Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 75: Organic Electronics and Photovoltaics II (Joint session of CPP, DS, HL and O, organized by CPP)
HL 75.10: Vortrag
Donnerstag, 10. März 2016, 12:15–12:30, H40
Influence of the Heterojunction's Interface on the Dynamics of Separated Charges Recombination in Organic Photoactive Materials — •Julien Gorenflot1,2, Niva Alina Ran3, Mike Heiber3, Guillermo Bazan3,4, Thuc-Quyen Nguyen3,4, and Frédéric Laquai1,2 — 1Max Planck Institut für Polymerforschung, Mainz, Germany — 2King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia — 3University of California Santa Barbara, Santa Barbara, California, United States — 4Faculty of Science King Abdulaziz University, Jeddah, Saudi Arabia
A recent study has indicated that the energetic density of shallow trap states, specifically at the interface between the electron donor and the electron acceptor, could be responsible for the apparent high recombination order observed in organic photoactive blends [1]. In order to elucidate this issue, we carried out investigations on a material system that allows for well-controlled donor/acceptor interactions. Films of the small-molecule donor, H1, can be processed such that H1 molecules are either stacking with their pi-face perpendicular or parallel to the substrate. By evaporating a layer of the acceptor molecule C60 on the films, we study the effect of molecular orientation at the donor/acceptor interface on charge recombination using transient absorption spectroscopy. We compare the two bilayer systems to a bulk heterojunction also using H1, which is expected to have a mixture of face-on and edge-on donor/acceptor interactions as well as a much larger interface area. [1] J. Gorenflot et al., J. Appl. Phys.115, 144502 (2014)