Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 223, Issue 1, Pages 57-64Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2011.08.001
Keywords
Organic DSSC; Carbazole donor; Carbazole linker; Photochemically stable organic sensitizer
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Three metal-free organic sensitizers consisting of carbazole as an electron donor, carbazole or bithiophene as the linker and cyanoacrylic acid as the electron acceptor and anchoring groups were designed and synthesized for use in dye-sensitized solar cells (DSSCs). The sensitizers were characterized by H-1 and C-13 NMR, MALDI-TOF (or HRMS), UV-Vis, photoluminescence, and electrochemistry. The HOMO and LUMO electron distributions of the sensitizers were calculated using density functional theory on a B3LYP level for geometry optimization. The photovoltaic performance of the sensitizers in operational liquid junction-based DSSCs under AM 1.5 G one-sun excitation (100 mW/cm(2)) indicate that the sensitizers are promising candidates for use in DSSCs. Sensitizers 1 and 2 produce a power conversion efficiency of 2.70% with a maximum IPCE of 75% at 450 nm, while sensitizer 3 has a power conversion efficiency of 2.23% with a maximum IPCE of 66% at 440 nm. The sensitizers thus exhibit excellent photon-to-current conversion efficiencies in the blue region of the spectrum and serve as candidates for further strategic optimization in tandem cells. (C) 2011 Elsevier B.V. All rights reserved.
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