Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 6: Poster: Structural Ordering and Electronic Transport (joint focus with HL)
CPP 6.24: Poster
Montag, 26. März 2012, 17:30–19:30, Poster A
Towards Highly Efficient Vacuum-processed Merocyanine Tandem Solar Cells — •Vera Steinmann1, Nils Kronenberg1, Hannah Bürckstümmer2, Dirk Hertel1, Martin Lenze1, Steven Graf1, Frank Würthner2, and Klaus Meerholz1 — 1Department für Chemie, Universität Köln, Luxemburger Straße 116, 50939 Köln (Germany) — 2Institut für Organische Chemie and Röntgen Research Center for Complex Material Systems, Universität Würzburg, Am Hubland, 97074 Würzburg (Germany)
In the last decade, high demand for low-cost, renewable energy spurred strong developments in the research of organic photovoltaics (OPV). To date, the highest power conversion efficiency (PCE) of 8.4% is reported for polymer solar cells. However, small molecules (SM) have recently gained increased interest, reaching PCEs around 6%. Admittedly, most efficient SM solar cells still require rather sophisticated multilayer device configurations. In the past, we successfully introduced merocyanine (MC) dyes in vacuum-processed (VAC) single solar cells with PCEs up to 4.9%. Further device optimization led to high PCEs beyond 6%, while maintaining a simple device setup. Impressive performances motivated the implementation of MCs in VAC tandem cells. We present a "proof of concept" MC tandem cell, consisting of two identical subcells. A high PCE of 4.7% is obtained, closely approaching the comparable single cell PCE of 5.0%. The optimized open-circuit voltage is as large as 2.1 V. Moreover, we introduce a novel tandem cell configuration, combining a planar- and bulk heterojunction. First MC tandem cells with different subcells are already highly promising.