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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 2 — Jan. 17, 2011
  • pp: 896–905

Spatially confined synthesis of SiOx nano-rod with size-controlled Si quantum dots in nano-porous anodic aluminum oxide membrane

Yi-Hao Pai and Gong-Ru Lin  »View Author Affiliations


Optics Express, Vol. 19, Issue 2, pp. 896-905 (2011)
http://dx.doi.org/10.1364/OE.19.000896


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Abstract

By depositing Si-rich SiOx nano-rod in nano-porous anodic aluminum oxide (AAO) membrane using PECVD, the spatially confined synthesis of Si quantum-dots (Si-QDs) with ultra-bright photoluminescence spectra are demonstrated after low-temperature annealing. Spatially confined SiOx nano-rod in nano-porous AAO membrane greatly increases the density of nucleated positions for Si-QD precursors, which essentially impedes the route of thermally diffused Si atoms and confines the degree of atomic self-aggregation. The diffusion controlled growth mechanism is employed to determine the activation energy of 6.284 kJ mole−1 and diffusion length of 2.84 nm for SiO1.5 nano-rod in nano-porous AAO membrane. HRTEM results verify that the reduced geometric dimension of the SiOx host matrix effectively constrain the buried Si-QD size at even lower annealing temperature. The spatially confined synthesis of Si-QD essentially contributes the intense PL with its spectral linewidth shrinking from 210 to 140 nm and its peak intensity enhancing by two orders of magnitude, corresponding to the reduction on both the average Si-QD size and its standard deviation from 2.6 to 2.0 nm and from 25% to 12.5%, respectively. The red-shifted PL wavelength of the Si-QD reveals an inverse exponential trend with increasing temperature of annealing, which is in good agree with the Si-QD size simulation via the atomic diffusion theory.

© 2011 OSA

OCIS Codes
(250.5230) Optoelectronics : Photoluminescence
(310.1860) Thin films : Deposition and fabrication
(160.4236) Materials : Nanomaterials

ToC Category:
Optoelectronics

History
Original Manuscript: July 23, 2010
Revised Manuscript: August 13, 2010
Manuscript Accepted: August 14, 2010
Published: January 7, 2011

Citation
Yi-Hao Pai and Gong-Ru Lin, "Spatially confined synthesis of SiOx nano-rod with size-controlled Si quantum dots in nano-porous anodic aluminum oxide membrane," Opt. Express 19, 896-905 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-2-896


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