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Hole emission from self-organized Ge quantum dots with a diameter of ∼70 nm in a Si matrix is investigated by time-resolved capacitance spectroscopy [deep level transient spectroscopy (DLTS)]. A complex DLTS signal is observed and explained in terms of thermally activated emission from localized many-particle states. In particular, a gradually decreasing activation energy is found with increasing hole population. A qualitative understanding of the DLTS signal and the observed activation energies is achieved in terms of many-particle states determined by quantization and Coulomb charging. © 2000 American Institute of Physics.
Published in:
Applied Physics Letters
(Volume:77
,
Issue:
25
)
Date of Publication: Dec 2000
- Page(s):
- 4169 - 4171
- ISSN :
- 0003-6951
- Digital Object Identifier :
- 10.1063/1.1334651
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 18 June 2009
- Issue Date :
- Dec 2000
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