Charge separation nanoparticle-polymer

Photophysics of Charge Separation Nanoparticle-Polymer Systems... 

Hybrid systems based on these different class of materials reveal interesting electronic and optical properties and add further insight into the individual characteristics of the different components. The photovoltaic properties rely on efficient charge separation upon photoexcitation. Pristine polymers have a problem with large amounts of disorder and low mobilities, in spite of large absorption. Many of the properties of polymer systems will be examined with three different varieties of nanoparticles ... 

Figure 11.2 Scheme for efficient charge separation in a nanoparticle-polymer composite (adapted from [13]) (a) absorption in the polymer is followed by an electron transfer process to the nanoparticle (electron acceptor), (b) absorption in the polymer is followed by an exciton transfer process to the nanoparticle, followed by the hole transfer to the polymer (c) absorption in the nanoparticle is followed by hole transfer to the polymer [23]... 

Figure 7.15. Interaction forces measured on separation for two glass spheres in 1 mM KCl in the presence of 3 ppm highly charged AM-MAPTAC cationic polymer (squares) and 3 ppm highly charged AM-MAPTAC together with silica nanoparticles (triangles) AM-MAPTAC, copolymer of acrylamide and (3-meth acrylamido propyl)tri methylammonium chloride. (From ref. (16) with permission)...

The mechanisms for charge generation and separation upon optical excitation and light emission are different for the spherical nanoparticles and essentially linear chain polymers. 

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