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Topic: OFETs

	Odor sensing with organic transistors - Patent 6484559
		OFETs have been described in the literature and the teachings of these references as to the manufacture of these transistors and their reported characteristics are incorporated herein by reference.
		After an OFET is subjected to an odor signal, applying an electrical bias cycle to the gate of an OFET facilitates its recovery to the condition existing prior to the application of the odor.
		This is in sharp contrast to the response of the discrete OFET shown in FIG.
	www.freepatentsonline.com /6484559.html (7950 words)

	OFET structures with both n- and p-type channels - Patent 7045814
		The dual OFET structure of claim 1, wherein one of said source and drain electrodes is a source or drain electrode for a channel in said p-type semiconductor layer and for a channel in said n-type semiconductor layer.
		The dual OFET structure of claim 1, wherein said one organic semiconductor layers is between said another one of said organic semiconductor layers and said source and drain electrodes.
		The total resistance of the n-type and p-type OFETs 140, 142 are influenced by the choice of materials used for the n-type and p-type organic semiconductor layers 105, 110, as well as the dimensions of the components of the OFETs 140, 142.
	www.freepatentsonline.com /7045814.html (4770 words)

	OPUS - New fluorene based materials for organic electronics
		The clearing temperature can be tailored by varying the molecular weight of the oligomers between 80 °C and 288 °C. A plot of the reciprocal polymerisation degree versus the clearing temperature of these oligomers with different degree of polymerisation results in a clearing temperature of 366 °C for the ideal polymer.
		Dadurch wurde eine neue aus Lösung verarbeitbare Materialklasse für den Einsatz in OFETs erschlossen.
		Drei der hergestellten Trimere wurden in OFETs getestet.
	opus.ub.uni-bayreuth.de /volltexte/2005/189 (1353 words)

	Method for the production and configuration of organic field-effect transistors (OFET) (Site not responding. Last check: 2007-10-29)
		Moreover, the invention relates to a method for producing and patterning an OFET by printing at least one functional polymer onto a substrate, the functional polymer first being applied in an ink-like consistency and then being printed onto the substrate.
		The invention provides a cost-effective and precise method for producing and patterning OFETs by utilizing the solubility of at least one functional polymer of an OFET insofar as the functional polymer is applied to the prepared OFET or a substrate like an ink by means of a conventional printing method.
		In contrast to the conventional method, by means of which only the conductor layer of an OFET can be patterned and the other layers of the OFET remain unpatterned, the printing process proposed by the invention is not material-specific, i.e.
	typhoon.he.net /~sella001/patents/6852583.html (1108 words)

	clavijocedeno (Site not responding. Last check: 2007-10-29)
		The applications include organic field-effect transistors (OFETs) as well as molecular devices where the interelectrode separation is defined by the thickness of a self-assembled molecular layer.
		In the case of OFETs, the channel length of the devices is in the range from 70 µm down to 50 nm.
		In the case of OFETs, a different behavior was found when comparing results on devices produced by drop casting and spin coating.
	elpub.bib.uni-wuppertal.de /edocs/dokumente/fbe/elektrotechnik/diss2004/clavijocedeno (459 words)

	IEEE FORMS WORKING GROUP TO DEVELOP STANDARDS FOR ORGANIC AND MOLECULAR ELECTRONICS
		The working group's first task will be to formulate a standard for evaluating organic transistors, or organic field effect transistors (OFET), which promise to deliver economical circuitry for high-volume applications not viable in silicon.
		The flexibility, light weight and low cost of OFETs suggest such uses as roll-up flat panel displays, smart cards and biometric sensors in the near term, and has the potential for radio-frequency tags for checking out groceries, tracing luggage at airports and tracking people at secure installations as the technology continues to develop.
		OFET devices promise to be much easier to produce than silicon-based field effect transistors.
	standards.ieee.org /announcements/p1620wg.html (881 words)

	Jad Rasul - Research
		Organic Field Effect Transistors (OFETs), whose characteristics are modulated by an electric filed, are a prominent constituent of modern microelectronics.
		OFETs are particularly interesting as their fabrication processes are more cost effective and much less complex compared with conventional silicon technology, In general, low-temperature deposition and solution processing can replace the high-temperature and high-vacuum deposition and sophisticated photolithographic pattering involved in conventional silicon technology.
		Research into OFET gate insulators is beginning to receive increased attention and is rapidly establishing itself as a line of research equally for organic electronics as the ‘traditional’ OFET research themes that address the organic semiconductor itself, and circuit engineering.
	www.uic.edu /labs/AMReL/resJad.htm (560 words)

