Interface Engineering through Atomic Layer Deposition towards Highly Improved Performance of Dye-Sensitized Solar...

Area of Science:

• Materials Science
• Nanotechnology
• Renewable Energy

Background:

• Dye-sensitized solar cells (DSSCs) are a promising renewable energy technology.
• Improving photoanode performance is crucial for enhancing DSSC efficiency.
• Conventional titanium dioxide (TiO2) nanoparticles face limitations in light scattering and charge recombination.

Purpose of the Study:

• To develop and optimize a composite photoanode using ultralong zinc oxide (ZnO) nanobelts and TiO2 nanoparticles for DSSCs.
• To investigate the impact of ZnO nanobelts on light scattering, surface area, and recombination.
• To enhance electron transport and reduce recombination using Atomic Layer Deposition (ALD).

Main Methods:

• Ultralong ZnO nanobelts synthesized via a solution approach at 90°C, followed by annealing at 500°C.
• Fabrication of composite photoanodes with varying ratios of ZnO nanobelts to TiO2 nanoparticles.
• Application of Atomic Layer Deposition (ALD) to coat the nanostructures with a continuous TiO2 film.

Main Results:

• An optimal ratio of ZnO nanobelts to TiO2 nanoparticles improved photon-conversion efficiency by 61.4% compared to pure TiO2 photoanodes.
• ALD treatment significantly reduced recombination rates and increased carrier lifetime.
• The ALD-treated composite photoanode demonstrated a remarkable 137% enhancement in DSSC conversion efficiency.

Conclusions:

• Composite photoanodes of ultralong ZnO nanobelts and TiO2 nanoparticles offer superior performance in DSSCs.
• ALD is an effective technique for improving interface contact and charge transport in photoanodes.
• The developed photoanode architecture holds significant potential for advancing solar cell technology.