8,997 research outputs found
High Responsivity and Response Speed Single‐Layer Mixed‐Cation Lead Mixed‐Halide Perovskite Photodetectors Based on Nanogap Electrodes Manufactured on Large‐Area Rigid and Flexible Substrates
No full textAdv. Funct. Mater. 2019, 29, 1901371 In the initially published version of this article, the name of Akmaral Seitkhan was omitted from the final authors list. The correct author list is as follows: Dimitra G. Georgiadou,* Yen-Hung Lin, Jongchul Lim, Sinclair Ratnasingham, Akmaral Seitkhan, Martyn A. McLachlan, Henry J. Snaith, and Thomas D. Anthopoulos* The respective updated author affiliations are as follows: Dr. D. G. Georgiadou, Prof. T. D. Anthopoulos Department of Physics and Centre for Plastic Electronics Blackett Laboratory Imperial College London Exhibition Road, London SW7 2BW, UK E-mail: [email protected]; [email protected] Dr. D. G. Georgiadou, S. Ratnasingham, Dr. M. A. McLachlan Department of Materials and Centre for Plastic Electronics Imperial College London Prince Consort Road, London SW7 2BP, UK Dr. Y.-H. Lin, Dr. J. Lim, Prof. H. J. Snaith Department of Physics University of Oxford Clarendon Laboratory Parks Road, Oxford OX1 3PU, UK A. Seitkhan, Prof. T. D. Anthopoulos Division of Physical Sciences and Engineering King Abdullah University of Science and Technology (KAUST) Thuwal 23955–6900, Saudi Arabia The authors apologize for any inconvenience this error may have caused.</p
High throughput fabrication of nanoscale optoelectronic devices on large area flexible substrates using adhesion lithography
No full textNanoscale optoelectronic devices based on coplanar nanogap electrodes, when compared with traditional vertical devices, exhibit attractive characteristics, such as high density of integration, high sensitivity, fast response and multifunctionality. Moreover, their low-cost high-throughput fabrication on flexible disposable substrates opens up several new applications in sectors ranging from telecommunications and consumer electronics to healthcare - to name a few. However, their commercial exploitation has been hitherto impeded by technological bottlenecks, owing to the incompatibility of currently available fabrication techniques, eg. e-beam lithography, with industrial upscaling. Adhesion lithography is a nanopatterning technique that allows the facile high yield fabrication of coplanar metal electrodes separated by a sub-15 nm gap on large area substrates of any type, including plastic. These electrodes, when combined with solution-processed and/or low-dimensional nanostructured materials deposited at low, plastic-compatible, temperatures give rise to nanoscale optoelectronic devices with intriguing properties. It will be shown that both nanoscale light-emitting and light-sensing devices can be fabricated upon using light-emitting polymers along with self-assembling surface modifiers, and lead halide perovskites and functionalised colloidal PbS quantum dots, respectively. Emphasis will be given in recent advances in flexible nanoscale photodetectors fabricated with nanogap coplanar electrodes, operating in DUV up to NIR part of the spectrum. These devices exhibit high responsivity, sensitivity and fast response speed (hundreds of nanoseconds) owing to the extreme downscaling of key device dimensions. These results demonstrate that adhesion lithography combined with advanced materials concepts constitutes a new fabrication paradigm enabling a plethora of advanced applications within the field of flexible electronics
Adhesion lithography for fabrication of printed radio-frequency diodes
No full textRadio-frequency (RF) diodes are quintessential elements of passive RF identification tags that are used on livestock, luxury objects, and healthcare products. They are also used in near-field communication applications that enable wireless data transfer between devices. An RF diode—when matched to a suitable antenna—picks up the alternating current (AC) signal that is emitted from an RF source and transforms it to a DC signal. The DC signal can then be used to decode the information stored in the tagged object, or to simply power another electronic or optoelectronic device (e.g., a sensor, battery, or LED). The high demand for RF-harvesting devices, however, can only fully be met if their fabrication costs are substantially reduced. To realize this reduction in cost, novel printing technologies that permit manufacturing on large substrates are required. With these technologies it should be possible to ascertain that an increased diode performance (in terms of a small voltage drop, minimum leakage current, and a large gamut of operating frequencies) is attained
Forbidden Colors in the Regulation of Clerical Dress from the Fourth Lateran Council (1215) to the Time of Nicholas of Cusa (d. 1464)
No full textMedieval canon law attempted to distinguish clergy from the laity by restricting their dress choices. The article focuses on prohibition of wearing red or green on the street. Both colors were identified with the nobility.The published version was published as Chapter 7 in Medieval Clothing and Textiles 1Izbicki, Thomas M. (2005), "Forbidden Colors in the Regulation of Clerical Dress from the Fourth Lateran Council (1215) to the Time of Nicholas of Cusa (d. 1464)" in Netherton, Robin and Owen-Crocker, Gale R., eds., Medieval Clothing and Textiles 1 (Boydell Press),105-114ISBN: 9781843831235 (published book
