2020 Volume 89 Issue 1 Pages 6-12
In organic materials, the initial charge separation occurs between molecules and the photo-generated electron-hole pairs are bound by a Coulombic interaction. After charge separation, the separated electron-hole pairs will recombine or ultimately separate by diffusion. An important length scale is the Onsager length where the thermal energy of diffusion becomes comparable to the Coulombic interaction. We present recent theoretical attempts to reveal charge generation and charge recombination processes in organic materials. The results could be helpful to quantify loss processes in organic electronic devices.