Semiconducting organic thin films, electrical

Electrical Switching and Memory Phenomena in Semiconducting Organic Thin Films... 

The ability of nanocrystals to fuse at relatively modest temperatures provides a low-temperature route to thin-film growth. This approach has been successfully used for formation of metallic (Au,53 Ag54) and semiconducting (CdS,52 CdSe,55 HgTe56) thin films with good electrical conductivity. However, a serious limitation of this approach is associated with the presence of organic... 

Figure 29. For the latter case, it is considered that the semiconducting re-electron systems are separated by insulating hydrocarbon spacers, resulting in alternate thin layers of organic semiconductor and insulator in these monolayer assemblies. The direct current - voltage (I - V) characteristics were mea- sured for the multilayers H2Pc(R)8 and Cu-Pc(R)8 in directions perpendicular and parallel to the film plane. In both cases, the linear I - V relationships of Ohm s law were observed at low electric field and obtained DC conductivities are summarized in Table 3. The normal conductivity (ajJ were ca. 10 13 S cm-1, while the lateral ones p//) were 3.4 x 10-7 and 9.9 x 10 7 S cm 1 for films of the metal-free and copper Pc derivatives, respectively. The former (ojJ tended to decrease slightly with increase of Figure 29. Schematical illustration of the substituent alkyl chain length,...

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