Mechanistic details of the formation and growth of nanoscale voids in Ge under extreme conditions within an ion track

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Hooda , S , Avchachov , K , Khan , S A , Djurabekova , F , Satpati , B , Nordlund , K , Bernstorff , S , Ahlawat , S , Kanjilal , D & Kabiraj , D 2017 , ' Mechanistic details of the formation and growth of nanoscale voids in Ge under extreme conditions within an ion track ' , Journal of Physics. D, Applied Physics , vol. 50 , no. 22 , 225302 . https://doi.org/10.1088/1361-6463/aa6e25

Title: Mechanistic details of the formation and growth of nanoscale voids in Ge under extreme conditions within an ion track
Author: Hooda, Sonu; Avchachov, Konstantin; Khan, S. A.; Djurabekova, Flyura; Satpati, B.; Nordlund, Kai; Bernstorff, Sigrid; Ahlawat, Sarita; Kanjilal, D.; Kabiraj, D.
Other contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics

Date: 2017-06-07
Language: eng
Number of pages: 8
Belongs to series: Journal of Physics. D, Applied Physics
ISSN: 0022-3727
DOI: https://doi.org/10.1088/1361-6463/aa6e25
URI: http://hdl.handle.net/10138/308772
Abstract: The formation of nanoscale voids in amorphous-germanium (a-Ge), and their size and shape evolution under ultra-fast thermal spikes within an ion track of swift heavy ion, is meticulously expatiated using experimental and theoretical approaches. Two step energetic ion irradiation processes were used to fabricate novel and distinct embedded nanovoids within bulk Ge. The 'bow-tie' shape of voids formed in a single ion track tends to attain a spherical shape as the ion tracks overlap at a fluence of about 1 x 10(12) ions cm(-2). The void assumes a prolate spheroid shape with major axis along the ion trajectory at sufficiently high ion fluences. Small angle x-ray scattering can provide complementary information about the primary stage of void formation hence this technique is applied for monitoring simultaneously their formation and growth dynamics. The results are supported by the investigation of cross-sectional transmission and scanning electron micrographs. The multi-time-scale theoretical approach corroborates the experimental findings and relates the bow-tie shape void formation to density variations as a result of melting and resolidification of Ge within the region of thermal spike generated along an ion track, plus non-isotropic stresses generated towards the end of the thermal spike.
Subject: germanium
voids
ion track
molecular dynamics
GISAXS
THIN-FILM
GERMANIUM
SEMICONDUCTORS
SILICON
IRRADIATION
KINETICS
METALS
114 Physical sciences
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