-octyl)-(1,7&1,6)-dicyanoperylene-3,4:9,10-bisdicarboximide (PDI8-CN2) - an n-type organic semiconductor. Our atomic force microscopy data show that under selected growth conditions PDI8-CN2 grows in a layer-by-layer fashion up to a second monolayer. The first layer comprises flat-lying molecules, whereas the molecules in the second layer orient themselves in an upright orientation. Transconductance measurements show that the flat-lying molecules have little effect on the position of the Fermi level in graphene. Upright oriented molecules in the second layer instead, have a strong effect as to neutralize native p-type doping of graphene and cause a shift of charge-neutrality level towards the Dirac point. We interpret such behavior in terms of different orientation of the surface dipole on layers with different molecular orientations. At the same time the overall mobility of the charge carriers reaches values exceeding 3000 cm2/Vs.
Ključne besede: organski polprevodniki, grafen, transport električnega naboja
Objavljeno v RUNG: 13.10.2020; Ogledov: 2562; Prenosov: 0
Gradivo ima več datotek! Več...

28.
Uporaba biometana za transport v sistemu koto
Gregor Drago Zupančič, Mario Panjicko, Goran Lukić, Lea Lavrič, Marko Verbič, elaborat, predštudija, študija

Ključne besede: Bioplin, Biometan, Transport
Objavljeno v RUNG: 04.03.2020; Ogledov: 2807; Prenosov: 0
Gradivo ima več datotek! Več...

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Enhancement of Charge Transport in Polythiophene Semiconducting Polymer by Blending with Graphene Nanoparticles
Egon Pavlica, Gvido Bratina, 2019, izvirni znanstveni članek

Opis: This paper describes a study on the charge transport in a composite of liquid‐exfoliated graphene nanoparticles (GNPs) and a polythiophene semiconducting polymer. While the former component is highly conducting, although it consists of isolated nanostructures, the latter offers an efficient charge transport path between the individual GNPs within the film, overall yielding enhanced charge transport properties of the resulting bi‐component system. The electrical characteristics of the composite layers were investigated by means of measurements of time‐of‐flight photoconductivity and transconductance in field‐effect transistors. In order to analyze both phenomena separately, charge density and charge mobility contributions to the conductivity were singled out. With the increasing GNP concentration, the charge mobility was found to increase, thereby reducing the time spent by the carriers on the polymer chains. In addition, for GNP loading above 0.2 % (wt.), an increase of free charge density was observed that highlights an additional key role played by doping. Variable‐range hopping model of a mixed two‐ and three‐dimensional transport is explained using temperature dependence of mobility and free charge density. The temperature variation of free charge density was related to the electron transfer from polythiophene to GNP, with an energy barrier of 24 meV.
Ključne besede: grafen, polimeri, transport električnega naboja, časovno odvisna fotoprevodnost
Objavljeno v RUNG: 23.08.2019; Ogledov: 2817; Prenosov: 0
Gradivo ima več datotek! Več...

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