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Large Band Edge Tunability in Colloidal Nanoplatelets.

Qunfei Zhou1,2, Yeongsu Cho3, Shenyuan Yang4,5

  • 1Materials Research Science and Engineering Center , Northwestern University , Evanston , Illinois 60208 , United States.

Nano Letters
|September 24, 2019
PubMed
Summary

Organic ligands significantly tune the electronic band edges of cadmium selenide nanoplatelets (NPLs) by up to 5 eV. This ligand control offers promising pathways for advanced optoelectronic and photochemical applications.

Keywords:
Colloidal nanoplateletDFTband edge energiesband gapeffective mass modelself-energy correction

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Area of Science:

  • Materials Science
  • Quantum Chemistry
  • Nanotechnology

Background:

  • Quasi-two-dimensional (2D) colloidal cadmium selenide nanoplatelets (NPLs) are promising nanomaterials.
  • Understanding surface ligand effects is crucial for tailoring NPL properties.

Purpose of the Study:

  • To investigate the impact of organic surface ligands on the electronic structure and band edge energies of 2D colloidal cadmium selenide NPLs.
  • To explore the tunability of NPL band edges through ligand engineering.

Main Methods:

  • Density functional theory (DFT) calculations were employed.
  • A model self-energy approach was used to account for dielectric contrast.
  • An effective mass model for excitons was utilized.

Main Results:

  • Organic ligands induce significant shifts in band edge energies (up to 5 eV) with minimal impact on NPL band gaps.
  • Ligand-NPL interface dipoles are key to controlling band edge positions.
  • Band edge tunability is strongly dependent on NPL thickness.

Conclusions:

  • Surface ligand engineering provides a powerful method to tune the electronic properties of cadmium selenide NPLs.
  • The observed band edge tunability, combined with thickness-dependent optical band gaps, suggests potential for enhanced photochemical and optoelectronic applications.