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Carriers Multiplication in Neighboring Surfactant-free Silicon Nanocrystals Produced by 3D-surface Engineering in Liquid Medium

Svrcek, V, Mariotti, D, Matsubara, K and Kondo, M (2012) Carriers Multiplication in Neighboring Surfactant-free Silicon Nanocrystals Produced by 3D-surface Engineering in Liquid Medium. In: THE 38th IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE. IEEE. 4 pp. [Conference contribution]

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Abstract

Carriers multiplication in silicon nanocrystals (Si-ncs) in a one promising eefect to considerably enhance conversion efficiency of solar cells that can overcome theoretical limits. A close proximity of Si-ncs is an essential factor for carrier multiplication due to the separated quantum cutting effect. In this study we present results on investigation of 3-dimensional (3D) surface engineering of Si-ncs directly in water. Thus at the same time allow close proximity Si-ncs without of using any surfactant. The approach is based on ns laser treatment of Si-ncs dispersed in liquid solution. We explore the excitation wavelength dependence of photoluminescence quantum yield (ratio of the number of emitted and absorbed photons) for Si-ncs as prepared and surface engineered by ns laser processing. Our results suggest that close proximity of Si-ncs in spherical particles induced by laser processing might enhance also carriers multiplication.

Item Type:Conference contribution (Paper)
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:24774
Deposited By: Professor Davide Mariotti
Deposited On:29 Jan 2013 10:25
Last Modified:09 Dec 2015 11:10

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