	ORFID Corporation
		In general, the performance of traditional organic field effect transistors (OFETs) is poor compared to inorganic transistors, as evidenced by the low current output and high operating voltages of OFETs.
		Conventional OFET device design puts practical limits on the channel length as well as the area cross section for the source—drain current.
		Additionally, conventional OFETs require the gate to be located between the source and the drain.
	www.orfid.com /tech-vofet.htm (517 words)

	SSCS Quarterly, January 2004 - Application-Driven Organic Electronics Workshop
		It is clear that one of the major challenges to move organic electronics from the research lab to commercial viability is the convergence on a single process flow.
		Near the top of the list is the requirement for a large on-to-off current ratio for the OFET and small dark current in the OPD to insure high sensitivity for the detector.
		To relax the initial requirements on the OFETs, it was suggested to start with displays showing fixed format graphics and then moving to full motion video.
	www.ieee.org /organizations/pubs/newsletters/sscs/jan04/workshop.html (1099 words)

	Logic components from organic field effect transistors patent invention (Site not responding. Last check: 2007-10-29)
		This is primarily due to the early saturation effect of OFETs having very thin semi-conducting layers, and, furthermore, to the use of OFETs having specific properties as the organic logic components and to a novel layout of the circuit containing these logic components.
		This provides an OFET that can be switched on by a negative gate potential and switched off by a positive gate potential (like an n-type transistor).
		The basic element of these logic devices is the connection of at least two OFETs in series of which the flow channels are of different dimensions such that without a gate potential the flow channel of one of the OFETs is distinctly more conductive than that of the other OFET.
	www.freshpatents.com /Logic-components-from-organic-field-effect-transistors-dt20051215ptan20050277240.php (1393 words)

	Organic Semiconductors at Ohio U (Site not responding. Last check: 2007-10-29)
		Worldwide, both academic and industrial research on thin film organic Field-Effect Transistors (OFETs) aims at investigating this alternative to traditional semiconducting devices for a variety of applications.
		As seen in the current-voltage characteristics, when the lower contact is the drain, there is a cross-over point where we observe n-type behavior.
		Although the demonstration of this ambipolar charge transport was realized for a pentacene OFET on SiO2/Si substrate, the fabrication process may be used for a variety of substrates and for other organic materials as well.
	www.phys.vt.edu /~soghomon/organicVS1.htm (355 words)

	Paper-thin product partnership could create some thick profits, Small Times - October 17, 2002
		The presentation was part of the "Nanotechnology Business Roadmap for Industry," a meeting that has drawn several hundred participants from industry, government and academia to talk about the industrialization of nanotechnology.
		Printable OFETs are the kind of gadgetry that could make it possible to print instantly updateable newspapers (á la "Minority Report"), or (in a more present-day application) inexpensive radio-frequency tags for inventory control, which are highly coveted by the retail industry.
		Motorola, Dow Chemical and Xerox Corp. are partnering to commercialize printable OFETs, with the blessing of the National Institute of Standards and Technology.
	www.smalltimes.com /articles/stm_print_screen.cfm?ARTICLE_ID=268266 (739 words)

	National Synchrotron Light Source
		Electron transport across an interface might be controllable by chemically bonding monolayer films to a substrate surface; one possible application is in organic field effect transistors (OFETs), which necessitate a film that is dense and ordered.
		One such possible application of surface-bound monolayers is for organic field effect transistors (OFETs), for use in “next generation” electronic devices.
		An interesting observation for OFETs is that most of the charge transport occurs through the first few electroactive organic monolayers.
	www.nsls.bnl.gov /newsroom/science/2004/07-Schwartz.htm (798 words)

	SUFRAMA MINAPIM News
		Fabrication of OFETS using organic materials requires organic semiconductors, insulators (or dielectric), conductors and substrates.
		It has recently been demonstrated by scientists at Avecia [3] that the performance of an amorphous OSC in an OFET is strongly dependent on the dielectric due to changes in ordering of the semiconductor layer.
		OFETS and beyond With interest from electronics companies mounting, the commercial application of plastic electronics in OFETs may now only be a few years away.
	www.suframa.gov.br /minapim/news/visArtigo.cfm?Ident=92&Lang=EN (1233 words)

