- Improved efficiency of CdS quantum dot sensitized solar cell with an organic redox couple and a polymer counter electrode
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Quantum dot sensitized solar cells (QDSSCs) based on an organic thiolate/disulfide redox couple (C7H5N4S-/C14H10N8S2or C2H3N4S-/C4H6N8S2) and a polymer counter electrode [poly (3, 4-ethylenedioxythiophene), PEDOT] were fabricated and their photovoltaic performance were investigated. In CdS QDSSC, the organic C7H5N4S-/C14H10N8S2electrolyte shows better performance than the polysulfide electrolyte, and the PEDOT counter electrode exhibits higher efficiency than that of the Pt counter electrode and the CoS counter electrode. An efficiency of 1.53% was achieved in this QDSSC. The influences of the morphology and the deposition charge of the PEDOT counter electrodes on the cell performance were also studied. Furthermore, it was found that the C7H5N4S-/C14H10N8S2redox couple outperformed the C2H3N4S-/C4H6N8S2redox couple due to reduced electron recombination.
- Shu, Ting,Li, Xiong,Ku, Zhi-Liang,Wang, Shi,Wu, Shi,Jin, Xiao-Hong,Hu, Chun-Di
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p. 700 - 704
(2014/12/11)
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- Efficient dye-sensitized solar cells with potential-tunable organic sulfide mediators and graphene-modified carbon counter electrodes
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A new class of organic sulfide mediators with programmable redox properties is designed via density functional theory calculations and synthesized for efficient dye-sensitized solar cells (DSCs). Photophysical and electrochemical properties of these mediators derived from systematical functionalization of the framework with electron donating and withdrawing groups (MeO, Me, H, Cl, CF3, and NO2) are investigated. With this new class of organic mediators, the redox potential can be fine-tuned over a 170 mV range, overlapping the conventional I-/I3-couple. Due to the suitable interplay of physical properties and electrochemical characteristics of the mediator involving electron-donating MeO group, the DSCs based on this mediator behave excellently in various kinetic processes such as dye regeneration, electron recombination, and mass transport. Thus, the MeO derivative of the mediator is identified as having the best performance of this series of redox shuttles. As inferred from electrochemical impedance spectroscopy and cyclic voltammetry measurements, the addition of graphene into the normal carbon counter electrode material dramatically improves the apparent catalytic activity of the counter electrode towards the MeO derivative of mediator, resulting in N719 based DSCs showing a promising conversion efficiency of 6.53% under 100 mW·cm-2 simulated sunlight illumination. Copyright
- Li, Xiong,Liu, Linfeng,Liu, Guanghui,Rong, Yaoguang,Yang, Ying,Wang, Heng,Ku, Zhiliang,Xu, Mi,Zhong, Cheng,Han, Hongwei
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p. 3344 - 3352
(2013/07/26)
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- NOVEL METHOD FOR PREPARING ROSUVASTATIN, INTERMEDIATE COMPOUNDS USEFUL FOR PREPARING SAME, AND METHOD FOR PREPARING SAME
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The present invention relates to novel intermediate compounds used in preparing Rosuvastatin or the pharmaceutically acceptable salts thereof, to a method for preparing same, and to a method for preparing Rosuvastatin or the pharmaceutically acceptable salts thereof from the intermediates. The preparation method of the present invention has the effect of providing Rosuvastatin hemi-calcium salts with an excellent yield rate.
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Page/Page column 14
(2012/04/23)
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- NOVEL METHOD FOR PREPARING ROSUVASTATIN, INTERMEDIATE COMPOUNDS USEFUL FOR PREPARING SAME, AND METHOD FOR PREPARING SAME
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The present invention relates to novel intermediate compounds used in preparing Rosuvastatin or the pharmaceutically acceptable salts thereof, to a method for preparing same, and to a method for preparing Rosuvastatin or the pharmaceutically acceptable salts thereof from the intermediates. The preparation method of the present invention has the effect of providing Rosuvastatin hemi-calcium salts with an excellent yield rate.
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Page/Page column 9
(2012/06/16)
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