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All Journal Jurnal Kimia Riset Jurnal Teknik Terapan (J-TETA)
Gusmar Lina, Resi
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Tannin-Based Natural Dye for DSSC: Polymerization Strategies to Maximize Efficiency Hardeli; Ade Putri, Annisa; Gusmar Lina, Resi; Feronika, Widi; permatasari, Putri
Jurnal Kimia Riset Vol. 10 No. 1 (2025): June
Publisher : Universitas Airlangga, Campus C Mulyorejo, Surabaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jkr.v10i1.70387

Abstract

Dye-sensitised solar cells (DSSCs) use dyes to absorb sunlight. Tannin is an eco-friendly natural dye alternative. However, the efficiency of tannin-based DSSCs is still low due to the limited number of conjugated double bonds. This study aims to improve the efficiency of DSSCs by polymerising tannin in two steps: Formaldehyde condensation under acidic conditions and glutaraldehyde crosslinking in alkaline medium. Parameter variations included initiator concentration (KOH vs. NaOH), crosslinking agent volume, polymerization time and temperature, and tannin monomer concentration. Characterization by FTIR and UV-Vis showed an increase in light absorption after polymerisation. The best results were obtained at 120°C, 2% NaOH initiator, 2.5 mL glutaraldehyde volume and 90 min reaction time, with DSSC efficiency reaching 9.18%, a fourfold increase compared to pure tannin (2.18%). This study shows that tannin polymerization significantly improves the efficiency of DSSCs, so it has the potential to be developed as a more efficient natural dye for photovoltaic applications.
Enhancing DSSC Performance through Metal-Doped TiO₂ and Poly-Tannin Dye: A Study on Bandgap Reduction and Photon Absorption Hardeli, Hardeli; Ade Putri, Anisa; Gusmar Lina, Resi; Feronika, Widi; Permatasari, Putri
Jurnal Teknik Terapan Vol. 4 No. 1 (2025): April
Publisher : P3M Politeknik Negeri Jember

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Abstract

Dye-sensitized solar cells (DSSC) are a promising alternative to conventional solar cells by using dye molecules to absorb sunlight and facilitate energy conversion. In this study, tannins were used as the dye. Tannins can be polymerized into poly-tannins, which increases the amount of double bonds and therefore improves photon absorption. Furthermore, this study will also examine how metal doping affects the TiO₂ semiconductor to further enhance its performance. The selected dopants—Cu, Fe, and Ag—were tested for their capacity to change the bandgap and increase electron mobility. Experiments showed that metal doping lowered the bandgap of TiO₂, resulting in better electron excitation and charge transfer. Under optimum conditions, the combination of poly-tannin dye and TiO₂-Ag semiconductor resulted in the highest DSSC efficiency (9.18%). Based on this, it can be concluded that combining metal-doped TiO₂ with poly-tannin dyes can greatly improve DSSC performance.
Co-Authors Ade Putri, Anisa Ade Putri, Annisa Feronika, Widi Hardeli Hardeli Hardeli Putri Permatasari, Putri