Highly Efficient Luminescent Solar Concentrators Based on Composition-Tunable ZnCuInSe/ZnSe Quantum Dots.

Area of Science:

• Materials Science
• Photovoltaics
• Nanotechnology

Background:

• Luminescent solar concentrators (LSCs) are key for building-integrated photovoltaics (BIPVs).
• Existing efficient LSCs often use toxic heavy metals (e.g., Pb, Cd).
• There is a need for eco-friendly, efficient LSC materials.

Purpose of the Study:

• To develop environmentally benign core/shell quantum dots (QDs) for LSCs.
• To investigate the effect of composition on the optical properties of ZnCuInSe/ZnSe (ZCISe/ZnSe) QDs.
• To fabricate and evaluate the performance of PMMA-based LSCs using these eco-friendly QDs.

Main Methods:

• Synthesis of ZCISe/ZnSe core/shell QDs with varying Zn/Cu ratios.
• Integration of QDs into a poly(methyl methacrylate) (PMMA) polymer matrix.
• Fabrication of LSC devices (10 × 10 × 0.5 cm³).
• Optical characterization and efficiency measurements under simulated and natural sunlight.

Main Results:

• Tuning the Zn/Cu molar ratio controllably shifted the absorption/emission spectra of ZCISe/ZnSe QDs.
• An LSC fabricated with a Zn/Cu ratio of 2/3 achieved an optimal optical efficiency of 3.38% (natural sunlight, 66 mW/cm²).
• External optical efficiency was measured at 3.59 ± 0.12% under natural sunlight (60-70 mW/cm²).

Conclusions:

• Eco-friendly ZCISe/ZnSe core/shell QDs offer tunable optical properties.
• These QDs are suitable for fabricating efficient, large-area LSCs for BIPVs.
• The developed QDs show significant potential for practical optoelectronic device applications.