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Organic-based field-effect transistors: Critical analysis of the semiconducting characteristics of organic materials (1991)

Garnier, Francis ; Peng, Xuezhou ; Horowitz, Gilles ; [et al.]

Springer

Molecular engineering 1 (1991), S. 131-139

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ISSN: 1572-8951

Keywords: Organic-based devices ; molecular semiconductors ; field-effect transistors ; charge transfer

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Notes: Abstract Conjugated polymers, e.g., polyacetylene and polythiophenes, conjugated thiophene oligomers and metallophthalocyanines have been proposed in the literature as organic semiconductors for the fabrication of organic-based field-effect transistors, FET. The poor performances generally shown by these FET have been attributed to the very low carrier mobility in organic semiconductors, and the improvement of this parameter has been the objective of a large number of works. The analysis of the mode of operation of organic-based FET, which operate through the formation of an accumulation layer, shows that an ohmic contribution has to be taken into account in the total observed current output of the devices. The conductivity of the organic semiconductor plays thus a significant role in the FET characteristics, although this point has been up to now rarely considered. In this regard, most of the claims in the literature about high mobility achievements are shown to be of limited significance. Conjugated oligomers are actually the only class of organic semiconductors presenting high mobility together with low conductivity, which, furthermore, indicates that interchain transfer of charge may be a much more efficient process than generally believed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00420049

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Functionalized Conducting Polymers - Towards Intelligent Materials (1989)

Garnier, Francis

Weinheim : Wiley-Blackwell

Advanced Materials 1 (1989), S. 117-121

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ISSN: 0935-9648

Keywords: Molecular Electronics ; Wires ; Sensors ; Transducers ; Polymer Modified Electrodes ; Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: Organic conjugated polymers and oligomers constitute a three-dimensional network of molecular wires, in which all monomeric units can be functionalized with various prosthetic groups. By varying the nature of these groups, specific interactions with external physical or chemical phenomena can be developed in these materials, leading to molecular devices such as sensors, transducers, memories and logic operators. Chemists have already mastered the realization of many of these functional elements, which mimic those existing in organized beings. The further assembly of these elements in multifunctionalized organic conducting polymers and oligomers will represent the next step towards intelligent materials.

Additional Material: 3 Ill.