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Amorphous and nanocrystalline luminescent Si and Ge obtained via a solid-state chemical metathesis synthesis route

Amorphous and nanocrystalline luminescent Si and Ge obtained via a solid-state chemical metathesis synthesis route
Amorphous and nanocrystalline luminescent Si and Ge obtained via a solid-state chemical metathesis synthesis route
A new solid-state metathesis synthesis route was applied to obtain bulk samples of amorphous or microcrystalline Si and Ge. The method involves reaction of Zintl phases such as NaSi or NaGe, with ammonium or metal (e.g., CuCl, CoBr2) halides. The driving force for the solid-state reaction is provided by the formation of alkali halides and the transition metals or metal silicides, or gaseous ammonia and hydrogen. The semiconductors were purified by washing to remove other solid products. The amorphous semiconductors were obtained in bulk form from reactions carried out at 200-300 degrees C. Syntheses at higher temperatures gave rise to microcrystalline semiconductors, or to micro-/nanocrystalline particles contained within the amorphous material. Similar crystalline/amorphous composites were obtained after heat treatment of bulk amorphous materials.
silicon quantum dots, a-si, phase-transition, high-pressure, raman-spectroscopy, vapor-deposition, high-temperature, porous silicon, range order, films
0022-4596
937-949
McMillan, Paul F.
8bca9219-06e0-4621-bdae-ad059709a147
Gryko, Jan
f0d90ac3-e139-4dce-9b22-da625c857ca2
Bull, Craig
35af90af-1248-48bc-94c6-e439f93b5e8b
Arledge, Richard
f87797cd-2161-42df-96a5-50d91b9c96bb
Kenyon, Anthony J.
1e816a53-7f8f-4a52-b140-46d7431c64af
Cressey, Barbara A.
70509397-66ab-43e7-ba73-2cde89c368d3
McMillan, Paul F.
8bca9219-06e0-4621-bdae-ad059709a147
Gryko, Jan
f0d90ac3-e139-4dce-9b22-da625c857ca2
Bull, Craig
35af90af-1248-48bc-94c6-e439f93b5e8b
Arledge, Richard
f87797cd-2161-42df-96a5-50d91b9c96bb
Kenyon, Anthony J.
1e816a53-7f8f-4a52-b140-46d7431c64af
Cressey, Barbara A.
70509397-66ab-43e7-ba73-2cde89c368d3

McMillan, Paul F., Gryko, Jan, Bull, Craig, Arledge, Richard, Kenyon, Anthony J. and Cressey, Barbara A. (2005) Amorphous and nanocrystalline luminescent Si and Ge obtained via a solid-state chemical metathesis synthesis route. Journal of Solid State Chemistry, 178 (3), 937-949. (doi:10.1016/j.jssc.2004.12.040).

Record type: Article

Abstract

A new solid-state metathesis synthesis route was applied to obtain bulk samples of amorphous or microcrystalline Si and Ge. The method involves reaction of Zintl phases such as NaSi or NaGe, with ammonium or metal (e.g., CuCl, CoBr2) halides. The driving force for the solid-state reaction is provided by the formation of alkali halides and the transition metals or metal silicides, or gaseous ammonia and hydrogen. The semiconductors were purified by washing to remove other solid products. The amorphous semiconductors were obtained in bulk form from reactions carried out at 200-300 degrees C. Syntheses at higher temperatures gave rise to microcrystalline semiconductors, or to micro-/nanocrystalline particles contained within the amorphous material. Similar crystalline/amorphous composites were obtained after heat treatment of bulk amorphous materials.

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More information

Published date: 1 March 2005
Keywords: silicon quantum dots, a-si, phase-transition, high-pressure, raman-spectroscopy, vapor-deposition, high-temperature, porous silicon, range order, films

Identifiers

Local EPrints ID: 20865
URI: http://eprints.soton.ac.uk/id/eprint/20865
ISSN: 0022-4596
PURE UUID: 7c65aec1-089a-47f1-940d-bba03e022e30

Catalogue record

Date deposited: 02 Mar 2006
Last modified: 15 Jul 2019 19:25

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