Closed-Surface Multifunctional Antireflective Coating Made from SiO₂ with TiO₂ Nanocomposites

Area of Science:

• Materials Science
• Nanotechnology
• Photovoltaics

Background:

• Antireflective coatings are crucial for enhancing light transmission in optical devices.
• Developing durable and efficient coatings with additional functionalities like self-cleaning is an ongoing challenge.
• Existing coatings often lack long-term reliability in harsh environmental conditions.

Purpose of the Study:

• To fabricate a novel SiO2-TiO2 closed-surface antireflective coating using a facile one-dipping method.
• To characterize the microstructure and surface morphology of the developed coating.
• To evaluate the optical performance, photovoltaic enhancement, and environmental reliability of the coating.

Main Methods:

• Fabrication of SiO2-TiO2 nanocomposite sol using silica hollow nanospheres and TiO2 nanoparticles.
• Characterization of sol-gel microstructure via transmission electron microscopy (TEM).
• Surface morphology analysis using field emission scanning electron microscopy (FESEM) and atomic force microscopy (AFM).
• Optical performance evaluation through transmittance measurements and refractive index determination.
• Photovoltaic (PV) module performance assessment using current-voltage (IV) curves and external quantum efficiency (EQE) tests.

Main Results:

• Achieved high transmittance up to 94.03% on PV glass with a refractive index of ~1.30.
• Demonstrated a short-circuit current gain of 2.14-2.32% in PV modules.
• Exhibited excellent long-term reliability and robustness in high-moisture and high-temperature environments due to a void-free surface.
• Showcased significant photocatalytic activity, contributing to a self-cleaning function.

Conclusions:

• The developed SiO2-TiO2 antireflective coating offers superior optical performance and enhanced PV module efficiency.
• The coating's closed-surface structure ensures exceptional durability and reliability under adverse environmental conditions.
• The integrated self-cleaning property makes this coating highly suitable for applications in windows and photovoltaic modules.