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Light management using CsPbBr₃colloidal quantum dots for luminescent solar concentrators.

Akhilesh Kumar Singh¹

¹Department of Physical Sciences, Banasthali Vidyapith, Banasthali-304022, Rajasthan, India.

Methods and Applications in Fluorescence

|September 17, 2020

Summary

Cesium lead bromide (CsPbBr₃) quantum dots were synthesized for luminescent solar concentrators. These quantum dots exhibit excellent optical properties and stability, achieving a 5.4% conversion efficiency.

Keywords:

CsPbBr3 halide perovskite luminescent solar concentrators photoluminescence quantum dots

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Area of Science:

Materials Science
Nanotechnology
Photovoltaics

Background:

Colloidal quantum dots (CQDs) offer tunable optical properties for advanced applications.
Cesium lead bromide (CsPbBr₃) is a promising perovskite material for optoelectronic devices.
Luminescent solar concentrators (LSCs) aim to enhance solar energy harvesting efficiency.

Purpose of the Study:

To synthesize CsPbBr₃ colloidal quantum dots using the hot-injection method.
To characterize the optical and photophysical properties of the synthesized CQDs.
To fabricate and evaluate an LSC device utilizing CsPbBr₃ CQDs.

Main Methods:

Hot-injection synthesis of spherical CsPbBr₃ CQDs (∼10.5 nm diameter).
UV-vis absorption and photoluminescence spectroscopy for optical characterization.
Photoluminescence quantum yield (PLQY) and time-resolved photoluminescence (TRPL) measurements.
Fabrication of an LSC device with CQDs embedded in poly(methyl methacrylate) (PMMA).

Main Results:

Synthesized CsPbBr₃ CQDs with a bandgap of ∼2.3682 eV and emission peak at 2.352 eV.
Achieved a high absolute PLQY of 60 ± 1% in PMMA.
Measured a photoluminescence decay time of 25.36 ns.
Fabricated LSC demonstrated an external optical conversion efficiency of ∼5.4% under one sun illumination.

Conclusions:

CsPbBr₃ CQDs possess favorable properties for LSC applications, including broad spectral absorption and high PLQY.
The fabricated LSC exhibits high external optical conversion efficiency and good photostability, thermal stability, and long-term ambient stability.
CsPbBr₃ CQDs show potential for superior performance compared to other materials in LSC devices.