Charge Onsager-Braun theory

Braun [22] extended Onsager s theory to the case that the dissociating e-h pair is the lowest excited state of the system, such as the charge transfer (CT) state in a binary molecular solid, for instance a charge transfer crystal composed by donor-acceptor moieties or a molecular solid doped with either donors or acceptors. The essential new element in Braun s theory is the notion that the e-h pair has a finite lifetime, determined by its nonradiative decay. This implies that an initially optically... 

Braun derived an expression for k E) from the 1934 Onsager theory by use of the expression given by Fuoss and Accascina (1959) and Eigen et al. (1964) for the zero-field equilibrium constant for the dissociation of an ion pair. Assuming a field-independent lifetime, Braun determined the field dependence of the charge-transfer state dissociation probability as... 

A well-established model to describe free charge generation in isotropic media via split-up of Coulombically bound geminate pairs is the Braun-Onsager theory [164] (see also [165] for a detailed discussimi on the accuracy of the model). Carriers are... 

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