Dresden 2026 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 40: Hybrid, Organic and Perovskite Optoelectronics and Photovoltaics IV
CPP 40.1: Vortrag
Mittwoch, 11. März 2026, 17:00–17:15, ZEU/LICH
Morphological Disorder Boosts Charge Separation in Single-Component OPDs — •Michel Panhans1, Jakob Wolansky2,3, Karl Leo2, Johannes Benduhn2,3, and Frank Ortmann1 — 1TUM School of Natural Sciences and Atomistic Modeling Center, Munich Data Science Institute, Technische Universität München, 85748 Garching b. München, Germany — 2Dresden Integrated Center for Applied Physics and Photonic Materials, Technische Universität Dresden, 01069 Dresden, Germany — 3DZA, Görlitz, Germany
Single-component organic photodetectors (OPDs) provide a simplified alternative to donor-acceptor heterojunctions, yet their operation mechanisms remain theoretically underexplored. We investigate the molecular origin of charge generation in vapor-deposited DCV2-5T by modeling the excitonic density of states with an effective exciton Hamiltonian that incorporates electronic coupling, Coulomb interaction, and structural disorder. Disorder is introduced through lateral shifts between π-stacked molecules, which notably modulates electronic and excitonic couplings. Simulations show that intermediate disorder reproduces the experimental external quantum efficiency, while strong disorder enhances hybridization between excitonic states. This hybridization enables exciton delocalization via a superexchange-like mechanism, increasing the probability of charge separation. Counterintuitively, disordered domains exhibit stronger coupling than crystalline ones, suggesting that reduced structural order can facilitate charge generation. These insights highlight morphology-dependent excitonic interactions as a design principle for self-driven OPDs.
Keywords: Organic photodetectors; External quantum efficiency; Exciton absorption; Theoretical modeling