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- Title
Fabrication of an efficient amino substituted 1,4-naphthoquinones sensitized TiO<sub>2</sub> nanograin based dye sensitized solar cells.
- Authors
Mahadik, Sharad A.; Pathan, Habib M.; Salunke-Gawali, Sunita
- Abstract
The amino substituted 1,4-naphthoquinone photosensitizers, viz; BrA5; 2-bromo-3-(pentylamino)naphthalene-1,4-dione, BrA6; 2-bromo-3-(hexylamino)naphthalene-1,4-dione, BrA7; 2-bromo-3-(heptylamino)naphthalene-1,4-dione, BrA8; 2-bromo-3-(octylamino)naphthalene-1,4-dione, have been synthesized from 2,3-dibromonaphthalene-1,4-dione. These photosensitizers were employed for the first time in TiO2NG-based dye-sensitized solar cells (DSSCs). The TiO2 nanograin (TiO2NG) compact layer was prepared using chemical bath deposition to reduce the electron recombination. The porous layer of TiO2NG was deposited using the doctor blade method, followed by calcination at 450 °C. After sensitization of BrA5, BrA6, BrA7, and BrA8 photosensitizers on the TiO2NG photoelectrodes, the optical properties of photoelectrodes show the broad band each in the visible region, which is assigned to n → π* charge-transfer transition. FT-IR analysis of photosensitizers showed the existence of N–H bands. The XRD pattern of TiO2NG photoanode confirmed the anatase and rutile phase. The E0-0 and HOMO–LUMO energy levels were calculated using UV–visible, fluorescence spectroscopy, and cyclic voltammetry, respectively. The E0-0 of BrA5 and BrA7 is 2.35 eV, while that of BrA6 and BrA8 is 2.33 eV. The DSSCs system is fabricated by loading the BrA5, BrA6, BrA7, and BrA8 photosensitizers on TiO2NGs. The photosensitizer's photovoltaic performances of TiO2NG-based electrodes were studied through electrochemical impedance analysis. The J–V curve analysis and characterization show that the efficient light absorption and reduction of charge recombination at the TiO2NG photoanodes are the main reasons for the efficiency of the TiO2NG/BrA5, TiO2NG/BrA6, TiO2NG/BrA7, and TiO2NG/BrA8 photoelectrodes. Compared to DSSCs employing other photosensitizers (BrA5, BrA6, and BrA7) on a TiO2NG photoelectrode (TiO2NG/BrA5 (0.33%), TiO2NG/BrA6 (0.35%), TiO2NG/BrA7 (0.36%), those using BrA8 demonstrate higher power conversion efficiencies. Specifically, TiO2NG/BrA8 shows the highest efficiency at 0.43%. The enhanced performance of the TiO2NG/BrA8-based DSSC can be attributed to its increased dye loading and rapid electron injection. The present study will open a new route to fabricate highly efficient DSSCs using amino-substituted 1,4-naphthoquinone photosensitizers.
- Publication
Journal of Materials Science: Materials in Electronics, 2024, Vol 35, Issue 17, p1
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-024-12935-4