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Journal of Computer-Aided Materials Design

, Volume 14, Issue 1, pp 167–174 | Cite as

Discrete size series of CdSe quantum dots: a combined computational and experimental investigation

  • M. Yu
  • G. W. Fernando
  • R. Li
  • F. Papadimitrakopoulos
  • N. Shi
  • R. RamprasadEmail author
Original Paper

Abstract

Ab initio computational studies were performed for CdSe nanocrystals (NCs) over a wide variety of sizes ranging from 8 to 150 atoms in conjunction with recent experimental work. The density functional based calculations indicate substantial relaxations. Changes in coordination of surface atoms were found to play a crucial role in determining the NC stability and optical properties. While optimally (threefold) coordinated surface atoms resulted in stable closed-shell structures with large optical gaps, sub-optimal coordination gave rise to lower stability and negligible optical gaps. These computations are in qualitative agreement with recent chemical etching experiments suggesting that closed shell NCs contribute strongly to photoluminescence quantum yield while clusters with nonoptimal surface coordination do not.

Keywords

Semiconductor quantum dots Cadmium compounds Ab initio calculation Energy gap Photoluminescence Surface structure 

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Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  • M. Yu
    • 1
  • G. W. Fernando
    • 1
  • R. Li
    • 2
  • F. Papadimitrakopoulos
    • 2
  • N. Shi
    • 3
  • R. Ramprasad
    • 3
    Email author
  1. 1.Department of PhysicsUniversity of ConnecticutStorrsUSA
  2. 2.Polymer Program and Department of ChemistryUniversity of ConnecticutStorrsUSA
  3. 3.Department of Chemical, Materials and Biomolecular EngineeringUniversity of ConnecticutStorrsUSA

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