Iterative method for optical modelling of perovskite-based tandem solar cells.

Area of Science:

• Materials Science
• Optoelectronics
• Renewable Energy

Background:

• Accurate optical modeling is crucial for optimizing semitransparent perovskite solar cells.
• Understanding optical losses is key to improving device efficiency.
• Tandem solar cells offer higher efficiencies but require careful design of individual layers.

Purpose of the Study:

• To present an iterative method for modeling the optical properties of semitransparent perovskite solar cells.
• To identify primary sources of optical losses within these devices.
• To couple optical and electrical models for perovskite/silicon tandem solar cells to analyze performance.

Main Methods:

• Iterative modeling approach based on spectroscopic characterizations.
• Inclusion of porosity and incoherence effects in the optical model.
• Coupling of the optical model with an electrical model for 4-terminal (4T) perovskite/silicon tandem solar cells.

Main Results:

• Determination of complex refractive indices for each layer of the perovskite solar cell.
• Identification of significant optical loss mechanisms.
• Evaluation of the interplay between optical and electrical losses in tandem devices.
• Assessment of efficiency balance between top (perovskite) and bottom (silicon) cells.

Conclusions:

• The developed iterative method effectively models perovskite solar cell optical properties.
• The model aids in identifying and mitigating optical losses.
• Coupled optical-electrical modeling is essential for designing high-performance perovskite/silicon tandem solar cells.