Microcavity-enhanced light-trapping for highly efficient organic parallel tandem solar cells

Area of Science:

• Materials Science
• Renewable Energy
• Optoelectronics

Background:

• Tandem solar cells offer enhanced light absorption.
• Achieving high performance in parallel tandem configurations remains challenging.
• Intermediate anodes play a crucial role in device architecture.

Purpose of the Study:

• To demonstrate a high-performance parallel tandem solar cell.
• To investigate the use of ultra-thin silver as an intermediate anode.
• To enhance light utilization efficiency and photovoltaic performance in organic solar cells.

Main Methods:

• Fabrication of a parallel tandem solar cell with semitransparent front and microcavity-assisted back sub-cells.
• Utilizing ultra-thin silver (Ag) as the intermediate anode.
• Characterization of optical and photovoltaic properties, including external quantum efficiency (EQE).

Main Results:

• The tandem architecture extended the optical field.
• A microcavity resonance in the back sub-cell significantly boosted light utilization.
• Achieved a peak external quantum efficiency (EQE) over 80%.
• Demonstrated a high power conversion efficiency (PCE) of 9.2%.

Conclusions:

• The developed architecture effectively improves light utilization and photovoltaic performance.
• Ultra-thin silver is a viable intermediate anode for high-performance tandem solar cells.
• This architecture is broadly applicable to various organic materials for performance enhancement.