Surface control of luminescence in silicon nanoparticles
作者:
A. A. Seraphin,
S.‐T. Ngiam,
K. D. Kolenbrander,
期刊:
Journal of Applied Physics
(AIP Available online 1996)
卷期:
Volume 80,
issue 11
页码: 6429-6433
ISSN:0021-8979
年代: 1996
DOI:10.1063/1.363662
出版商: AIP
数据来源: AIP
摘要:
The intensity of visible photoluminescence from thin films of silicon nanoparticles is shown to be dependent upon the degree of surface passivation on the nanoparticles, while the emission energy is independent of the specific chemical nature of the passivating species. Nanoparticles are deposited into films using a pulsed laser ablation supersonic expansion source. Surface chemistry is controlled with a variety of postdeposition processing steps, including acid, methanol, and iodine treatments. These steps are then correlated with the visible photoluminescence behavior of the sample and the surface chemistry as characterized by x‐ray photoelectron spectroscopy. Surface passivation controls the emission intensity through the elimination of competing nonradiative carrier relaxation pathways. The chemical nature of the passivating species does not determine the emission energy and can be easily changed with no anomalous photoluminescence behavior resulting. All results are consistent with a simple quantum confinement model of emission where particle size determines emission energy and surface passivation determines emission intensity. ©1996 American Institute of Physics.
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