Tris rare earth triple-decker

Langmuir-Blodgett (LB) technique has been also used for the preparation of Pc-based OFET, as it allows the fine control of both the structure and the thickness of the film at the molecular level [226,227], OFET devices based on amphiphilic tris(phthalocyaninato) rare earth, triple-decker complexes have been prepared by LB technique, showing good OFET performances [228], More recently, ambipolar transport has also been realized in OFET devices through a combination of holeconducting CuPc and n-conducting Cgo fullerene, in which the asymmetry of the... 

Sandwich Tris(Phthalocyaninato) Rare Earth Triple-Decker Semiconductors. 298... 

Fig. 6 Molecular structures of sandwich tri(phthalocyaninato) rare earth triple-decker complexes used as semiconductors of p-type OFET...

Table 3 Performance of some tris(phthalocyaninato) rare earth triple-decker complexes-based p-type OFET devices (mEn means m x 10n)... 

Most devices based on Pc are fabricated by vacuum deposition, i.e. thermal evaporation. However, recent solution-based Langmuir-Blodgett (LB) techniques have also been used. LB-films of 25h-251 gave poor (10 cm V s for 25j) to moderate (1.7 x 10 cm V s for 251) mobilities (Figure 3.1.9).[162-164] More recently, high mobilities of 0.24-0.60 cm V s have been observed for LB films of amphiphilic tris(phthalocyaninato) rare earth triple-decker complexes, 25m-25o.[165] OFET characteristics have also been reported for porphyrin derivatives, 25p-q with mobilities of 2.2 x 10 cm V s and 0.012 cm V s, respec-tively.[166-168] LB-prepared thin films of Cyclo[8]pyrrole (25r), an extended porphyrin-like molecule, also exhibited a high mobility of 0.68 cm V s, but with a low on/off ratio.[169]... 

Fine control of crystal structures in the thin film is crucial to improve the performance of OFETs. Nevertheless, extensive efforts have been put into controlling Pcs and related compounds using an LB technique or dis-cotic liquid crystals, and the mobilities are usually in the range of 10 to 10 cm /Vs [120]. A recent report on OFETs based on rare-earth metal triple-decker complexes of amphiphilic tris(Pcs) shows remarkably high mobilities of 0.24-0.60 cm /Vs, as shown in Fig. 31 [121]. 

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