41. Univerza v Novi Gorici, Spremljanje, ugotavljanje in zagotavljanje kakovosti, Poročilo za študijsko leto 2014/2015Martina Bergant Marušič, Aleš Bogovič, Lorena Butinar, IMRE CIKAJLO, Saša Dobričič, Elsa Fabbretti, Renata Kop, Urška Lavrenčič Štangar, Martin Knez, Katja Mihurko, Branka Mozetič Vodopivec, Egon Pavlica, Samo Stanič, Tea Stibilj Nemec, Arthur Stepanov, Boštjan Potokar, Veronika Piccinini, Peter Purg, Aljaž Rener, Nives Štefančič, Ana Toroš, Tanja Urbančič, Vanesa Valentinčič, Aleš Vaupotič, Sabina Zelinšček, 2015, elaborat, predštudija, študija Ključne besede: zagotavljanje kakovosti, visoko šolstvo, univerza Objavljeno v RUNG: 05.02.2018; Ogledov: 4546; Prenosov: 0 Gradivo ima več datotek! Več... |
42. Univerza v Novi Gorici, Spremljanje, ugotavljanje in zagotavljanje kakovosti, Poročilo za študijsko leto 2013/2014Iztok Arčon, Martina Bergant Marušič, Aleš Bogovič, Lorena Butinar, Gvido Bratina, IMRE CIKAJLO, Saša Dobričić, Elsa Fabbretti, Mladen Franko, Renata Kop, Urška Lavrenčič Štangar, Martin Knez, Katja Mihurko, Jana Laganis, Branka Mozetič Vodopivec, Egon Pavlica, Ingrid Petrič, Samo Stanič, Tea Stibilj Nemec, Arthur Stepanov, Boštjan Potokar, Veronika Piccinini, Peter Purg, Aljaž Rener, Nives Štefančič, Ana Toroš, Tanja Urbančič, Vanesa Valentinčič, Aleš Vaupotič, Sabina Zelinšček, 2014, elaborat, predštudija, študija Ključne besede: zagotavljanje kakovosti, visoko šolstvo, univerza Objavljeno v RUNG: 05.02.2018; Ogledov: 4407; Prenosov: 0 Gradivo ima več datotek! Več... |
43. University of Nova Gorica, Self-evaluation report : Institutional Evaluation Programme of the European University AssociationIztok Arčon, Egon Pavlica, Peter Purg, Ana Toroš, Veronika Piccinini, Martina Bergant Marušič, Ingrid Petrič, IMRE CIKAJLO, Lorena Butinar, Deni Drnovšček, elaborat, predštudija, študija Ključne besede: quality assurance, higher education, university, european university association Objavljeno v RUNG: 02.02.2018; Ogledov: 4757; Prenosov: 0 Gradivo ima več datotek! Več... |
44. Evidence of enhanced photocurrent response in corannulene filmsNadya Patukhova, Layla Martin Samos, Egon Pavlica, Gvido Bratina, 2017, izvirni znanstveni članek Opis: Photoconductivity spectra measured in non-crystalline corannulene thin layers are compared to optical absorption in solution phase and thin films. The unexpected enhanced photoconductivity is correlated with GW–BSE theoretical predictions of corannulene gas-phase excitonic spectra. Theoretical analysis reveals a consistent contribution involving transitions to Super Atomic Molecular Orbitals (SAMOs), a unique set of diffuse orbitals typical of curved conjugated constructs. Results suggest SAMO population via direct photoexcitation as a potential mechanism towards exploiting these diffuse orbitals as conducting channels in suitably assembled quantum nanostructures or solids. Ključne besede: Coranulene, photoconductivity, thin layers, photoexcitation Objavljeno v RUNG: 26.09.2017; Ogledov: 4026; Prenosov: 204 Celotno besedilo (644,91 KB) |
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46. Interface-controlled growth of organic semiconductors on grapheneJinta Mathews, Saim Emin, Egon Pavlica, Matjaž Valant, Gvido Bratina, 2017, izvirni znanstveni članek Opis: We have studied submonolayer coverages of N,N-1H,1H-perfluorobutyl dicyanoperylenecarboxydiimide (PDIF-CN2) on mechanically exfoliated graphene transferred onto SiO2 substrates. Our atomic force microscopy (AFM) data show that PDIF-CN2 forms irregularly-shaped 1.4 nm-high islands. From the selected area diffraction performed with transmission electron microscope (TEM) we conclude that this height corresponds to π−π
stacks of molecules, which are inclined for 43° relative to the graphene surface. AFM also showed complete absence of PDIF-CN2 on single-layer graphene (SLG). Electric force microscopy revealed a marked difference in surface charge density between a single-layer graphene and bilayer graphene, with a higher surface charge on SLG than on the bilayer graphene. We associate this behavior with p−
type doping of graphene due to the electrostatic dipole induced by the molecular water layer present at the graphene/SiO2 interface. The crucial role of the graphene/SiO2 interface in determining growth of PDIF-CN2 was further confirmed by TEM examination of PDIF-CN2 deposited onto unsupported SLG. Ključne besede: afm, organic semiconductors, graphene Objavljeno v RUNG: 18.05.2017; Ogledov: 4983; Prenosov: 0 Gradivo ima več datotek! Več... |
47. Fast-Response Photonic Device Based on Organic-Crystal Heterojunctions Assembled into a Vertical-Yet-Open Asymmetric ArchitectureLei Zhang, Egon Pavlica, Zhong, Xiaolan, Liscio Fabiola, LI Songlin, Gvido Bratina, Orgiu Emanuele, Samori Paolo, 2017, izvirni znanstveni članek Ključne besede: organski polprevodniki, merjenja časa preleta, organski fotodetektorji Objavljeno v RUNG: 24.01.2017; Ogledov: 4360; Prenosov: 0 Gradivo ima več datotek! Več... |
