Strain detection in crystalline heterostructures using bidimensional blocking patterns of channelled particles
authors Redondo-Cubero, A; David-Bosne, E; Wahl, U; Miranda, P; da Silva, MR; Correia, JG; Lorenz, K
nationality International
journal JOURNAL OF PHYSICS D-APPLIED PHYSICS
author keywords ion channelling; strain; RBS; AlInN
keywords LATTICE; TRANSITION
abstract Strain is a critical parameter affecting the growth and the performance of many semiconductor systems but, at the same time, the accurate determination of strain profiles in heterostructures can be challenging, especially at the nanoscale. Ion channelling/blocking is a powerful technique for the detection of the strain state of thin films, normally carried out through angular scans with conventional particle detectors. Here we report the novel application of position sensitive detectors for the evaluation of the strain in a series of AlInN/GaN heterostructures with different compositions and thicknesses. The tetragonal strain is varied from compressive to tensile and analysed through bidimensional blocking patterns. The results demonstrate that strain can be correctly quantified when compared to Monte Carlo channelling simulations, which are essential because of the presence of ion steering effects at the interface between the layer and the substrate. Despite this physical limitation caused by ion steering, our results show that full bidimensional patterns can be applied to detect fingerprints and enhance the accuracy for most critical cases, in which the angular shift associated to the lattice distortion is below the critical angle for channelling.
publisher IOP PUBLISHING LTD
issn 0022-3727
year published 2018
volume 51
issue 11
digital object identifier (doi) 10.1088/1361-6463/aaad8b
web of science category Physics, Applied
subject category Physics
unique article identifier WOS:000425978200003
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journal impact factor 2.373
5 year journal impact factor 2.707
category normalized journal impact factor percentile 63.356
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