1,721,032 research outputs found
Organic semiconducting single crystals as novel room temperature, low cost solid-state direct X-ray detectors
No full textCONTENTS
11.1 Introduction................................................................................................... 243
11.2 Organic Semiconducting Single-Crystal Growth..........................................246
11.3 Organic Semiconducting Single-Crystal Properties.....................................249
11.4 X-Ray Electrical Photoresponse.................................................................... 252
11.5 Conclusions and Outlook............................................................................... 255
Acknowledgments...................................................................................................256
References...............................................................................................................25
Organic semiconducting single crystals as novel room temperature, low cost solid-state direct X-ray detectors
No full textCONTENTS
11.1 Introduction................................................................................................... 243
11.2 Organic Semiconducting Single-Crystal Growth..........................................246
11.3 Organic Semiconducting Single-Crystal Properties.....................................249
11.4 X-Ray Electrical Photoresponse.................................................................... 252
11.5 Conclusions and Outlook............................................................................... 255
Acknowledgments...................................................................................................256
References...............................................................................................................25
Boron Trifluoride-assisted Reactions of 1-Benzothiophen-3(2H)-one with Various Ketones: a Convenient Entry to 2-Methylene-1-benzothiophen-3(2H)-one and/or 6H-Di[1]benzothieno[3,2-b:2,3-e]pyran Derivatives
No full textThe title compounds are obtained in moderate to high yields by BF3-assisted reaction of
1-benzothiophen-3(2H)-one with nine ketones in diethyl ether at room temperature; the relative amounts of
pyran 1 and ylidene 2 prove to be dependent upon electronic and steric factors
Fast fabrication over large areas of P3HT nanostructures with high supramolecular order
No full textThe fabrication of P3HT nanopatterns (lamellae and fibres) within a few minutes, in standard laboratory
conditions (i.e., at room temperature and in air) and over areas as large as cm2, is reported. The
nanostructures are prepared using a wet-processing method. A satisfactory control over the pattern
topology (lamellae, hierarchically connected and parallel fibres, entangled but disconnected and quasiparallel
fibres, randomly oriented fibres) is obtained by simply changing one process parameter. UV-vis
spectroscopy and X-ray diffraction analyses carried out over the so-fabricated structures evidence a very
high degree of supramolecular organization of the polymeric chains. Such a degree of order is similar or
even better than that of P3HT samples treated with thermal or solvent annealing procedures
Low-cost and Fast Wet-based Technique to Generate Nanostructured Organic Materials Layers and its Application to Chemiresistive Gas-sensing Devices
No full textAbstractNanostructured materials for sensors and transducers are of great interest to the scientific community due to several advantages that these materials can provide (e.g., integration with large scale manufacturing technologies, enhanced performances, etc.). Nonetheless, large-area, low-cost and fast processing technologies for creating effective sensing nanostructures are still sought for. In this work, a recently described technique called Auxiliary Solvent-Based Sublimation-Aided NanoStructuring (ASB-SANS) has been used to generate poly(3-hexylthiophene) (P3HT, a well known semiconducting polymer) nanofilamentary structures onto interdigitated electrodes. These have been tested as gas sensing layers for volatile organic compounds, delivering promising results
organic single crystals an essentials step to new physics and higher performances of optoelectronic devices
No full textSCOPUS: re.jFLWINinfo:eu-repo/semantics/publishe
Ionizing Radiation Detectors Based on Solution-Grown Organic Single Crystals
No full textOrganic single crystals (OSCs) have ideal qualities (well defi ned structure and
morphology, lack of grain boundaries, high purity, 3D long range order, good
electronic transport properties) for several technological applications, in particular
as key components for electronic devices. It is only recently that OSCs
have been considered as ionizing radiation detectors, and the latest developments
in this fi eld are here reported. In the fi rst section, various methods for
OSC growth are described, with emphasis on cost-effective, solution-based
approaches capable of delivering large volume, well performing crystals. The
second section is focused on the use of solution-grown OSCs as scintillators
(i.e., as high energy photon to UV–vis photon conversion), highlighting
the ability of cm-scale OSCs to effectively detect neutrons and to carry out
neutrons-gamma pulse-shape discrimination tasks. Finally, the third section
describes the use of semiconducting, solution-grown OSCs as effective
solid state direct detectors (i.e., directly converting high energy photons into
charge carriers), evidencing extremely promising performances in terms of
operability in environmental conditions (i.e., no need for encapsulation),
radiation hardness, linear response and low operating voltage
Frontiers of photovoltaic technology: A review
No full textAs photovoltaics (PV) cost reduction driven by economies of scale is approaching a limit, technological breakthroughs are likely to become again the next driver for further growth. In this paper, we review the most significant photovoltaic (PV) device technologies. First, commercially available cells and modules are briefly surveyed, focusing on the innovations that have recently reached the market, both in silicon-based and thin-film devices. We then identify some significant pre-market technologies such as organic PV and dye-sensitized solar cells, outlining the advantages as well as the obstacles that still hinder large-scale commercialization. A critical review is finally presented for the most promising approaches and some emerging technologies currently under investigation for simultaneously meeting the three key objectives in PV research, all aiming at further reducing the cost per kWh: low fabrication cost, systems integration, and overcoming the standard limit for photoconversion efficiency. All approaches heavily rely on nanotechnology, as the key mechanisms involved in PV conversion occur at the nanoscale
Organic semiconducting single crystals as solid-state sensors for ionizing radiation
No full textSo far, organic semiconductors have been mainly proposed as detectors for ionizing radiation in the indirect conversion approach, i.e. as scintillators, which convert ionizing radiation into visible photons, or as photodiodes, which detect visible photons coming from a scintillator and convert them into an electrical signal. The direct conversion of ionizing radiation into an electrical signal within the same device is a more effective process than indirect conversion, since it improves the signal-to-noise ratio and it reduces the device response time. We report here the use of Organic Semiconducting Single Crystals (OSSCs) as intrinsic direct ionizing radiation detectors, thanks to their stability, good transport properties and large interaction volume. Ionizing radiation X-ray detectors, based on low-cost solution-grown OSSCs, are here shown to operate at room temperature, providing a stable linear response with increasing dose rate in the ambient atmosphere and in high radiation environments. © The Royal Society of Chemistry 2014
Fast Fabrication of Large-Area, Nanostructured Arrays from Polymers or Carbon Nanotubes by Wet-Processing
No full textA novel, fast, and low-cost method for fabricating large-area arrays of organic-material-based filamentary nanostructures is presented. The technique, auxiliary solvent-based sublimation-aided nanostructuring (ASB-SANS), only takes minutes and exploits a templating matrix easily removable by sublimation. Proof-of-concept patterns fabricated out of poly(methylmethacrylate) (PMMA) and carbon nanotubes (CNTs) are demonstrated
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