All-organic field effect transistor

Parashkov, R. et al.. Flexible all-organic field effect transistors fabricated by electrode peehng transfer, Jpn. J. Appl. Phys. 43, L130-132, 2004. 

P. Cosseddu and A. Bonfiglio. 2007. A comparison between bottom contact and top contact all organic field effect transistors assembled by soft lithography. Thin Sold Films 515 7551-7555. 

Contacts are the elementary building blocks for all electronic devices. These include interfaces between semiconductors of different doping type (homojunc-tions) or of different composition (heterojunctions), and junctions between a metal and a semiconductor, which can be either rectifying (Schottky junction) or ohmic. Because of their primary importance, tire physics of semiconductor jrmc-tions is largely dealt with in numerous textbooks [11, 12]. We shall concentrate here on basic aspects of the metal-semiconductor (MS) and, above all, metal-insulator-semiconductor (MIS) junctions, which are involved in the organic field-effect transistors. 

The first section of the book is devoted to industrial applications. In two articles written by two of the major companies active in this field, PolylC and Evonik, the applications that presently attract the most interest fi om a commercial point of view are described. At the same time, the key problems related to the manufacturing of cheap electronics through a printing process are addressed. These two chapters provide an excellent introduction to the more applied aspects of the field and also define the Ifamework for the following chapters in the book, which all address problems that in one way or the other are related to producing organic field effect transistors and to improving their performance and stability. 

H. Rost, J. Ficker, J. S. Alonso, L. Leenders and I. McCulloch. Air-stable all-polymer field-effect transistors with organic electrodes. Synth. Met. 145(1), 83-85 (2004). 

The organic field effect transistor (OFET) acts essentially as an electronic valve by modulating the semiconductor channel conductance via the gate field. This device is essential in all electronic applications, including integrated circuits for memories and sensors and also to drive individual pixels in active matrix displays. Probably one of the most exciting applications of organic electronic circuits is in the supply chain area, where radiofrequency-powered elements (e.g. RFID tag) may replace ID barcodes for identification and be applicable as a backplane drive for displays. 

Guo Y, Yu G, Liu Y (2010) Functional organic field-effect transistors. Adv Mater 22 4427-4447 Hasegawa T, Takeya J (2009) Organic field-effect transistors using single crystals. Sci Technol Adv Mater 10(2) 024314 He Q, Wu S, Gao S, Cao X, YinZ, Li H, Chen P, Zhang H (2011) Transparent, flexible, all-reduced graphene oxide thin film transistors. ACS Nano 5 5038-5044... 

Functionalization of pentacene with the specific aim of improving performance in devices is a recent endeavor - the first use of a functionalized pentacene in a field-effect transistor was reported only recently (2003) [26], Functionalization of pentacene has led to the ability to engineer the solid-state arrangement, electronic, and solubility properties of this important semiconductor and to improve its stability and film-forming ability. Recent functionalized pentacene materials have yielded devices with properties comparable with those of the parent acene, have enabled the formation of devices from solution-deposited films, and have even changed the semiconductor behavior of this organic molecule from p-type to n-type. As functionalization strategies are refined, materials with all of the properties necessary for commercial device applications should soon be developed. 

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