50668-21-8Relevant articles and documents
Alkyl-functionalized organic dyes for efficient molecular photovoltaics
Koumura, Nagatoshi,Wang, Zhong-Sheng,Mori, Shogo,Miyashita, Masanori,Suzuki, Eiji,Hara, Kohjiro
, p. 14256 - 14257 (2006)
We designed and synthesized new alkyl-functionalized organic dyes, MK-1 and MK-2, for dye-sensitized solar cells (DSSCs). Based on the MK-2 dye, a high performance of efficiency (η, 7.7%; short-circuit current density Jsc = 14.0 mA cm-2, open-circuit voltage Voc = 0.74 V, and fill factor FF = 0.74) was achieved under AM 1.5 G irradiation (100 mW cm-2). Remarkably, the relatively higher Voc for DSSCs based on MK-1 and MK-2 dyes, which have long alkyl chains, were observed among the organic dyes caused by the increasing of the electron lifetime in the conduction band of TiO2. Our molecular design of alkyl-functionalized dyes strongly suggests the promising performance of molecular photovoltaics based on organic dyes. Copyright
The effect of porphyrins suspended with different electronegative moieties on the photovoltaic performance of monolithic porphyrin-sensitized solar cells with carbon counter electrodes
Chen, Jiangzhao,Ko, Songguk,Liu, Linfeng,Sheng, Yusong,Han, Hongwei,Li, Xiong
, p. 2889 - 2900 (2015/04/22)
Three D-π-A porphyrin sensitizers with different electronegative moieties (2,4,6-triphenyl-1,3,5-triazine, carbazole and triphenylamine) attached at the meso-position were designed and synthesized for monolithic dye-sensitized solar cells based on mesoscopic carbon counter electrodes. The effects of these different electronegative moieties on the photophysical, electrochemical and accordingly photovoltaic performance of the corresponding devices were investigated systematically. Electrochemical measurements indicate that the HOMO and LUMO energy levels could be tuned through the introduction of different electronegative groups onto the backbone of D-π-A porphyrin molecules. Current-voltage characteristics indicate that the Jsc and Voc of the DSSCs based on WH-C3, WH-C4 and WH-C5 increase as the electron-donating ability of their donors enhance in the order of WH-C3 sc) of 11.43 mA cm-2, an open circuit voltage (Voc) of 633.84 mV, and a fill factor (FF) of 0.69, corresponding to an overall conversion efficiency (η) of 5.00%.
Well defined carbazol-3,9-diyl based oligomers as host materials for organic electro-phosphorescent devices
Grigalevicius, Saulius,Grazulevicius, Juozas V.,Tsai, Ming-Han,Wu, Chung-Chih
, p. 77 - 86 (2008/03/13)
Well defined carbazol-3,9-diyl-based derivatives as host materials for electro-phosphorescent devices have been synthesized by the modified Ullmann reaction as a key step. The full characterization of their structure by mass spectrometry, infrared absorption and proton magnetic resonance spectroscopy is presented. The amorphous compounds with glass transition temperatures of 103-154C possess high thermal stability with onset decomposition temperatures exceeding 360C. Conjugation of the 3,9-linked systems is rather confined within one carbazole unit, retaining large triplet energies suitable for green and red electro-phosphorescence. Using the new host material, efficient green phosphorescent organic light emitting diodes was demonstrated.
