期刊
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
卷 145, 期 -, 页码 531-539出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2015.03.032
关键词
DSSCs; Malonic acid; Binding strength; Planar nature; Electron lifetime
类别
资金
- SERI-DST, New Delhi [DST/TM/SERI/2k12/109(C)]
- DST-FIST, New Delhi [SR/FT/CSI-190/2008]
- MHRD, New Delhi
Two new bi-anchoring organic sensitizers of type D-(pi-A)(2) comprising the identical pi-spacer (thiophene-2-acetonitrile) and electron acceptor (malonic acid) but different aryl amine as electron donors (diphenylamine and carbazole) were synthesized, characterized and fabricated metal free dye-sensitized solar cell devices. The intra molecular charge transfer property and electrochemical property of these dyes were investigated by molecular absorption, emission, cyclic voltammetric experiments and in addition, quantum chemical calculation studies were performed to provide sufficient driving force for the electron injection into the conduction band of TiO2 which leads to efficient charge collection. Among the fabricated devices, carbazole based device exhibits high current conversion efficiency (eta = 4.7%) with a short circuit current density (J(SC)) 15.3 mA/cm(2), an open circuit photo voltage (V-OC) of 0.59 V and a fill factor of 0.44 under AM 1.5 illumination (85 mW/cm(2)) compared to diphenylamine based device. (C) 2015 Elsevier B.V. All rights reserved.
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