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Surface effects on capped and uncapped nanocrystals.

Garnett W Bryant1, W Jaskolski

  • 1Atomic Physics Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8423, USA. garnett.bryant@nist.gov

The Journal of Physical Chemistry. B
|July 21, 2006
PubMed
Summary
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Surface passivation critically impacts semiconductor nanocrystal properties. Unpassivated surfaces create detrimental electronic states, while ZnS shells effectively shield CdS nanocrystals, preserving their functionality.

Area of Science:

  • Materials Science
  • Quantum Chemistry
  • Nanotechnology

Background:

  • Surface effects significantly alter semiconductor nanocrystal functionality.
  • Atomic-scale surface descriptions are crucial for theoretical understanding.
  • Passivation strategies are key to controlling nanocrystal properties.

Purpose of the Study:

  • To theoretically investigate the electronic and optical properties of CdS and CdS/ZnS nanocrystals.
  • To elucidate the impact of surface passivation on nanocrystal electronic states.
  • To determine the effectiveness of ZnS shells in mitigating surface effects.

Main Methods:

  • Atomistic tight-binding theory applied to CdS and CdS/ZnS nanocrystals.
  • Modeling of passivated and unpassivated surface conditions.

Related Experiment Videos

  • Analysis of electronic band structure and surface states.

    • Main Results:

    • Fully passivated CdS nanocrystals exhibit no surface states within the band gap.
    • Unpassivated anion dangling bonds create narrow surface-state bands above the valence band edge.
    • Unpassivated cation dangling bonds lead to mixed surface/internal states above the conduction band edge.
    • Partial passivation can introduce detrimental states into the band gap.
    • Six monolayers of ZnS capping are required to eliminate surface state influence on internal states.

    Conclusions:

    • Surface passivation critically influences the electronic and optical properties of semiconductor nanocrystals.
    • Explicit surface models are necessary for accurate theoretical descriptions.
    • CdS/ZnS core/shell structures effectively isolate internal states from surface effects.