Dresden 2017 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 44: Postersession II
DS 44.32: Poster
Donnerstag, 23. März 2017, 17:00–19:00, P1C
Development of a new method to probe the electronic structure of organic photovoltaic materials in a bulk heterojunction — •Vincent Lami1,2, Paul E. Hopkinson1,2, and Yana Vaynzof1,2 — 1Kirchhoff Institute for Physics, Heidelberg University, Germany — 2Centre for Advanced Materials, Heidelberg University, Germany
Organic photovoltaic (OPV) cells have attracted remarkable interest as a possible alternative to conventional inorganic technologies. The performance of an OPV device is largely determined by the alignment of the electronic energy levels of its individual components. Despite the importance of energetics, the understanding of the energy level evolution within the device is still limited. Consequently, energy level diagrams of OPVs are typically constructed by measuring the energy levels of the individual materials, without taking into account the interactions between them. Herein, we demonstrate the development of a new experimental technique based on ultra-violet photoemission spectroscopy that allows us to measure the progression of both the energy levels and material composition within the photovoltaic active layer. Our preliminary results obtained on a variety of organic materials are very promising and demonstrate the effectiveness of our new technique.