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Materials OFETs

OFETs constructed on a silicon wafer do not lake advantage of one of the main interest of organic materials, namely the possibility of building electronic devices on plastic substrates. A second important drawback of the silicon-based structure is the difficulty to individually address the gale of transistors built on the same wafer, which would prevent the achievement of integrated circuits. [Pg.258]

Figure 14-13. Evolution of the field-effect mobility of OFETs for five organic materials polythio-phenc (PT) and its derivatives, qualerthiophcne (4T), scxithio-phenc (6T), dihcxyl-sexithiophene (DH6T). and pcntaecnc. Figure 14-13. Evolution of the field-effect mobility of OFETs for five organic materials polythio-phenc (PT) and its derivatives, qualerthiophcne (4T), scxithio-phenc (6T), dihcxyl-sexithiophene (DH6T). and pcntaecnc.
The development of microelectronics cannot be envisaged without a comprehensive modeling of the devices. The modeling of OFETs is currently hampered by several features. First, charge transport in organic semiconductors is still not completely understood. The situation is clear at both ends of the scale. In high mobility materials (//>IOcnr V-1 s l), transport occurs within delocalized levels when temperature... [Pg.263]

We Finally note that the MTR model is a priori more appropriate to disordered materials. It is not expected to give good results with single crystal OFET, especially when the mobility becomes temperature-independent (see Section 14.6.1.2). However, it has recently been invoked in the case of poly thiophene [112], the mobility of which is also thermally activated. [Pg.265]

This section is divided in two parts. In the first one, we review the studies on the transport mechanism in materials used in OFETs, whereby temperature-depen-dent measurements are a very powerful tool. The study of the gate bias dependence has also been used by researchers. In the second part, we present the few analytical models of the organic FETs that have been developed until now. [Pg.575]

The field known as organic or plastic electronics is centered on field effect transistor (FET)-based circuits mounted on large-area and/or flexible substrates. When the semiconductor is organic, the device is referred to as an organic field-effect transistor (OFET). Work on OFET has been extensively reviewed, most notably and comprehensively in Chemistry of Materials and Journal of Materials Research special issues, to which the one of us has contributed three articles [1-3]. [Pg.411]

Differences between baseline and analyte-induced output are magnified if responses of more complex circuits are observed. For example, the frequency of a ring oscillator changes by a larger relative amount in response to analyte exposure than does the mobility of one of its constituent OFET [39]. Although responses to different analytes of a particular semiconductor and sensitivities of different semiconductors to a particular analyte were distinguishable, this selectivity was purely empirical, in no way designed into the active materials of the OFET. [Pg.415]

In the past decade, the research on organic field-effect transistors (OFETs) has experienced remarkable progress mainly because of the development of novel OFET materials, which have allowed to reach carrier mobility values good enough to compete with amorphous silicon. [Pg.32]

Similar to the cases in other small molecules and polymers, most materials composed of phthalocyanine compounds are revealed to work as p-type semiconductors for OFET applications with only few phthalocyanine materials as n-type semiconductors and even less as ambipolar ones. Among the p-type tetrapyrrole semiconductors, monomeric phthalocyanine compounds hold all the trumps with only a few double- and triple-deckers together with some porphyrin derivatives having been reported. [Pg.285]


See other pages where Materials OFETs is mentioned: [Pg.258]    [Pg.267]    [Pg.268]    [Pg.573]    [Pg.574]    [Pg.578]    [Pg.197]    [Pg.557]    [Pg.458]    [Pg.13]    [Pg.28]    [Pg.133]    [Pg.276]    [Pg.276]    [Pg.277]    [Pg.277]    [Pg.278]    [Pg.280]    [Pg.259]    [Pg.19]    [Pg.84]    [Pg.609]    [Pg.302]    [Pg.414]    [Pg.418]    [Pg.32]    [Pg.275]    [Pg.278]    [Pg.278]    [Pg.281]    [Pg.282]    [Pg.283]    [Pg.284]    [Pg.285]    [Pg.291]    [Pg.293]    [Pg.294]    [Pg.295]    [Pg.296]    [Pg.296]    [Pg.300]   
See also in sourсe #XX -- [ Pg.491 ]




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