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Enhancement of Solar Efficiency of Dye-Sensitized Solar Cell by Molecular Engineering of Organic Dye Incorporating N-alkyl Attached 1, 8-Naphthalamide Derivative

Abstract

Controlling orientation of dye molecules adsorbed on TiO2 surface needs extensive attention for improving the photovoltaic parameters of dye-sensitized solar cells (DSSCs). Suppression of charge recombination and self-aggregation of dye molecules on TiO2 surface also plays a vital role in the improvement of cell efficiency. In this report, based on the bi-anchoring structure containing N-alkyl attached 1, 8-naphthalamide derivative as a donor system and spiroBiproDOT as a π-spacer, an organic dimeric dye (D-Dye) was designed and synthesized by incorporating 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/cm2, respectively, was achieved for the DSSC employing D-Dye. A monomeric dye (M-Dye) was also synthesized and the resultant cell efficiency achieved 4.85 % with Voc and Jsc of 0.67 V and 9.93 mA/cm2, respectively, which was 33% lower than that of its dimeric analogue (D-Dye). Photo-physical experiment was carried out for both organic dyes to understand their light absorption characteristics. Incident-photon to current conversion efficiency (IPCE) and electrochemical impedance measurements were also performed to rationalize the better photovoltaic performance of DSSCs employing the dimeric D-Dye, which was due to effective suppression of charge recombination and self-aggregation of dye molecules. Co-adsorption of D-Dye (0.4 mM) with N-719 (0.4 mM) in a ratio of 10:1 (D-Dye: N-719) v/v further enhanced the cell efficiency to 8.34 % (Voc of 0.77 V and Jsc of 14.9 mA/cm2).

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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, Accepted Manuscript
Article type
Paper

Enhancement of Solar Efficiency of Dye-Sensitized Solar Cell by Molecular Engineering of 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, Accepted Manuscript , DOI: 10.1039/D0TC01388A

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