1. Time-of-flight photoconductivity investigation of high charge carrier mobility in Ti3C2Tx MXenes thin-filmJurij Urbančič, Erika Tomsič, Manisha Chhikara, Nadiia Pastukhova, Vadym Tkachuk, Andraž Mavrič, Gvido Bratina, Egon Pavlica, 2023, izvirni znanstveni članek Opis: Charge transport through a randomly oriented multilayered network of two-dimensional (2D) Ti3C2Tx (where Tx is the surface termination and corresponds to O, OH and F) was studied using time-of-flight photoconductivity (TOFP) method, which is highly sensitive to the distribution of charge carrier velocities. We prepared samples comprising Ti3C2Tx with thickness of 12 nm or 6-monolayers. MXene flakes of size up to 16 μm were randomly deposited on the surface by spin-coating from water solution. Using TOFP, we have measured electron mobility that reached values up to 279 cm2/Vs and increase with electric-field in a Poole-Frenkel manner. These values are approximately 50 times higher than previously reported field-effect mobility. Interestingly, our zero-electric-field extrapolate approaches electron mobility measured using terahertz absorption method, which represents intra-flake transport. Our data suggest that macroscopic charge transport is governed by two distinct mechanisms. The high mobility values are characteristic for the intra-flake charge transport via the manifold of delocalized states. On the other hand, the observed Poole-Frenkel dependence of charge carrier mobility on the electric field is typical for the disordered materials and suggest the existence of an important contribution of inter-flake hopping to the overall charge transport.
Ključne besede: Charge transport in multilayered network of flakes, Time-of-flight photoconductivity, MXene exfoliation, High-mobility solution-cast thin-film, Semiconducting mxene
Objavljeno v RUNG: 31.03.2023; Ogledov: 438; Prenosov: 0
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2. Learning from Nature: Charge Transfer and Carbon Dioxide Activation at Single, Biomimetic Fe Sites in Tetrapyrroles on GrapheneManuel Corva, Fatema Mohamed, Erika Tomsič, Matteo Rinaldi, Cinzia Cepek, Nicola Seriani, Maria Peressi, Erik Vesselli, 2019, izvirni znanstveni članek Ključne besede: carbon dioxide, phthalocyanines, graphene, oxygen, Dirac cones
Objavljeno v RUNG: 03.12.2019; Ogledov: 2693; Prenosov: 0
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3. Substrate- to Laterally-Driven Self-Assembly Steered by Cu Nanoclusters: The Case of FePcs on an Ultrathin Alumina FilmManuel Corva, Fatema Mohamed, Erika Tomsič, Zhijing Feng, Tomas Skala, Giovanni Comelli, Nicola Seriani, Maria Peressi, Erik Vesselli, 2018, izvirni znanstveni članek Ključne besede: copper, nanoclusters, alumina, iron phthalocyanine, Ni3Al
Objavljeno v RUNG: 03.12.2019; Ogledov: 2521; Prenosov: 0
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