Fluorine-containing low-energy-gap organic dyes with low voltage losses for organic solar cells
2016; Elsevier BV; Volume: 222; Linguagem: Inglês
10.1016/j.synthmet.2016.10.025
ISSN1879-3290
AutoresLijia Fang, Felix Holzmueller, Tomas Matulaitis, Anne Baasner, Christoph Hauenstein, Johannes Benduhn, Martin Schwarze, Annette Petrich, Fortunato Piersimoni, Reinhard Scholz, Olaf Zeika, Christian Koerner, Dieter Neher, Koen Vandewal, Karl Leo,
Tópico(s)Conducting polymers and applications
ResumoFluorine-containing donor molecules TFTF, CNTF and PRTF are designed and isomer selectively synthesized for application in vacuum-deposited organic solar cells. These molecules comprise a donor-acceptor molecular architecture incorporating thiophene and benzothiadiazole derivatives as the electron-donating and electron-withdrawing moieties, respectively. As opposed to previously reported materials from this class, PRTF can be purified by vacuum sublimation at moderate to high yields because of its higher volatility and better stabilization due to a stronger intramolecular hydrogen bond, as compared to TFTF and CNTF. The UV-vis absorption spectra of the three donors show an intense broadband absorption between 500 nm and 800 nm with similar positions of their frontier energy levels. The photophysical properties of the three donor molecules are thoroughly tested and optimized in bulk heterojunction solar cells with C60 as acceptor. PRTF shows the best performance, yielding power conversion efficiencies of up to 3.8%. Moreover, the voltage loss for the PRTF device due to the non-radiative recombination of free charge carriers is exceptionally low (0.26 V) as compared to typical values for organic solar cells (>0.34 V).
Referência(s)