1,721,115 research outputs found
All-inkjet-printed thin-film transistors: Manufacturing process reliability by root cause analysis
No full textWe report on the detailed electrical investigation of all-inkjet-printed thin-film transistor (TFT) arrays focusing on TFT failures and their origins. The TFT arrays were manufactured on flexible polymer substrates in ambient condition without the need for cleanroom environment or inert atmosphere and at a maximum temperature of 150 °C. Alternative manufacturing processes for electronic devices such as inkjet printing suffer from lower accuracy compared to traditional microelectronic manufacturing methods. Furthermore, usually printing methods do not allow the manufacturing of electronic devices with high yield (high number of functional devices). In general, the manufacturing yield is much lower compared to the established conventional manufacturing methods based on lithography. Thus, the focus of this contribution is set on a comprehensive analysis of defective TFTs printed by inkjet technology. Based on root cause analysis, we present the defects by developing failure categories and discuss the reasons for the defects. This procedure identifies failure origins and allows the optimization of the manufacturing resulting finally to a yield improvement. © The Author(s) 2016
Up-scaling of the manufacturing of all-inkjet-printed organic thin-film transistors: Device performance and manufacturing yield of transistor arrays
No full textAll-inkjet-printed thin-film transistors (TFTs) have been demonstrated in literature using mainly laboratory inkjet equipment, simple one-channel layout and only a low number of manufactured TFT devices. We report on the development and the up-scaling of the manufacturing of all-inkjet-printed TFT arrays using industrial inkjet equipment. The manufacturing of the TFTs was carried out in ambient condition without the need for cleanroom environments or inert atmospheres and at a maximum temperature of 150°C enabling the use of flexible polymer films as substrate. Arrays of 924 TFTs were manufactured on an area of about DIN A4 (297 × 420 mm2). This allows the consideration of statistics, e.g. to determine the process yield as a function of device design and layout. We present process yields for all-inkjet-printed TTFs up to 82% demonstrating the potential of the developed all-inkjet-printing process. © 2015 Elsevier B.V. All rights reserved
"The sensory buds of Diopatra neapolitana Delle Chiaje, 1841 (Polychaeta: Onuphidae) seen by HRSEM"
No full textPlasma functionalization procedure for antibody immobilization for SU-8 based sensor
No full textIn this paper, we report the study on a new protocol for the immobilization process of antigen/antibody assay on SU-8 layers by oxygen plasma treatment. Plasma treatments, at different plasma powers and for different duration times, are performed and their effects on immobilization efficiency are studied. The chemical properties and the surface morphology of SU-8 before and after the functionalization and immobilization of (IgG) are then verified by Raman spectroscopy and atomic force microscopy (AFM). An increase of the surface roughness of SU-8 layers is observed after the oxygen plasma treatment and an intensity variation of functional groups is also evidenced. To demonstrate the validity of the process the distribution of IgG immobilized on SU-8 surfaces is detected by fluorescence microscopy measurement after incubation with fluorescein isothiocyanate (FITC)-tagged anti-human IgG. An increase of the amount of the adsorbed protein of about 20% and a good repeatability on antigen/antibody distribution on the surface are detected for IgG on plasma treated substrates. Finally, label free measurements are performed by SU-8 optical ring resonators reaching detection limits of 0.86 ng cm−2. The proposed approach offers a smart protocol for IgG immobilization on SU-8 substrate that can be easily extended to different antigen/antibody assay and polymeric materials for the realization of high performance immunosensors. © 2016 Elsevier B.V
“HR-SEM observations on sperm morphology of Diopatra neapolitana Delle Chiaje, 1841 (Polychaeta: Onuphidae)”
No full text
Fine structure of the spermatozoon of Diopatra neapolitana Delle Chiaje, 1841 (Polychaeta: Onuphidae)
No full text
All-inkjet printed organic transistors: Dielectric surface passivation techniques for improved operational stability and lifetime
No full textWe report about the use of a printed pentafluorothiophenol layer on top of the dielectric surface as a passivation coating to improve the operational stability of all-ink-jet printed transistors. Transistors with bottom-gate structure were fabricated using cross-linked poly-4-vinylphenol (c-PVP) as dielectric layer and an ink formulation of an amorphous triarylamine polymer as semiconductor. The resulting TFTs had low turn-on voltage (Vth < |5 V|) and a mobility ≈0.1 cm2/(V s). A comparison of identically fabricated transistors shows that devices with coated dielectric have a higher operational stability than those using bare c-PVP. This conclusion is supported by a quantitative study of the threshold voltage shift with time under continuous operation. Long exposure to the ambient atmosphere causes an increase in the threshold voltage strongly dependent on the used semiconducting ink formulation. © 2015 Elsevier Ltd
Preliminary test of Bragg application for proton therapy using the Geant4 toolkit
Full text linkIn the treatment of tumors, the advantage of proton therapy is the sparing of dose to healthy tissue surrounding the target one, saving it from unnecessary damage. For protons, the dose increases with increasing penetration depth up to the Bragg peak that occurs near the end of the particle's range. This work shows the first results obtained with a specific application, Bragg, which has been developed with the use of the Geant4 package. This application aims to contribute to develop and test innovative treatment planning models for particle therapy. The results from the numerical simulation have been compared with the experimental data in the literature. The validation of models against experimental data is a prerequisite for the use of any application and, therefore, highly demanded
- …
