90 research outputs found

    SPAD array detectors for parallel photon timing applications

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    Over the past few years there has been a growing interest in monolithic arrays of single photon avalanche diodes (SPAD) for spatially resolved detection of faint ultrafast optical signals. SPADs implemented in CMOS-compatible planar technologies offer the typical advantages of microelectronic devices (small size, ruggedness, low voltage, low power, etc.). Furthermore, they have inherently higher photon detection efficiency than PMTs and are able to provide, beside sensitivities down to single-photons, very high acquisition speeds. In order to make SPAD array more and more competitive in time-resolved application it is necessary to face problems like electrical crosstalk between adjacent pixels

    NEXAFS spectroscopy for the study of structural defects in transferred graphene and related effects on electrical performances of hybrid graphene devices

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    The purpose is to analyze the strain of graphene on copper and after transfer on silicon substrates, evaluating the effect of different transfer methodologies, using NEXAFS spectroscopy combined with RSXRR. Measurements will be performed also on hybrid graphene diodes trying to correlate the strain in graphene film to diode’s electrical performances

    Reactions of Sulphur Monoxide with Organic Substrates

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    Electric transport in gold-covered sodium–alginate freestanding foils

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    The electric transport properties of flexible and transparent conducting bilayers, realized by sputtering ultrathin gold nanometric layers on sodium–alginate free-standing films, were studied. The reported results cover a range of temperatures from 3 to 300 K. In the case of gold layer thicknesses larger than 5 nm, a typical metallic behavior was observed. Conversely, for a gold thickness of 4.5 nm, an unusual resistance temperature dependence was found. The dominant transport mechanism below 70 K was identified as a fluctuation-induced tunneling process. This indicates that the conductive region is not continuous but is formed by gold clusters embedded in the polymeric matrix. Above 70 K, instead, the data can be interpreted using a phenomenological model, which assumes an anomalous expansion of the conductive region upon decreasing the temperature, in the range from 300 to 200 K. The approach herein adopted, complemented with other characterizations, can provide useful information for the development of innovative and green optoelectronics
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