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Dielectric Screening Modulates Semiconductor Nanoplatelet Excitons.

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Colloidally grown nanoplatelets (NPLs) show thickness-dependent exciton binding energies influenced by dielectric environments. Surface modification offers a route to tune their photophysical and device properties.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Physics

Background:

  • External dielectric environments significantly influence 2D semiconductor materials.
  • This influence is largely overlooked for colloidally grown II-VI nanoplatelets (NPLs).

Purpose of the Study:

  • To investigate the impact of dielectric environments on II-VI NPLs.
  • To determine exciton binding energies and their modulation by material thickness and dielectric screening.
  • To establish NPLs as colloidal analogues of 2D semiconductors.

Main Methods:

  • Synthesis of MX (M = Cd, Hg; X = Se, Te) NPLs with varying thicknesses.
  • Application of the Elliott model to extract exciton binding energies.
  • Utilizing polarizable solvents to alter and recover exciton binding energy in HgTe NPLs.

Main Results:

  • Exciton binding energies were accurately extracted using the Elliott model for various NPLs.
  • Exciton binding energy is modulated by internal/external dielectric effects and NPL thickness.
  • Dielectric screening was shown to increase exciton binding energy relative to bulk materials.
  • Experimental confirmation of dielectric screening effects using HgTe NPLs in polarizable solvents.

Conclusions:

  • Colloidally grown NPLs exhibit properties analogous to van der Waals 2D semiconductors.
  • Surface modification of NPLs can be used to control their photophysical and device characteristics.