Energy levels, initial charge-separated

In order to match the energy levels of the initial charge-separated species in 1 and the reference triad, and therefore to have the same thermodynamics for charge recombination from this intermediate, it was necessary to consider the electrochemical potential of the process in equation 4. 

Fig. 1.35. Schematic diagram describing energy levels of singlet (So, Si), triplet (Ti, Tn), and charge-separated (CS) states of OPVn-C6o dyads. The energy transfer (A et) and indirect (fc s) and direct (k s) charge separation reactions are indicated with curved dotted arrows. The solid arrow describes the initial excitation of the OPVn moiety. Other symbols are kr and k[ for the radiative rate constants, knr and k m for the non-radiative decay constants, fcjcs and k ics for the intersystem crossing rate constants, and fcx and fcxX for the rate constants for triplet-energy transfer, in each case for OPVn and MP-Ceo, respectively...

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