Sensitive Organic Field-effect Transistors

Ion Sensitive Organic Field-Effect Transistors (ISOFETs)... 

Fig. 6.2. Cross section of an ion sensitive organic field-effect transistor (ISOFET) [14], Copyright 2001 IEEE...

Abstract The main methodologies for the synthesis of fused thiophenes (thienothiophenes, dithienothiophenes, and thienoacenes) and some of their oligomers and polymers are described. Such compounds are particularly important in materials chemistry. They have applications in organic light-emitting diodes (OLEDs), organic field effect transistors (OFETs), (dye-sensitized) solar cells, and electrochromic devices (ECDs). 

Our choice for an Ion Sensitive Field Effect Transistor (ISFET) as a transducing element was based on the fact that the SiO surface contains reactive SiOH groups for the covalent attachment of organic molecules and polymers. In addition the FET has fast response times and can be made very small with existing planar IC technology. FIGURE 1... 

Also organic compound like metal phthalocya-nines [xxvi] and electronic conducting polymers [xxvii] are used as gas-sensitive layers in resistive sensors, POSFETs (polymer oxide silicon field-effect transistors), heterojunction diodes (e.g., polyrrole on... 

Niwa D, Homma T, Osaka T (2004) Fabrication of organic monolayer modified ion-sensitive field effect transistors with high chemical durability. Jpn J Appl Phys 43 L105-L107... 

Zayats, M. Lahav, M. Kharitonov, A.B. Willner, I. Imprinting of specific molecular recognition sites in inorganic and organic thin layer membranes associated with ion-sensitive field-effect transistors. Tetrahedron 2002, 58, 815-824. 

The performance of organic semiconductor field-effect transistor has been improved tremendously in the last few years, focusing on increasing the environmental stability and charge carrier mobility of p- and n-type polymers and small molecules. In particular, for polymers the record mobility values reported till date are approaching 2cm (V s ) for p-type polymers [7] and Icm (V s ) for n-type polymers [8]. The p-type conduction has been till last few years much superior than n-type one, due to the oxygen and water sensitivity of many organic anions [9]. Only recentiy, n-type polymers with comparable performance have been reported. 

---