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Directionally Emissive Luminescent Solar Concentrators Enabled by Electrically Aligned Quantum Rods within a Polymer

Nan Ren1, Muhammad Umer1, Edoardo Carraro2

  • 1Qingdao University, College of Physics, College of Textiles and Clothes, State Key Laboratory of Bio-Fibers and Eco-Textiles, No. 308 Ningxia Road, Qingdao 266071, People's Republic of China.

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Summary
This summary is machine-generated.

Directional emission in luminescent solar concentrators (LSCs) significantly boosts efficiency by enhancing total internal reflection (TIR) and reducing light loss. This study used aligned quantum rods to achieve a 1.23-fold improvement in LSC performance.

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Area of Science:

  • Materials Science
  • Photovoltaics
  • Optoelectronics

Background:

  • Luminescent solar concentrators (LSCs) offer a cost-effective, transparent photovoltaic solution.
  • Total internal reflection (TIR) is crucial for concentrating light in LSCs.
  • Light propagation losses and emitter aggregation can limit LSC efficiency.

Purpose of the Study:

  • To investigate the impact of directional emission on LSC efficiency.
  • To enhance TIR efficiency and mitigate light propagation losses in LSCs.
  • To develop a method for controlling emitter orientation in LSCs.

Main Methods:

  • Utilized highly bright and polarized CdSe/CdZnS quantum rods (QRs) as emitters.
  • Developed an electrically aligned photopolymerization technique to orient QRs.
  • Fabricated and characterized laminated-glass LSC devices.

Main Results:

  • Directional emission was shown to enhance TIR efficiency and reduce light losses.
  • The electrically aligned LSC device exhibited a 1.23-fold efficiency improvement over isotropic counterparts.
  • A 3.5×3.5×0.85 cm³ device achieved a power conversion efficiency of ~4.92% and light utilization efficiency of ~2.39% with >60% transmittance.

Conclusions:

  • Controlling emitter orientation in LSCs is key to improving device performance.
  • Directionally emitting LSCs offer a promising pathway for efficient transparent photovoltaic technologies.
  • The developed LSC technology rivals state-of-the-art transparent photovoltaic devices.