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19 October 2021
  » arxiv » 1411.3408

 Article overview

Strain effects on optical properties of tetrapod-shaped CdTe/CdS core-shell nanocrystals
Yuanzhao Yao ; Takashi Kuroda ; Dmitry N. Dirin ; Maria S. Sokolikova ; Roman B. Vasiliev ;
Date 13 Nov 2014
AbstractThe exciton states of strained CdTe/CdS core-shell tetrapod-shaped nanocrystals were theoretically investigated by the numerical diagonalization of a configuration interaction Hamiltonian based on the single-band effective mass approximation. We found that the inclusion of strain promotes the type-II nature by confining the electrons and holes in nonadjacent regions. This carrier separation is more efficient than that with type-II spherical nanocrystals. The strain leads to a small blue shift of the lowest exciton energy. Its magnitude is smaller than the red shift induced by increasing the shell thickness. Moreover, the larger arm diameter reduces the influence of both shell thickness and strain on the exciton energy. Considering the broken symmetry, a randomness induced carrier separation was revealed which is unique to a branched core-shell structure. The calculated shell thickness dependence of the emission energy agrees well with available experimental data.
Source arXiv, 1411.3408
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