Trans-disubstituted benzodiazaporphyrin: A promising hybrid dye between porphyrin and phthalocyanine for application in dye-sensitized solar cellsстатья
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Дата последнего поиска статьи во внешних источниках: 24 октября 2016 г.
Аннотация:We have synthesized a zinc benzodiazaporphyrin trans-substituted by a di-(3,5-tert-butyl)phenyl and 4 phenyl carboxylic acid groups (coded CROSSDAP). This new dye has been characterized by UV-vis absorption and emission spectroscopy, electrochemical measurements and modeled using TD-DFT calculations. CROSSDAP exhibits interesting absorption properties Which resemble those of a zinc phthalocyanine; that is an intense Q-band localized at 685 nm. CROSSDAP was used as sensitizer on nanocrystalline TiO2 based Dye-Sensitized Solar Cells with iodide/triiodide electrolyte. The solar cell reaches a 3.37% power conversion efficiency under AM1.5 with an IPCE value over 40% at 680 nm. CROSSDAP can axially bind an imidazole ligand substituted with a Bodipy dye. When used as additive in the electrolyte, the latter antenna amplifies the light harvesting efficiency of CROSSDAP in the 450550 nm range, a feature which increases the photocurrent up to 8.40 mA/cm(2) resulting in a PCE of 3.82%. Overall, these results demonstrate that trans-substituted benzodiazaporphyrins are attractive new dyes for DSSC, particularly towards the development of efficient sensitizers to harvest the low energy part of the visible spectrum. (C) 2016 Elsevier B.V. All rights reserved.