Influence of deposition parameters on the optical absorption of amorphous silicon thin films

Terkowski, L. et al. (2020) Influence of deposition parameters on the optical absorption of amorphous silicon thin films. Physical Review Research, 2(3), 033309. (doi: 10.1103/PhysRevResearch.2.033308)

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Abstract

Amorphous silicon (aSi) is a promising material for application in mirror coatings with low thermal noise in future gravitational-wave detectors. However, the optical absorption of aSi is currently too high to meet the requirements of these instruments. Previously measured absorption values vary significantly for different deposition methods and postdeposition treatments. To investigate the absorption of aSi, we systematically varied key deposition parameters using pulsed laser deposition. Varying the deposition temperature resulted in a spread in mobility gap energy of the aSi; however, no clear correlation of temperature and mobility gap could be observed. Varying the pulse energy and repetition frequency altered the deposition rate of the coating and produced a correlated change in the absorption.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Rowan, Professor Sheila and Bassiri, Mr Riccardo and Bell, Dr Angus and Martin, Dr Iain and Steinlechner, Dr Jessica and Hough, Professor James
Authors: Terkowski, L., Martin, I. W., Axmann, D., Behrendsen, M., Pein, F., Bell, A., Schnabel, R., Bassiri, R., Fejer, M. M., Hough, J., Markosyan, A., Rowan, S., and Steinlechner, J.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review Research
Publisher:American Physical Society
ISSN:2643-1564
ISSN (Online):2643-1564
Published Online:26 August 2020
Copyright Holders:Copyright © 2021 American Physical Society
First Published:First published in Physical Review Research 2(3): 033309
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
173808Investigations in gravitational radiationSheila RowanScience and Technology Facilities Council (STFC)ST/N005422/1P&S - Physics & Astronomy
166497Optical characterisation of silicon and mirror materials for gravitational astronomy.Iain MartinThe Royal Society (ROYSOC)RG110331P&S - Physics & Astronomy