Author Archives: pavlica

Graphene flakes at the SiO2/organic-semiconductor interface for high-mobility field-effect transistors

Our group published new research in collaboration with colleagues from Max Planck Institute from Mainz. We demonstrated that high-transconductance organic thin film transistors can be achieved by depositing electrochemically exfoliated graphene flakes at the gate-dielectric/organic semiconductor (OS) interface. This effect … Continue reading

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Effect of Water Layer at the SiO2/Graphene Interface on Pentacene Morphology

Atomic force microscopy has been used to examine early stages of pentacene growth on exfoliated single-layer graphene transferred to SiO2 substrates. We have observed 2D growth with mean height of 1.5 ± 0.2 nm on as-transferred graphene. Three-dimensional islands of … Continue reading

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Graphene-induced Enhancement of N-type Mobility in Perylenediimide Thin Films

In collaboration with the University of Strasbourg and ISOF-CNR Bologna, Italy, our group published results of a study of graphene/organic semiconductor composites. Organic thin-film transistor transfer characteristics and time-of-flight (TOF) photoconductivity measurements were used to investigate the effect of the … Continue reading

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Pentacene on graphene: Differences between single layer and bilayer

Using atomic force microscopy we have examined morphology of sub-monolayer thick pentacene layers, deposited on exfoliated single-layer and bilayer graphene, transferred onto SiO2. We observe two-dimensional island growth in the range of substrate temperatures from 10 to 60 °C. We find … Continue reading

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Influence of Solid-State Microstructure on the Electronic Performance of TES-ADT

Together with Imperial College, Holst Centre, ICMM Madrid, University of Kentucky and ETH Zürich  we have been investigating electric transport properties of  5,11-bis(triethylsilylethynyl) anthradithiophene (TES ADT). TES ADT– one of the most promising, solution-processable small-molecular organic semiconductors – was analyzed, … Continue reading

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Influence of transfer residue on the optical properties of chemical vapor deposited graphene investigated through spectroscopic ellipsometry

Graphene is the material of the future. Our group in collaboration with Serbian partners have examined the effects of transfer residue and sample annealing on the optical properties of chemical vapor deposited graphene, transferred onto a sapphire substrate. The optical … Continue reading

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Photo-induced intramolecular charge transfer in an ambipolar field-effect transistor based on a π-conjugated donor–acceptor dyad

Our research team collaborated in a photoconductivity characterization of an interesting dyad molecule. A π-conjugated tetrathiafulvalene-fused perylenediimide (TTF-PDI) molecular dyad is successfully used as a solution-processed active material for light sensitive ambipolar field-effect transistors with balanced hole and electron mobilities. … Continue reading

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Extreme sensitivity to adsorbates of Time-of-Flight photoconductivity in graphene

We have examined the effect of submonolayer coverage of 1-pyrene butyric acid on charge carrier transport in reduced graphene oxide. We have modeled the interaction of 1-pyrene butyric acid molecules with graphene and determined the amount of charge transfer at … Continue reading

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Graphene Workshop

We are proud to announce Graphene Workshop 2013 – from fundamental properties to application, which will be hosted in our Laboratory from 8th to 11th April 2013.

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Grafold-driven nucleation of pentacene on graphene

Folds in graphene – grafolds are frequently present even after transferring graphene layers, which were fabricated by chemical vapor deposition (CVD), onto SiO2 substrates. As we are showing in the present Letter, grafolds have a crucial role in determining the … Continue reading

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