標題: Reversed Y-shape di-anchoring sensitizers for dye sensitized solar cells based on benzimidazole core
作者: Desta, Mulu Berhe
Chaurasia, Sumit
Lin, Jiann T.
應用化學系
Department of Applied Chemistry
關鍵字: Benzimidazole;Di-anchoring;Metal-free sensitizers;Dye-sensitized solar cells
公開日期: 1-五月-2017
摘要: Three new Y-shaped D-(pi-A)(2) di-anchoring organic dyes comprising an arylamine as the electron donor, 2-cyanoacrylic acid as electron acceptors and various 2,4,7-trisubstituted benzimidazole entity as theirlinkers/spacers, have been synthesized for dye-sensitized solar cells. The new dyes MD2 and MD3 show red-shifted absorption in solution spectra when compared with their congeners (8b and 9b) without electron-donating hexyloxy substituents. The N-alkyl at the benzimidazble, though helps with improved solubility, apparently results in serious twist between the benzimidazole core and the neighboring thienyl rings in the conjugated segment connected to the acceptor facing the N-alkyl or the phenyl ring connected to the arylamine donor. Photophysical and electrochemical measurements as well as theoretical computations were carried out on the new dyes. In addition to current voltage scan and incident photon to electron conversion efficiency (IPCE), electrochemical impedance spectroscopic (EIS) studies were also conducted. The dye MD3 exhibited the highest light-to-electric energy conversion efficiencies of 6.45% and 6.69%, respectively, for DSSCs without and with CDCA co-adsorbent. Better cell performance of MD3 than 9b can be attributed to better light harvesting and better dark current suppression of the former. (C) 2017 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.dyepig.2017.01.068
http://hdl.handle.net/11536/144031
ISSN: 0143-7208
DOI: 10.1016/j.dyepig.2017.01.068
期刊: DYES AND PIGMENTS
Volume: 140
起始頁: 441
結束頁: 451
顯示於類別:期刊論文