	Michigan Small Tech - News
		While the standards will be based on those used in the rest of the electronics industry, existing silicon standards may not be adequate for measuring a production method so different from the usual lithographic techniques.
		In contrast, a single facility to print OFETs would cost about $400,000, and a whole industry's worth of facilities would probably run about $40 million by 2007.
		Gamota predicted that the first applications for printable OFETs will be primitive and in the toy and novelty area where precision and longevity aren't critical.
	www.michigansmalltech.com /news/detail.asp?contentid=D73F1A57-536C-4AAB-B73F-9F844FBC6506 (664 words)

	564c Probing Organic Field Effect Transistors (Ofets) in-Situ Using Sfg (Site not responding. Last check: 2007-10-29)
		Organic field effect transistors (OFET) have attracted considerable attention recently as an enabling component for “organic” or “plastic” electronics.
		However, considerable challenges in organic semiconductors such as low mobility, irreproducible electrical characteristics and long term stability need to be overcome for OFETs to gain widespread acceptance.
		We observe remarkable correlations between trends in the SFG spectra and electrical properties of the transistor, with varying gate voltage (VG).
	www.nt.ntnu.no /users/skoge/prost/proceedings/aiche-2006/data/papers/P69827.HTM (193 words)

	:: Welcome to Marius Prelipceanu Webpages ::
		The device is far from being optimized and understood due to not well understood phenomena like prevailing hopping transport [8], existence of small polarons [9] and the existence of field- dependent mobility [10].
		At present state of the art, the OFETs are modelled using the approaches used in a-Si:H, i.e multiple trapping with at most modified by the hopping transport path[11].
		The purpose of the present paper is to bring some insight into the micro physics of FETs using the modelling, starting from the realistic parameters of the seiconductor used.
	www.tfh-wildau.de /iplpt/eurofet/page/ofet.htm (1245 words)

	Organic-inorganic electronics
		Luminous efficiencies in excess of 30 lm/W and operating voltages as low as 4 V have been reported [5, 6].
		For OFETs, the inherent upper bound on electrical mobility translates to a cap on switching speeds and therefore on the types of applications that might employ the low-cost organic devices.
		In OFET devices, the mobility of the organic channel layer is strongly affected by the degree of molecular ordering of the oligomer layer.
	www.research.ibm.com /journal/rd/451/mitzi.html (6798 words)

	Organische Feldeffekt-Transistoren: strukturelle und dynamische Eigenschaften / SPP 1121
		In an Organic Field Effect Transistor (OFET) at least the active layer consists of semiconducting organic material, either in form of single molecules or polymers.
		OFETs are the basis of ”low cost-low performance” molecular electronics.
		Key questions are related to the deposition and the structuring of thin layers, the problem of attaching metallic contacts, the long-term stability as well as optimal dynamic electronic properties of OFET devices.
	www.innovations-report.com /html/reports/dfg_engineering_science/report-21534.html (318 words)

	Monolayer to Multilayers Nanostructural Evolution in N type Oligothiphenes: Implications for OFET Performance
		This study elucidates the nature of the interface between the organic semiconductor and source-drain electrodes in OFET devices.
		Reorientation of the molecules in multilayers by 90° results in efficient stacking and overlap of pi orbitals with an associated increase in top contact OFET mobility by three orders of magnitude.
		This event is not open to the general public and NSTI reserves the right to refuse admission and participation to any individual.
	www.nsti.org /Nanotech2007/showabstract.html?absno=1082 (147 words)

	Title page for ETD etd-11282005-154426
		It is demonstrated that the chemical species in ambient environment can affect organic electronics properties on bulk, interface and electric contact.
		It is demonstrated that drain and source contact resistances can be calculated separately with modified four-point-probe measurements, and contact resistance and material bulk resistance are actually modulated by the gate electric field.
		A new model of oxygen doping has been suggested and it is demonstrated that oxygen doping can affect all the resistance components in P3HT OFETs.
	etd.gatech.edu /theses/available/etd-11282005-154426 (223 words)

