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Orientation-controlled growth and optical properties of diverse Ag nanoparticles on Si(100) and Si(111) wafers.
MedLine Citation:
PMID:  23291468     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Well-controlled growth of Ag nanoparticles (NPs) on Si substrates is important for next generation Si-based optoelectronic devices, but only randomly oriented Ag NPs have been previously reported. In this work, well-oriented Ag NPs with regular shapes are pseudomorphically grown on Si(100) and Si(111) substrates with crystallographic relationships of {100}〈010〉Ag ∥ {100}〈010〉Si and {111}〈110〉Ag ∥ {111}〈110〉Si, respectively. From a cross-sectional image, the Ag NPs on Si(100) substrates penetrate into Si and generate an inverted pyramid-like structure terminated by {111} planes embedded in Si substrates. In contrast, the Ag NPs on Si(111) substrates show flat morphology with the top plane terminated by Ag {111}. The Si underneath Ag NPs was not penetrated by Ag and a SiO(2) layer was formed between Ag and Si. Photoluminescence spectra of the Ag NPs show ultraviolet emissions centered in the 340-343 nm range. The 〈111〉-oriented Ag particles show stronger emissions with an extra peak at 343 nm compared with 〈100〉-oriented Ag NPs. Raman spectra show that the 〈100〉- and 〈111〉-oriented Ag NPs can enhance the peak intensity of Si(100) and Si(111) by 45.3% and 32.5%, respectively. The orientation-controlled Ag NPs with anisotropic optical properties are promising materials for Si-based optoelectronics.
Authors:
Ruey-Chi Wang; Yu-Xian Lin; Michael R S Huang; Chien-Yang Chao
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-04
Journal Detail:
Title:  Nanotechnology     Volume:  24     ISSN:  1361-6528     ISO Abbreviation:  Nanotechnology     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-7     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101241272     Medline TA:  Nanotechnology     Country:  -    
Other Details:
Languages:  ENG     Pagination:  045601     Citation Subset:  -    
Affiliation:
Department of Chemical and Materials Engineering, National University of Kaohsiung, Kaohsiung 81148, Taiwan.
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