Dual Functional TiO2-Au Nanocomposite Material for Solid-State Dye-Sensitized Solar Cells

Area of Science:

• Materials Science
• Nanotechnology
• Renewable Energy

Background:

• Dye-sensitized solar cells (DSSCs) are a promising renewable energy technology.
• Solid-state electrolytes offer advantages over liquid electrolytes in DSSCs.
• Improving charge transfer and transport is crucial for enhancing DSSC performance.

Purpose of the Study:

• To develop and evaluate titanium dioxide-gold nanocomposite materials for solid-state electrolytes in DSSCs.
• To investigate the impact of gold nanoparticles on the photoanode and electrolyte performance.
• To compare the efficiency of DSSCs with modified components against unmodified systems.

Main Methods:

• Fabrication of dye-sensitized solar cells using titanium dioxide-gold nanocomposite ((TiO2-Au)(nps)) materials dispersed in poly(diallyldimethylammonium chloride) (PDDA) polymer electrolyte.
• Utilization of nanocrystalline TiO2 nanoparticle (P25) or (P25-Au)(nps) thin film photoanodes adsorbed with nickel-phthalocyanine (NiPcTs) dye sensitizer.
• Evaluation of photocurrent-photovoltage characteristics under standard AM 1.5 G simulated solar irradiation (100 mW/cm2).

Main Results:

• The (TiO2-Au)(nps) nanocomposite in the PDDA electrolyte improved interfacial charge transfer, reduced polymer crystallinity, and enhanced triiodide (I3-) redox couple mobility.
• This resulted in a six-fold increase in solar-to-electrical energy conversion efficiency compared to DSSCs with unmodified polymer electrolytes.
• Replacing the P25 photoanode with a (P25-Au)(nps) photoanode yielded an additional eight-fold efficiency increase due to improved charge transport.

Conclusions:

• Titanium dioxide-gold nanocomposites are effective in enhancing the performance of solid-state DSSCs.
• The strategic incorporation of gold nanoparticles into both the photoanode and electrolyte significantly boosts overall energy conversion efficiency.
• These findings highlight the potential of nanocomposite materials for advancing solar cell technology.