Organic thin film photovoltaic cells based on planar and mixed heterojunctions between fullerene and a low bandgap oligothiophene

Journal article

We present the material α-ω -bis-(dicyanovinylen)-sexithiophen (DCV6T) as donor material in organic solar cells. A systematic study on the potential of DCV6T is given for different active layer concepts. DCV6T is a member of a class of acceptor-substituted oligothiophenes, which showed efficiencies of up to 3.4% and open circuit voltages (Voc) of 1.0 V, which were recently reported [K. Schulze Adv. Mater. (Weinheim, Ger.) 18, 2875 (2006)]. To verify the potential of the material (DCV6T), organic solar cells with planar heterojunctions, bulk heterojunctions, and a hybrid-planar-mixed heterojunction are investigated. The planar heterojunction solar cells of DCV6T and C60 show the highest Voc of 0.90 V. The mixed heterojunction solar cells have improved currents but a lower Voc of 0.82 V. The solar cell using the hybrid-planar-mixed heterojunction achieves the best combination of parameters. It has a Voc of 0.88 V, a short circuit current (jsc) of 5.7±0.4 mA cm-2, a fill factor of 41.6%, and a power conversion efficiency of 2.1±0.2%. © 2009 American Institute of Physics.

Authors: Wynands, D; Männig, B; Riede, M; Leo, K; Brier, E

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: American Institute of Physics
• Journal: Journal of Applied Physics
• Volume: 106
• Issue: 5
• Article number: 054509
• Publication date: 2009-01-01
• DOI: 10.1063/1.3204491
• ISSN: 0021-8979
• Language: English