Improving efficiency of semitransparent organic solar cells by constructing semitransparent microcavity

Area of Science:

• Materials Science
• Renewable Energy
• Optoelectronics

Background:

• Semitransparent organic solar cells are gaining interest for their ability to harvest near-infrared and ultraviolet light while allowing visible light to pass through.
• Their application in windows and displays requires optimization of both light harvesting and transparency.

Purpose of the Study:

• To investigate the impact of a microcavity incorporating 1-dimensional photonic crystals (1DPCs) on the performance of semitransparent organic solar cells.
• To analyze effects on power conversion efficiency, average visible transmittance, light utilization efficiency (LUE), and color coordinates.

Main Methods:

• Fabrication of semitransparent organic solar cells with a specific multilayer structure (Glass/MoO3/Ag/MoO3/PBDB-T:ITIC/TiO2/Ag/PML/1DPCs).
• Utilizing analytical calculations to model exciton density and displacement within the devices.
• Evaluating key performance metrics including power conversion efficiency, transmittance, LUE, and CIE color space coordinates.

Main Results:

• The inclusion of a microcavity enhanced power conversion efficiency by approximately 17% compared to devices without a microcavity.
• A slight decrease in transmission was observed, but the microcavity had a negligible effect on the color coordinates.
• The developed device demonstrated high-quality light transmission, perceived as near-white by the human eye.

Conclusions:

• Microcavities integrated with 1DPCs are effective in boosting the performance of semitransparent organic solar cells.
• These optimized devices maintain good color fidelity, making them suitable for applications requiring both energy generation and aesthetic transparency.