Performance evaluation of thin film silicon solar cell based on dual diffraction grating

Area of Science:

• Materials Science
• Renewable Energy Engineering
• Optoelectronics

Background:

• Thin film silicon solar cells require effective light-trapping for optimal performance.
• Advanced solar cell design engineering is crucial for improving energy conversion efficiency.
• Back reflectors incorporating gratings and distributed Bragg reflectors (DBRs) are key to enhancing light absorption.

Purpose of the Study:

• To investigate the impact of bottom grating and dual (top and bottom) grating structures on light absorption in thin film silicon solar cells.
• To explore the role of a metal layer in conjunction with DBRs for efficient light management.
• To optimize grating and anti-reflection coating thicknesses for maximum absorption enhancement.

Main Methods:

• Simulated and designed thin film silicon solar cells with novel back reflector configurations.
• Incorporated bottom grating and dual grating structures with distributed Bragg reflectors (DBRs).
• Investigated the influence of metal layers and varied grating/anti-reflection coating thicknesses on optical absorption.

Main Results:

• Dual grating-based solar cells achieved a relative short-circuit current enhancement of approximately 68%.
• Bottom grating-based solar cells showed a relative short-circuit current enhancement of approximately 55%.
• Optimized designs demonstrated enhanced light absorption in the ultraviolet (UV) and infrared regions of the solar spectrum.

Conclusions:

• Dual grating structures integrated with back reflectors offer superior performance for thin film silicon solar cells.
• The strategic use of gratings and anti-reflection coatings significantly improves light absorption and solar cell efficiency.
• This design approach holds promise for advancing thin film solar cell technology through enhanced light management.