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On the origin of the 2.2-2.3 eV photoluminescence from chemically etched germanium

Kartopu, G, Bayliss, SC, Sapelkin, AV, Karavanskii, VA, Curry, RJ and Turan, R (2003) On the origin of the 2.2-2.3 eV photoluminescence from chemically etched germanium Journal of Luminescence, 101 (4). pp. 275-283.

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Abstract

The photoluminescence (PL) at ∼2.2-2.3eV from Ge-based nanocrystalline materials is described in the literature as nanocrystal size-independent. We have observed visible luminescence from two different types of stain-etched Ge samples, one prepared after Sendova-Vassileva et al. (Thin Solid Films 255 (1995) 282) in a solution of HO:HF at 50:1 volume ratio, and the other in a solution of HF:HPO:HO at 34:17:1 volume ratio. Energy dispersive X-ray analysis (EDX), Raman and FTIR spectroscopy, and the near edge X-ray absorption structure (XANES), indicate that the chemically etched Ge layers of the former type of samples are composed of non-stoichometric Ge oxides, i.e. GeO (0<x<2), and free from any Ge nanoconstructions. It is also suggested from XANES that the latter type of chemically etched Ge samples comprise 8-9nm nanocrystals of Ge, surface-covered with mainly oxygen. Photoluminescence occurred at ∼2.3eV for all samples. The PL behavior of the latter type of chemically etched Ge on annealing in different chemical environments (air or H) allowed us to conclude that the PL from these materials, as well as that from those Ge-based nanocrystalline materials reported in the literature, is from GeOs. © 2002 Elsevier Science B.V. All rights reserved.

Item Type: Article
Authors :
NameEmailORCID
Kartopu, GUNSPECIFIEDUNSPECIFIED
Bayliss, SCUNSPECIFIEDUNSPECIFIED
Sapelkin, AVUNSPECIFIEDUNSPECIFIED
Karavanskii, VAUNSPECIFIEDUNSPECIFIED
Curry, RJUNSPECIFIEDUNSPECIFIED
Turan, RUNSPECIFIEDUNSPECIFIED
Date : April 2003
Identification Number : 10.1016/S0022-2313(02)00570-7
Additional Information : Please replace your uploaded file with the 'author's version' - this is the final peer-reviewed version of the paper as accepted in final form but before typesetting/formatting by the publisher.
Depositing User : Symplectic Elements
Date Deposited : 28 Mar 2017 13:10
Last Modified : 31 Oct 2017 16:41
URI: http://epubs.surrey.ac.uk/id/eprint/805362

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