Change search
ReferencesLink to record
Permanent link

Direct link
Atomic structure of amorphous nanosized silicon powders upon thermal treatment
1996 (English)In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 54, no 4, 2856-2862 p.Article in journal (Refereed) PublishedText
Abstract [en]

Amorphous silicon powders prepared by plasma-enhanced chemical vapor deposition, of 8-24-nm-sized particles agglomerated into larger aggregates were annealed in a reducing atmosphere to study the phase transformation behavior of these particles. High-resolution electron microscopy revealed a very rough surface, with structural details of 1 to 2 nm, of the as-prepared single powder particles. Upon l h annealing at temperatures between 300 and 600 °C circular contrast features, 1.5-2.5 nm in size, are observed in the amorphous particles, hinting to the formation of a medium-range order. A distinct onset of crystallization is achieved at 700 °C, with structures ranging from very small crystalline ordered regions of 2.5-3.5 nm in size, to fast-grown multiply twinned crystallites. Rapid progress of crystallization, mainly caused by growth twinning, is observed upon annealing at 800 °C. At 900 °C, almost completely crystalline particles are formed. The particles having lattice characteristics of diamond cubic silicon frequently exhibit a faulted structure, because of multiple twinning events. They are covered by an amorphous oxide shell of a 1.5 to 2 nm thickness, which is found to develop with the onset of crystallization. Size and surface roughness of the as-prepared powders are widely preserved throughout all stages of heating, and practically no sintering occurs up to 900 °C.

Place, publisher, year, edition, pages
1996. Vol. 54, no 4, 2856-2862 p.
National Category
Nano Technology
Identifiers
URN: urn:nbn:se:kth:diva-182945ScopusID: 2-s2.0-0000148534OAI: oai:DiVA.org:kth-182945DiVA: diva2:918272
Note

NR 20160422

Available from: 2016-04-11 Created: 2016-02-24 Last updated: 2016-04-22Bibliographically approved

Open Access in DiVA

No full text

Other links

Scopushttp://dx.doi.org/10.1103/PhysRevB.54.2856

Search in DiVA

By author/editor
Dutta, J.
In the same journal
Physical Review B Condensed Matter
Nano Technology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 16 hits
ReferencesLink to record
Permanent link

Direct link