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Finite-Size Effect on Band Structure and Photoluminescence of Semiconductor Nanocrystals

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3 Author(s)
Lang, X.Y. ; Jilin Univ., Changchun ; Zheng, W.T. ; Jiang, Q.

Based on a model for size-dependent atomic cohesive energy of nanocrystals, a simple and unified model, without any adjustable parameter, has been established for finite size effect on shifts of valence and conduction band edges [DeltaEV(D) and DeltaEC(D)], and bandgap expansion [DeltaEG(D)| of semiconductor nanocrystals, where Delta denotes the expansion and D is the size of nanocrystals. In the light of this model, DeltaEV(D), DeltaEC(D), and DeltaEG(D) functions increase with dropping D in comparison with the corresponding bulk counterparts. The available experimental results of Si, CdS, ZnSe, and ZnTe nanocrystals confirm the validity of model.

Published in:

Nanotechnology, IEEE Transactions on  (Volume:7 ,  Issue: 1 )

Date of Publication:

Jan. 2008

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