Organic dyes containing fluoreneamine donor and carbazole π-linker for dye-sensitized solar cells
摘要:
A series of new organic dyes containing fluoreneamine-based donor and carbazole pi-spacer are reported. These dyes displayed longer wavelength charge transfer absorption when compared to that of the corresponding phenylamine analogs. Fluoreneamine-based donors shifted the lowest unoccupied molecular orbital upwardly which is beneficial for the injection of electrons from the excited dye into the conduction band of TiO2 and lowered the oxidation potential of the dyes. The electronic perturbations caused by the fluorene unit have been confirmed by the density functional theoretical calculations. A device fabricated using a dye featuring difluorenylaminocarbazole donor and thiophene in the pi-spacer exhibited promising power conversion efficiency (6.4%). The interfacial electron transfer kinetics has been elucidated by electrochemical impedance spectroscopy which showed the beneficial role of difluorenylamine unit in suppressing the electron recombination. (C) 2015 Elsevier Ltd. All rights reserved.
Organic dyes containing fluoreneamine donor and carbazole π-linker for dye-sensitized solar cells
摘要:
A series of new organic dyes containing fluoreneamine-based donor and carbazole pi-spacer are reported. These dyes displayed longer wavelength charge transfer absorption when compared to that of the corresponding phenylamine analogs. Fluoreneamine-based donors shifted the lowest unoccupied molecular orbital upwardly which is beneficial for the injection of electrons from the excited dye into the conduction band of TiO2 and lowered the oxidation potential of the dyes. The electronic perturbations caused by the fluorene unit have been confirmed by the density functional theoretical calculations. A device fabricated using a dye featuring difluorenylaminocarbazole donor and thiophene in the pi-spacer exhibited promising power conversion efficiency (6.4%). The interfacial electron transfer kinetics has been elucidated by electrochemical impedance spectroscopy which showed the beneficial role of difluorenylamine unit in suppressing the electron recombination. (C) 2015 Elsevier Ltd. All rights reserved.
Dipolar Compounds Containing Fluorene and a Heteroaromatic Ring as the Conjugating Bridge for High-Performance Dye-Sensitized Solar Cells
作者:Chih-Hsin Chen、Ying-Chan Hsu、Hsien-Hsin Chou、K. R. Justin Thomas、Jiann T. Lin、Chao-Ping Hsu
DOI:10.1002/chem.200903151
日期:2010.3.8
A novel series of dipolar organic dyes containing diarylamine as the electron donor, 2‐cyanoacrylic acid as the electron acceptor, and fluorene and a heteroaromaticring as the conjugatingbridge have been developed and characterized. These metal‐free dyes exhibited very high molar extinction coefficients in the electronic absorption spectra and have been successfully fabricated as efficient nanocrystalline
Synthesis, optical, electrochemical and photovoltaic properties of organic dyes containing trifluorenylamine donors
作者:Abhishek Baheti、Satyanarayana Reddy Gajjela、Palani Balaya、K.R. Justin Thomas
DOI:10.1016/j.dyepig.2014.07.036
日期:2015.2
loading data, incident photon to current conversion efficiency and the interfacial kinetic parameters estimated from the intensity modulated photovoltage/photocurrent spectral measurements. A dye with fluorene and bithiophene segments in the π-linker exhibited device efficiency up to 5.8%. The enhanced power conversion efficiency exhibited by this dye when compared to its analogue containing diphenylaminofluorne