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Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light

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Improving power conversion efficiency in luminescent solar concentrators using nanoparticle fluorescence and

Qingyang Lu¹, Shuhong Xu¹, Haibao Shao²

¹Advanced Photonics Center, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, People's Republic of China.

|August 1, 2020

Summary

Researchers enhanced luminescent solar concentrators (LSCs) by introducing dual transmission modes. This dual-mode approach, using fluorescence and scattering light, significantly boosts power conversion efficiency (PCE) in large-area LSCs.

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Area of Science:

Materials Science
Renewable Energy Technologies
Photovoltaics

Background:

Large-size luminescent solar concentrators (LSCs) are crucial for complementing silicon-based photovoltaic (Si-PV) systems.
Current LSCs face limitations due to low power conversion efficiency (PCE), particularly in large-scale applications.
Improving LSC performance is a key research objective for advancing solar energy harvesting.

Purpose of the Study:

To enhance the PCE of large-size LSCs by introducing a novel dual transmission mode.
To investigate the combined effect of fluorescence and light scattering for improved light absorption in Si-PV systems.
To develop a cost-effective and scalable method for producing high-performance LSCs.

Main Methods:

Fabrication of LSCs using ultraviolet light-induced polymerization of methyl methacrylate (MMA) containing luminescent CsPbBr₃ and TiO₂ nanocrystals (NCs).
Coupling Si-PV systems to the edges of the light-harvesting slice.
Characterization of LSCs under incident light to evaluate fluorescence and scattering transmission modes.

Main Results:

A dual transmission mode (fluorescence and scattering) was successfully implemented in LSCs by incorporating TiO₂ NCs.
TiO₂-doped LSCs demonstrated improved PCE compared to pure CsPbBr₃ LSCs, with a 20 cm × 20 cm device achieving 1.82% PCE (up from 0.97%).
Maximal PCE of 2.62% was achieved for LSCs with a 5 cm × 5 cm size.

Conclusions:

The dual transmission mode strategy offers a new pathway to enhance LSC performance without altering luminescent material optical properties.
The developed method is simple, low-cost, and suitable for large-area LSC fabrication, promoting wider application.
This approach effectively increases light absorption by Si-PV systems, paving the way for more efficient solar energy conversion.