Full Dynamics Description of Mg Phthalocyanine Crystalline and Amorphous Semiconductor Systems

Abstract

Based on visible and mid-infrared transient absorption studies, probing the inter-and intraband dynamics, respectively, of magnesium phthalocyanine (MgPc) organic semiconductors, we were able to develop a model to describe the dynamics and the resulting optical response. We demonstrate how the model could offer insights into the dynamics of more complicated systems such as amorphous MgPc samples obtained by established preparation methods. In particular, we show a clear dimensionality difference of the exciton dissipation mechanism between crystalline and amorphous MgPc, which we resolve in the intraband dynamics, and how this result can also be deduced from the interband dynamics through the implementation of the developed model.

Coherent ring-current migration of Mg-phthalocyanine probed by time-resolved X-ray circular dichroism

“…1), which remains stable during the electronic dynamics. 42,43 MgPc has a high density of states belonging to the E u irreducible representation (Table S1 †), which facilitates the coherent excitation of many excited states. The molecule has multiple rings, including a central ring and the four benzene rings in the corners, which makes it possible to observe the dynamics of both local and global ring currents.…”