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<p>Alkylamino-substituted 1,4-naphthoquinones (2R-(<i>n</i>-alkylamino)1,4-naphthoquinone) as photosensitizers viz. HA5;2-(pentylamino)naphthalene-1,4-dione, HA6;2-(hexylamino)naphthalene-1,4-dione, HA7;2-(heptylamino)naphthalene-1,4-dione, and HA8;2-(octylamino)naphthalene-1,4-dione are first time used in TiO<sub>2</sub> and ZnO-based dye-sensitized solar cells (DSSCs). The UV–visible spectroscopy, Field Emission Scanning Electron Microscopy (FE-SEM), and X-ray diffraction (XRD) analysis for optical, morphological studies, and crystallinity characterize the photosensitizers and photosensitized photoanodes in DSSCs. The XRD pattern confirms the anatase and rutile phase in TiO<sub>2</sub> and the hexagonal wurtzite structure in ZnO. The UV–visible spectrum assigned the <i>π</i> → <i>π</i>* in the UV region and the <i>n</i> → <i>π</i>* transitions (charge transfer transition) in the visible region. The <i>J</i>–<i>V</i> characteristics were used to analyze the electrochemical properties of TiO<sub>2</sub> and ZnO-based photoanodes. The fabrication of the sandwich-type cell was used to observe photovoltaic performance and recording of the relevant parameters, such as short-circuit current (<i>J</i><sub><i>sc</i></sub>), open-circuit voltage (<i>V</i><sub><i>oc</i></sub>), and efficiency (<i>ƞ</i>). The ZnO/HA8 photoanode-based DSSCs show the maximum efficiency (<i>ɳ</i>) than other photoanodes (TiO<sub>2</sub>/HA5, TiO<sub>2</sub>/HA6, TiO<sub>2</sub>/HA7, TiO<sub>2</sub>/HA8, ZnO/HA5, ZnO/HA6, and ZnO/HA7) because of its improved photosensitizer loading and rapid electron injection.</p>

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Metal-free organic n-alkylamino-substituted 1,4-naphthoquinones as a photosensitizer in TiO2 and ZnO-based dye-sensitized solar cells

  • 期刊论文

  • 发表日期：

    2025年5月29日

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  • Sharad A. Mahadik,
  • Prashant D. Shitole,
  • Habib M. Pathan,
  • Sunita Salunke-Gawali

摘要

Alkylamino-substituted 1,4-naphthoquinones (2R-(n-alkylamino)1,4-naphthoquinone) as photosensitizers viz. HA5;2-(pentylamino)naphthalene-1,4-dione, HA6;2-(hexylamino)naphthalene-1,4-dione, HA7;2-(heptylamino)naphthalene-1,4-dione, and HA8;2-(octylamino)naphthalene-1,4-dione are first time used in TiO2 and ZnO-based dye-sensitized solar cells (DSSCs). The UV–visible spectroscopy, Field Emission Scanning Electron Microscopy (FE-SEM), and X-ray diffraction (XRD) analysis for optical, morphological studies, and crystallinity characterize the photosensitizers and photosensitized photoanodes in DSSCs. The XRD pattern confirms the anatase and rutile phase in TiO2 and the hexagonal wurtzite structure in ZnO. The UV–visible spectrum assigned the π → π* in the UV region and the n → π* transitions (charge transfer transition) in the visible region. The J–V characteristics were used to analyze the electrochemical properties of TiO2 and ZnO-based photoanodes. The fabrication of the sandwich-type cell was used to observe photovoltaic performance and recording of the relevant parameters, such as short-circuit current (Jsc), open-circuit voltage (Voc), and efficiency (ƞ). The ZnO/HA8 photoanode-based DSSCs show the maximum efficiency (ɳ) than other photoanodes (TiO2/HA5, TiO2/HA6, TiO2/HA7, TiO2/HA8, ZnO/HA5, ZnO/HA6, and ZnO/HA7) because of its improved photosensitizer loading and rapid electron injection.