	View Grant Details
		In some cases, what would represent good materials characteristics for one type of device may be highly detrimental to the efficiency of another.
		Intermolecular pi-pi interactions symbolise one good example: in organic light emitting devices, photoluminescence is quenched by these attractions and the device efficiency is reduced dramatically; in organic field effect transistors (OFETs), it is desirable to promote pi-pi interactions throughout the bulk, so that charge mobility can be maximised.
		The novelty in this work originates from very recent results, in which we demonstrate that highly soluble materials with conformational freedom in solution are able to self-assemble in the solid state to give highly planar and conjugated structures.
	gow.epsrc.ac.uk /ViewGrant.aspx?GrantRef=EP/E02730X/1 (217 words)

	1. Physikalisches Institut, Universitaet Stuttgart - Eigenschaften zweidimensionaler Elektronen Gase in organischen ... (Site not responding. Last check: 2007-10-29)
		Electrons limited to a very thin layer (two-dimensional electron gas) in an organic semiconductor play an important role in Organic Field Effect Transistors (OFETs), which are the key device for low-cost and flexible plastic electronics.
		Beyond that organic semiconductors are interesting materials for the physics of interacting electron systems due to their low dielectric constant and their high effective mass, which is not found in common semiconductors.
		A adapted version of those OFETs will be used as samples for the optical measurements.
	www.pi1.physik.uni-stuttgart.de /research/Nanophysik/OrganischeHalbleiter_e.php (790 words)

	Perfluoropentacene: High-Performance p-n Junctions and Complementary Circuits with Pentacene (Site not responding. Last check: 2007-10-29)
		Perfluoropentacene is a planar and crystalline material that adopts a herringbone structure as observed for pentacene.
		OFETs with perfluoropentacene were constructed using top-contact geometry, and an electron mobility of 0.11 cm
		Bipolar OFETs with perfluoropentacene and pentacene function at both negative and positive gate voltages.
	www.pubs.acs.org /cgi-bin/abstract.cgi/jacsat/2004/126/i26/abs/ja0476258.html (170 words)

	NEW IEEE TESTING STANDARD SUPPORTS PRODUCTION OF LOW-COST PLASTIC TRANSISTORS
		OFETs promise to deliver economical circuitry for high--volume
		Their flexibility, light weight and low cost suggest such uses as roll-up flat panel displays, smart cards, biometric sensors and radio-frequency identification (RFID) tags for uses such as monitoring inventories, checking out groceries, tracing luggage at airports, and tracking people at secure installations.
		"As OFETs move toward commercialization," he says, "material and equipment suppliers, circuit designers and system manufacturers need universal test methods so data taken at one facility can be used during the product development cycle.
	standards.ieee.org /announcements/pr_1620.html (542 words)

	Probing Organic Field Effect Transistors (Ofets) in-Situ Using Sfg (Site not responding. Last check: 2007-10-29)
		Organic field effect transistors (OFET) have attracted considerable attention recently as an enabling component for “organic” or “plastic” electronics.
		Plastic electronics has several advantages over silicon based electronics in terms of the possibility of low cost, roll to roll processing and the development of electronics on flexible substrates.
		We observe remarkable correlations between trends in the SFG spectra and electrical properties of the transistor, with varying gate voltage (VG).
	aiche.confex.com /aiche/2006/techprogram/P69827.HTM (223 words)

	pmTUC Titel
		The industrial production of polymer electronics (esp. oFET applications) using known mass printing technologies, however, is object of another research project, the PEP project (Polymer Electronic Printing).
		The advantage of this technology is its potential to produce electronic devices in a cost-efficient and productive way, since the organic materials can be processed from solution.
		In comparison to inorganic field effect transistors, OFETs have various intrinsic disadvantages.
	www.tu-chemnitz.de /mb/PrintMedienTech/pmforschung_en/polymer_en.php (1426 words)

	<Jianglong Chen>
		Growing interest in organic electronic and optoelectronic devices is sustained by continuing demonstrations of striking display application based on organic light emitting devices (OLEDs) and the promise of organic field effect transistor (OFET) circuits for ubiquitous electronics.
		We will introduce the first generation molecular jet (MoJet), a high resolution organic and metal thin film p attern ing technique, and its application in fabricating 8 00dpi OLED s with 30µm pixels and OFETs with 15µm wide channels.
		T he operating properties of MoJet printed OLED and OFET devices are shown to be comparable to the performance of those fabricated by conventional vacuum deposition through a metal stencil.
	www.rle.mit.edu /cips/JianglongChen.htm (221 words)

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