NDLI: Laser physical vapor deposition of nanocrystalline dots using nanopore filters

Content Provider	Springer Nature Link
Author	Jagannadham, K. Howe, J. Allard, L. F.
Copyright Year	2009
Abstract	Nanocrystalline dots of n-type Bi2Te2.7Se0.3 thermoelectric compound and of silicon were deposited by laser physical vapor deposition using polycarbonate or alumina nanopore filters as templates. The films were characterized by scanning electron microscopy and transmission electron microscopy. Using a pore size of 0.2 μm in the nanopore filters, a uniform distribution of crystallites with size 3 to 4 nm and separated from each other was observed by high-resolution transmission electron microscopy. The dots were all single crystals, as seen by the resolved crystal lattice planes. The compositions of the crystallites, of both the thermoelectric compound and silicon, were analyzed by energy dispersive X-ray analysis. The composition of the thermoelectric compound nanocrystals differed significantly from that of the bulk target, likely due to vapor pressure differences of the constituent elements. The results are promising for synthesis of nanocrystalline dots with controlled size but compositional control is a different task that is not carried out. The observations illustrate that nonstoichiometry is a result of difference in the vapor pressure of different elements in the compound. The method of synthesis is found to be suitable for deposition of quantum dots below certain size determined by the size of the pores in the porous filter.
Ending Page	292
Page Count	8
Starting Page	285
File Format	PDF
ISSN	09478396
e-ISSN	14320630
Journal	Applied Physics A
Issue Number	2
Volume Number	98
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-10-20
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Condensed Matter Physics Operating Procedures, Materials Treatment Optical and Electronic Materials Characterization and Evaluation of Materials Surfaces and Interfaces, Thin Films Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Science

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