Dresden 2009 – scientific programme
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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices
SYOP 4: Organic Photovoltaics: from Single Molecules to Devices
SYOP 4.28: Poster
Thursday, March 26, 2009, 16:30–19:00, P1A
Organic p-n heterostructures and superlattices — •Stefan Kowarik1, Alexander Hinderhofer2, Alexander Gerlach2, Oriol Osso3, Cheng Wang4, Alexander Hexemer4, and Frank Schreiber2 — 1Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA — 2Institut für Angewandte Physik, Auf der Morgenstelle 10, 72076 Tübingen, Germany — 3MATGAS 2000 A.I.E., Esfera UAB, 08193 Bellaterra, Barcelona, Spain — 4Advanced Light Source, 1 Cyclotron Road, Berkeley, CA 94720, USA
For many applications of organic semiconductors two components such as e.g. n and p-type layers are required, and the morphology of such heterostructures is crucial for their performance. Pentacene (PEN) is one of the most promising p-type molecular semiconductors and recently perfluoro-pentacene (PFP) has been identified as a good electron conducting material for complementary circuits with PEN. We use soft and hard x-ray reflectivity measurements, scanning transmission x-ray microscopy (STXM) and atomic force microscopy for structural investigations of PFP-PEN heterostructures. The chemical contrast between PEN and PFP in STXM allows us to determine the lateral length scales of p and n domains in a bilayer. For a superlattice of alternating PFP and PEN layers grown by organic molecular beam deposition, X-ray reflectivity measurents demonstrate good structural order. We find a superlattice reflection that varies strongly when tuning the X-ray energy around the fluorine edge, demonstrating that there are indeed alternating PFP and PEN layers.