Dresden 2011 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 13: Organic Electronics and Photovoltaics CPP-I (jointly with CPP, HL, and O)
DS 13.2: Vortrag
Montag, 14. März 2011, 14:30–14:45, ZEU 222
Highly efficient vacuum processed BHJ solar cell based on merocyanines — •Vera Steinmann1, Hannah Bürckstümmer2, Nils M. Kronenberg1, Martin R. Lenze1, Dirk Hertel1, Frank Würthner2, and Klaus Meerholz1 — 1Department für Chemie, Universität Köln, Germany — 2Institut für Organische Chemie and Röntgen Research Center for Complex Material Systems Universität Würzburg, Germany
Bulk heterojunction (BHJ) organic solar cells have attracted considerable interest due to their potential for large-scale, cost-effective and environmentally friendly power generation. Small molecules have been successfully introduced in solution- (SOL) as well as vacuum- (VAC) processed devices, reporting efficiencies (PCE) up to 4.4% and 5.7% respectively. For simple layer stack devices (2-3 layers) based on CuPc as electron donor and C60 as electron acceptor PCEs up to 5.0% have been achieved.
Recently, we presented a direct comparison of highly efficient SOL and VAC BHJ cells based on merocyanine dyes (MC) with a similarly simple layer stack as reported in the literature. Our most efficient devices exhibited PCEs up to 4.9%. Further optimizations on the VAC processed cells led to high PCEs exceeding 6% while keeping the same simple layer stack. In addition, these cells have demonstrated exceptional performance even at lower light intensities.
Due to the simple chemical variability of MC dyes, they are ideally suited for tandem solar cells. We will present first attempts in this direction.