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Pulsed Laser Deposition of Silicon Nanostructures

Published online by Cambridge University Press:  21 September 2011

P. Bruno ,
T. Salve ,
V. Russo ,
D. Dellasega ,
G. Filoni ,
C.S. Casari ,
C.E. Bottani  and
A. Li Bassi
P. Bruno
Affiliation:
Center for Nano Science and Technology –IIT@PoliMI, via Pascoli 70/3, 20133 Milano, Italy.
T. Salve
Affiliation:
Dipartimento di Energia and NEMAS – Center for NanoEngineered MAterials and Surfaces, Politecnico di Milano, via Ponzio 34/3, 20133 Milano, Italy.
V. Russo
Affiliation:
Dipartimento di Energia and NEMAS – Center for NanoEngineered MAterials and Surfaces, Politecnico di Milano, via Ponzio 34/3, 20133 Milano, Italy.
D. Dellasega
Affiliation:
Dipartimento di Energia and NEMAS – Center for NanoEngineered MAterials and Surfaces, Politecnico di Milano, via Ponzio 34/3, 20133 Milano, Italy.
G. Filoni
Affiliation:
Dipartimento di Energia and NEMAS – Center for NanoEngineered MAterials and Surfaces, Politecnico di Milano, via Ponzio 34/3, 20133 Milano, Italy.
C.S. Casari
Affiliation:
Center for Nano Science and Technology –IIT@PoliMI, via Pascoli 70/3, 20133 Milano, Italy. Dipartimento di Energia and NEMAS – Center for NanoEngineered MAterials and Surfaces, Politecnico di Milano, via Ponzio 34/3, 20133 Milano, Italy.
C.E. Bottani
Affiliation:
Center for Nano Science and Technology –IIT@PoliMI, via Pascoli 70/3, 20133 Milano, Italy. Dipartimento di Energia and NEMAS – Center for NanoEngineered MAterials and Surfaces, Politecnico di Milano, via Ponzio 34/3, 20133 Milano, Italy.
A. Li Bassi
Affiliation:
Center for Nano Science and Technology –IIT@PoliMI, via Pascoli 70/3, 20133 Milano, Italy. Dipartimento di Energia and NEMAS – Center for NanoEngineered MAterials and Surfaces, Politecnico di Milano, via Ponzio 34/3, 20133 Milano, Italy.
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Abstract

Silicon nanostructures embedded in an amorphous matrix have been synthesized by Pulsed Laser Deposition (PLD) at room temperature. The structural and optical properties of the materials were tailored by varying deposition parameters; attention has been devoted to the nanoscale morphology of the Si layers which has been varied from compact to open-porous by changing background gas (Ar) pressure (1-100 Pa). An adopted simple-minded strategy of a compact Si layer deposited on top of nanostructured layers showed to reduce quite successfully ex-situ oxidation. Raman spectroscopy suggests that as deposited samples are mainly constituted by amorphous silicon with nanocrystals (NCs) inclusions. The results indicate that the average size of the Si NCs varies in the range 2-6 nm. Photoluminescence (PL) responses are found to be strictly dependent on morphology and strengthen up the idea of the quantum confinement effect in the obtained nanostructured material. The results are interpreted in terms of particle size distribution, crystallinity and partial surface oxidation of the silicon nanostructures.

Keywords

Sinanostructureoptical properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1322: Symposium B – Third-Generation and Emerging Solar-Cell Technologies , 2011 , mrss11-1322-b05-34
Copyright
Copyright © Materials Research Society 2011

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References

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