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Enhancement in the solar efficiency of a dye-sensitized solar cell by molecular engineering of an organic dye incorporating N-alkyl-attached 1,8-naphthalamide derivative

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Abstract

Controlling the orientation of the dye molecules adsorbed on the TiO2 surface needs extensive attention for improving the photovoltaic parameters of dye-sensitized solar cells (DSSCs). The suppression of the charge recombination and self-aggregation of dye molecules on the TiO2 surface also plays a vital role in the improvement of cell efficiency. In this report, based on the bi-anchored structure containing N-alkyl-attached 1,8-naphthalamide derivative as the donor system and spiroBiproDOT as the π-spacer, an organic dimeric dye (D-Dye) was designed and synthesized by Suzuki coupling, followed by Knoevenagel condensation. The maximum power conversion efficiency of 7.1% with a Voc and Jsc of 0.70 V and 14.6 mA cm−2, respectively, was achieved for the DSSC employing D-Dye. A monomeric dye (M-Dye) was also synthesized and the resultant cell efficiency of 4.85% was achieved with Voc and Jsc of 0.67 V and 9.93 mA cm−2, respectively, which was 33% lower than that of its dimeric analogue (D-Dye). The photo-physical experiment was carried out for both organic dyes to understand their light absorption characteristics. The incident photon-to-current conversion efficiency (IPCE) and electrochemical impedance measurements were also obtained to rationalize the better photovoltaic performance of DSSCs employing the dimeric D-Dye, which was due to the effective suppression of the charge recombination and self-aggregation of dye molecules. The co-adsorption of D-Dye (0.4 mM) with N-719 (0.4 mM) in the ratio of 10 : 1 v/v (D-Dye:N-719) further enhanced the cell efficiency to 8.34% (Voc of 0.77 V and Jsc of 14.9 mA cm−2).

Graphical abstract: Enhancement in the solar efficiency of a dye-sensitized solar cell by molecular engineering of an organic dye incorporating N-alkyl-attached 1,8-naphthalamide derivative

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Supplementary files

Article information


Submitted
18 Mar 2020
Accepted
13 May 2020
First published
15 May 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

Enhancement in the solar efficiency of a dye-sensitized solar cell by molecular engineering of an organic dye incorporating N-alkyl-attached 1,8-naphthalamide derivative

M. C. Sil, L. Chen, C. Lai, C. Chang and C. Chen, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/D0TC01388A

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