48. The role of local potential minima on charge transport in thin organic semiconductor layersEgon Pavlica, Raveendra Babu Penumala, Gvido Bratina, 2016, izvirni znanstveni članek Opis: We have performed a systematic study of dependence of time-resolved photocurrent on the point of charge excitation within the organic semiconductor channel formed by two coplanar metal electrodes. The results confirm that spatial variation of electric field between the electrodes crucially determines transport of photogenerated charge carriers through the organic layer. Time-of-flight measurements of photocurrent demonstrate that the transit time of photogenerated charge carrier packets drifting between the two electrodes decreases with increasing travelling distance. Such counterintuitive result cannot be reconciled with the spatial distribution of electric field between coplanar electrodes, alone. It is also in contrast to expected role of space-charge screening of external electric field. Supported by Monte Carlo simulations of hopping transport in disordered organic semiconductor layer, we submit that the space-charge screens the external electric field and captures slower charge carriers from the photogenerated charge carrier packet. The remaining faster carriers, exhibit velocity distribution with significantly higher mean value and shorter transit time. Ključne besede: Charge transport, Organic semiconductors, Time of flight, Mobility, Traps Objavljeno v RUNG: 23.12.2016; Ogledov: 5576; Prenosov: 0 Gradivo ima več datotek! Več... |
49. A nanomesh scaffold for supramolecular nanowire optoelectronic devicesLei Zhang, Egon Pavlica, Gvido Bratina, 2016, izvirni znanstveni članek Opis: Supramolecular organic nanowires are ideal nanostructures for optoelectronics because they exhibit both efficient exciton generation as a result of their high absorption coefficient and remarkable light sensitivity due to the low number of grain boundaries and high surface-to-volume ratio. To harvest photocurrent directly from supramolecular nanowires it is necessary to wire them up with nanoelectrodes that possess different work functions. However, devising strategies that can connect multiple nanowires at the same time has been challenging. Here, we report a general approach to simultaneously integrate hundreds of supramolecular nanowires of N,N′-dioctyl-3,4,9,10-perylenedicarboximide (PTCDI-C8) in a hexagonal nanomesh scaffold with asymmetric nanoelectrodes. Optimized PTCDI-C8 nanowire photovoltaic devices exhibit a signal-to-noise ratio approaching 107, a photoresponse time as fast as 10 ns and an external quantum efficiency >55%. This nanomesh scaffold can also be used to investigate the fundamental mechanism of photoelectrical conversion in other low-dimensional semiconducting nanostructures. Ključne besede: fotodetektor, organski polprevodnik, fotoprevodnost, organski kristal, elektronske komponente, nanožice Objavljeno v RUNG: 05.10.2016; Ogledov: 5537; Prenosov: 0 Gradivo ima več datotek! Več... |
50. Flexible non-volatile optical memory thin-filmtransistor device with over 256 distinct levelsbased on an organic bicomponent blendGvido Bratina, Egon Pavlica, 2016, izvirni znanstveni članek Opis: Flexible non-volatile optical memory thin-filmtransistor device with over 256 distinct levelsbased on an organic bicomponent blendTim Leydecker1, Martin Herder2, Egon Pavlica3,GvidoBratina3,StefanHecht2*, Emanuele Orgiu1*and Paolo Samorì1*Organic nanomaterials are attracting a great deal of interest for use in flexible electronic applications such as logiccircuits, displays and solar cells. These technologies have already demonstrated good performances, but flexible organicmemories are yet to deliver on all their promise in terms of volatility, operational voltage, write/erase speed, as well asthe number of distinct attainable levels. Here, we report a multilevel non-volatile flexible optical memory thin-filmtransistor based on a blend of a reference polymer semiconductor, namely poly(3-hexylthiophene), and a photochromicdiarylethene, switched with ultraviolet and green light irradiation. A three-terminal device featuring over 256 (8 bitstorage) distinct current levels was fabricated, the memory states of which could be switched with 3 ns laser pulses.We also report robustness over 70 write–erase cycles and non-volatility exceeding 500 days. The device was implementedon a flexible polyethylene terephthalate substrate, validating the concept for integration into wearable electronics andsmart nanodevices. Ključne besede: organic semiconductors
time of flight Objavljeno v RUNG: 22.06.2016; Ogledov: 5731; Prenosov: 0 Gradivo ima več datotek! Več... |