Tin(II) Dithiocarbamate-Derived SnS Nanoparticles for High-Performance Quantum Dot-Sensitized Solar Cells.

Area of Science:

• Materials Science
• Nanotechnology
• Renewable Energy

Background:

• Global demand for renewable energy drives solar cell research.
• Quantum dot-sensitized solar cells (QDSSCs) offer tunable properties and enhanced light absorption.
• Tin sulfide (SnS) quantum dots are explored for their potential in solar energy conversion.

Purpose of the Study:

• To investigate the impact of precursor ligand chemistry on SnS quantum dot properties.
• To correlate material characteristics with photovoltaic performance in QDSSCs.
• To optimize SnS quantum dot synthesis for improved solar cell efficiency.

Main Methods:

• Synthesis of SnS quantum dots using dithiocarbamate complexes with m-toluidine, aniline, and p-toluidine ligands.
• Characterization using structural (XRD) and morphological (TEM) analyses.
• Optical measurements (bandgap determination) and photovoltaic device fabrication and testing.

Main Results:

• Orthorhombic SnS phase confirmed for all synthesized quantum dots.
• Varying nanocrystal sizes and aggregation observed: SnS1 (5.93 nm), SnS2 (8.57 nm), SnS3 (6.67 nm).
• Bandgap energies determined as 2.8 eV (SnS1), 2.2 eV (SnS2), and 2.7 eV (SnS3).
• Power conversion efficiencies achieved: 3.40% (SnS1), 2.03% (SnS2), and 7.63% (SnS3).
• SnS3 demonstrated reduced charge recombination and superior performance.

Conclusions:

• Precursor ligand selection critically influences SnS quantum dot morphology, optical properties, and charge transport.
• The p-toluidine ligand (SnS3) yielded optimal characteristics for high-performance QDSSCs.
• This study highlights the importance of precursor chemistry in tailoring quantum dots for efficient solar energy harvesting.