Ultrafast charge transfer

Wynne K, Galli C and Hochstrasser R M 1994 Ultrafast charge transfer in an electron donor-acceptor complex J. Cham. Phys. 100 4796-810... 

Kollmannsberger M, Rurack K, Resch-Genger U, Daub J (1998) Ultrafast charge transfer in amino-substituted boron dipyrromethene dyes and its inhibition by cation com-plexation a new design concept for highly sensitive fluorescent probes. J Phys Chem A 102 10211-10220... 

Ultrafast radiationless transitions are often observed through ultrashort pump-probe time-resolved measurements. In this section, a theoretical formula of the pump-probe time-resolved stimulated emission spectra is briefly introduced and the relationship between the dynamics calculation and the pump-probe spectra are presented. For this purpose, the dynamics of a simple model system with vibrationally non-equilibrated is discussed. For a real application of the theoretical treatment given in this chapter, ultrafast charge transfer taking place in photosynthetic RCs is studied. 

Mataga N, Chosrowjan H,Taniguchi S. Ultrafast charge transfer in excited electronic states and investigations into fundamental problems of exciplex chemistry Our early studies and recent developments. J Photochem Photobiol C Photochem Rev 2005 6 37-79. 

Shibamoto K, Katayama K, Sawada T (2007) Ultrafast charge transfer in surface-enhanced Raman scattering (SERS) processes using transient reflecting grating (TRG) spectroscopy. Chem Phys Lett 433 385-389... 

The ultrafast charge transfer process was subsequently time resolved [175,176] the data directly confirm that charge transfer occurs within a few hundred femtoseconds. Since the charge transfer rate is more than two orders of magnitude faster than competing radiative and non-radiative recombination processes, the quantum efficiency for charge transfer must be close to unity. 

Fig. n.16 The scheme of photoinduced charge transfer (above electron transfer below hole transfer). Three important steps are (I) the absorption of radiation by the charge donor (ii) the generation of an exciton, and (Hi) the ultrafast charge transfer (into the LUMO of the electron acceptor or the HOMO of the hole acceptor, with formation of a positive radical ion at the charge donor) on a sub-picosecond time scaie. From [21]. 

Thomsen, C. L., Thogersen, J., Keiding, S. R. [1998]. Ultrafast Charge-Transfer Dynamics Studies of P-Nitroaniline in Water and Dioxane,/ Phys. Chem. A. 102,1062-1067. 

These materials display stable micromorphology (Figure 1.40) and do not undergo macroscopic phase separation upon annealing. Besides, they also display PL quenching, that indicate efficient and ultrafast charge transfer (rapid excitons breakup), thereby demonstrating their potential... 

Morishita T., Hibara A., Sawada T., Tsuyumoto 1. Ultrafast charge transfer at Ti02/SCN (aq) interfaces investigated by femtosecond transient reflecting grating method. J. Phys. Chem. B 1999 103 5984-5987... 

These results imply that a large fraction of the initial photoexcitations undergo ultrafast charge transfer (within 1 picosecond) in MEH-PPV/C60 (1%) in contrast to BCHA-PPV/C60 (1%) where charge transfer is somewhat slower [56]. 

The field of bulk heterojunction (BHJ) solar cells was created as a result of the demonstration of ultrafast charge transfer. Ultrafast observations of pho-toinduced infrared active vibrational modes (IRAV) associated with polaron formation unambiguously established the ultrafast photogeneration of eharge carriers in BHJ materials. ... 

Schrodinger equation that describes the nanostructured organic photovoltaic blend. Thus, there is an immediate probability amplitude for finding a photoexcitation near a heterojunction boundary, thereby enabling ultrafast charge transfer (in the femtosecond regime) over relatively long distances. 

The data in Figure 8.4 can be used to determine more precisely the ratio between the ultrafast charge transfer component and the charge transfer... 

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