The charge-transfer (CT) states formed at the donor-acceptor interfaces, mediate exciton dissociation, charge generation, and charge recombination processes in organic electronic devices. Here, we assess the current understanding of CT states and describe how factors such as electronic coupling, electronic polarization, interface geometry, static and dynamic disorders affect their nature and influence the radiative and non-radiative processes. New features of the CT states, which emerged from the recent development of organic solar cells and organic light emitting diodes will be also discussed.
