DOI: https://doi.org/10.29363/nanoge.aohm.2019.012
Publication date: 8th January 2019
The process on what controls the photogeneration of free charges in organic donor-acceptor films is still not well understood. In this presentation I shall show that the primary step of electron transfer from a photoexcited donor to the acceptor in an organic donor-acceptor type film is not suitable described by Marcus theory, an in particular independent of the driving force.[1] In contrast, the subsequent step of dissociating the thus-formed charge-transfer (CT) state strongly depends on energetics, and is assisted by delocalization. Further, I shall show that a description of the absorption and emission spectra of CT states is not consistent with both Marcus’ electron transfer theory and the original Marcus-Levich-Jortner (MLJ) theory. Instead, the inclusion of disorder effects is crucial for a suitable and consistent description[2]. Both, PL and EQE spectra of CT states can be rationalized in terms of the classic Franck-Condon picture of electronic transitions that couple to intra-molecular vibrations as well as low frequency modes of the donor-acceptor pair that forms the CT state.
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