Dicyanovinyl substituted oligothiophenes: Thermal stability, mobility measurements, and performance in photovoltaic devices

Journal article

A series of dicyanovinyl-oligothiophenes are investigated concerning their thermal stability, absorption in thin film, and hole mobility. Due to very high extinction coefficients, these materials are interesting for application as donor in solar cells. The quinquethiophene DCV₂-5T, which shows a hole mobility of 2.2×10^–5 cm²/Vs, is used as donor material in a flat heterojunction organic small molecule solar cells. Despite a very thin donor layer of only 6 nm, these devices exhibit in a planar heterojunction with 15 nm C₆₀ an efficiency of up to 2.8% with a fill factor of up to 58%, a short circuit current density of 5.2 mA/cm², an open circuit voltage of 1.03 V, and an external quantum efficiency of 30% in the green spectral range. © 2011 Elsevier B.V. All rights reserved.

Authors: Wrackmeyer, MS; Hein, M; Petrich, A; Meiss, J; Hummert, M

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Elsevier
• Journal: Solar Energy Materials and Solar Cells
• Volume: 95
• Issue: 12
• Pages: 3171-3175
• Publication date: 2011-12-01
• DOI: 10.1016/j.solmat.2011.06.022
• ISSN: 0927-0248
• Language: English
• Keywords: Absorption measurement in thin film; Mobility measurement; Thermal stability; DFT calculation; Organic solar cell; Dicyanovinyl