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
Zinc oxide solution-processed Schottky diodes operating at 5G frequencies
No full text5G networks are currently being deployed around the world, introducing a new era in machine-to-machine communications and reinforcing the Internet of Things. The 5G radiofrequency bands range from sub-1 GHz to 70 GHz, while the 6th generation (6G) is expected to cover bands at hundreds of GHz. There is a need for devices with high frequency performance and scalable manufacturing using inexpensive techniques and materials. Herein we present ZnO-based Schottky diodes, processed from solution on wafer scale with high yield. Coplanar nanogap electrodes are fabricated using a high-throughput low-cost technique, named adhesion lithography. The diodes’ cutoff frequency exceeds 100 GHz
Fingerprints of Thomas More's Epigrammata on English Poetry
No full textThomas More’s Latin epigrams, published with the second edition of Utopia in 1518, were apparently widely read both among contemporary European intellectuals and during the subsequent development of English poetry. With a humble audacity that could engage Classical authors in a Christian posture, More cultivated a literary climate that could retain the earthiness of the middle ages in dialogue with the ancients, and is more responsible for the ensuing expansion of vernacular poetry than perhaps any other Henrican author. This thesis probes the Classical influences and Humanist practices at work in the epigrams, explores their contemporary reception on the continent, and traces their legacy among sixteenth- and seventeenth-century English poets
Radio frequency diodes and circuits fabricated via adhesion lithography
No full textThe commercial interest in Radio Frequency Identification (RFID) tags keeps growing, as new application sectors, spanning from healthcare to electronic article surveillance (EAS) and personal identification, are constantly emerging for these types of electronic devices. The increasing demand for the so-called “smart labels” necessitates their high throughput manufacturing, and indeed on thin flexible substrates, that will reduce the cost and render them competitive to the currently widely employed barcodes. Adhesion Lithography (a-Lith) is a novel patterning technique that allows the facile high yield fabrication of co-planar large aspect ratio (<100,000) metal electrodes separated by a sub-20 nm gap on large area substrates of any type. Deposition of high mobility semiconductors from their solution at low, compatible with plastic substrates, temperatures and application of specific processing protocols can dramatically improve the performance of the fabricated Schottky diodes. It will be shown that in this manner both organic and inorganic high speed diodes and rectifiers can be obtained, operating at frequencies much higher than the 13.56 MHz benchmark, currently employed in passive RFID tags and near filed communications (NFC). This showcases the universality of this method towards fabricating high speed p- and n-type diodes, irrespective of the substrate, simply based on the extreme downscaling of key device dimensions obtained in these nanoscale structures. The potential for scaling up this technique at low cost, combined with the significant performance optimisation and improved functionality that can be attained through intelligent material selection, render a-Lith unique within the field of plastic electronics
Designing organic and inorganic ambipolar thin-film transistors and inverters: Theory and experiment
No full textRisteska A, Chan K-Y, Anthopoulos TD, et al. Designing organic and inorganic ambipolar thin-film transistors and inverters: Theory and experiment. Organic Electronics. 2012;13(12):2816-2824
Three American Frontiers: Writings of Thomas D. Clark
No full textThe casual and the serious of American history—fiddlers, yarn spinners, and riverboat gamblers, politicians, educators, and social reformers—have all concerned Thomas D. Clark, celebrated historian of the Western frontier and the changing South. Three American Frontiers, a volume of his selected writings, draws from works produced throughout Clark\u27s long career as a writer, teacher, and lecturer on the frontier West, social change in the South, and the cutting-edge of historical research.
An avid researcher and a tenacious collector of original materials, Clark looks to the everyday items like the record book of a country store, the file of a small-town newspaper, or the diary of a young Gold Rusher for aids to the analysis of larger trends in history. Holman Hamilton conveys Clark\u27s unique approach to his material and his enthusiasm for the common man in America\u27s past.
Among the many books by Thomas Clark are The Rampaging Frontier, The Emerging South, and Pills, Petticoats and Plows.
Holman Hamilton was a reporter and columnist with the Fort Wayne Journal-Gazette before receiving his Ph.D. in history from the University of Kentucky. He was a Guggenheim Fellow, Fulbright Scholar, and professor of history at the University of Kentucky as well as President of the Kentucky Civil War Round Table and University Fellow. He was the author or editor of many books, including Three Kentucky Presidents and Prologue to Conflict.https://uknowledge.uky.edu/upk_united_states_history/1054/thumbnail.jp
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