Enhanced Haze Ratio on Glass by Novel Vapor Texturing Method

Area of Science:

• Materials Science
• Renewable Energy
• Nanotechnology

Background:

• Tandem thin film silicon solar cells require enhanced light trapping for improved efficiency.
• Current texturing methods face limitations in optimizing optical properties.

Purpose of the Study:

• To investigate advanced texturing techniques for enhancing light trapping in tandem thin film silicon solar cells.
• To optimize the vapor texturing process for reduced reflectance and increased haze.

Main Methods:

• Utilized a wet etch process with diluted nitric acid (HNO3) and hydrofluoric acid (HF) for glass surface texturing.
• Developed a vapor texturing method by generating vapor from silicon in an HF:HNO3 acidic solution.
• Performed anisotropic etching on vapor-textured wafers to achieve specific depths and optical properties.

Main Results:

• Achieved an etching depth of approximately 2.78 μm using the vapor texturing method.
• Reduced surface reflectance by 5% through optimized etching parameters.
• Obtained a high haze value of 74.6% at 540 nm wavelength by adjusting etching time and HF concentration.

Conclusions:

• Vapor texturing offers a promising approach for enhancing optical properties in thin film silicon solar cells.
• Optimized etching parameters, including time and acid concentration, are crucial for maximizing light trapping effectiveness.
• The developed method shows potential for significantly improving the performance of tandem solar cell devices.