Organic devices electronics

In the last section, electron transfer between dendrimers in films was mentioned. This type of hopping is important in thin-film organic devices (see above). How do dendrimers behave in solution Are the paradigms the same Actually, they are not. 

Figure 17 shows an energetic scheme for the electron transfer processes taking place at the dye-sensitized heterojunction of such a device. Electron injection from the sensitizer s excited state into the conduction band of Ti02 is followed by regeneration of the dye by hole injection into the hole transport material (HTM). Conduction-band electrons in the metal oxide, as well as holes in the organic medium, are then transported by electronic conduction to the anode and the cathode, respectively. Pulsed picosecond laser photolysis has shown that the hole injection from the oxidized dye sensitizer [Ru (dcbpy)2(NCS)2]" into the spiro-MeOTAD... 

There are many valid approaches to the preparation and study of manmade systems which mimic some aspects of natural photosynthesis. In this article, we shall focus on our results with one of these the synthesis and spectroscopy of multicomponent molecular devices constructed from organic pigments, electron donors, and acceptors whose structures resemble those found in the natural system. In these artificial photosynthetic species, the organizational constraints imposed by the protein environment in natural photosynthesis are provided instead by covalent linkages. 

Jabbour GE, Kippelen B, Armstrong NR, Peyghambarian N (1998) Aluminum based cathode structure of enhanced electron injection in electroluminescent organic devices. Appl Phys Lett 73 1185... 

---