Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 19: Poster Session 1 (joint session with BP)
CPP 19.44: Poster
Dienstag, 1. April 2014, 09:30–13:00, P1
The influence of co-evaporated polydimethylsiloxane oil on small molecule bulk heterojunction solar cells — •Felix Holzmueller1, Lutz Wilde2, Christian Koerner1, and Karl Leo1 — 1Institut für Angewandte Photophysik, Technische Universität Dresden, 01069 Dresden, Germany — 2Fraunhofer Institute for Photonic Microsystems, 01069 Dresden, Germany
For efficient organic solar cells (OSC), the morphology of donor-acceptor (DA) heterojunctions is of great importance. It can be influenced by methods like post-annealing or substrate heating during the evaporation. Furthermore Kaji et al. recently proposed a new method called "co-evaporant induced crystallization"[1]. An additive is co-evaporated during the vacuum deposition of the donor and acceptor materials. At the same time, the substrate is heated to a certain temperature to ensure that the incoming additive molecules desorb from the substrate surface after their arrival. A vapor of additive molecules forms above the substrate surface and supports the crystallization of the bulk phases. In this contribution we use this method to test the influence of co-evaporated polydimethylsiloxanes on different DA-combinations like e.g. zinc-phthalocyanine (ZnPc) and C60. Grazing incidence X-Ray diffraction and X-ray reflection measurements are performed on co-evaporated bulk layers showing a significant increase of crystallinity for the C60 phase in ZnPc:C60 blends. Additionally, the influence of the co-evaporation method on the device efficiency is investigated. [1] Kaji, T. et al. (2011). Adv. Mater., 23, 3320