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Phys. Rev. B 62, 12613–12616 (2000)

Hole levels and exciton states in CdS nanocrystals

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Jingbo Li
National Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing 100083, People’s Republic of China

Jian-Bai Xia
China Center of Advanced Sciences and Technology (World Laboratory), P.O. Box 8730, Beijing 100080, People’s Republic of China
National Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing 100083 People’s Republic of China

Received 21 March 2000; revised 31 May 2000; published in the issue dated 15 November 2000

We have studied the hole levels and exciton states in CdS nanocrystals by using the hole effective-mass Hamiltonian for wurtzite structure. It is found that the optically passive Px state will become the ground hole state for small CdS quantum dots of radius less than 69 Å. It suggests that the “dark exciton” would be more easily observed in the CdS quantum dots than that in CdSe quantum dots. The size dependence of the resonant Stokes shift is predicted for CdS quantum dots. Including the Coulomb interaction, exciton energies as functions of the dot radius are calculated and compared with experimental data.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.62.12613
DOI:
10.1103/PhysRevB.62.12613
PACS:
73.20.Dx, 78.66.Hf
 
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