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Issue 28, 2019
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Core properties and the role of screw dislocations in the bulk n-type conductivity in InN

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Abstract

First principles calculations, based on density functional theory, have been carried out to investigate the role of screw dislocations in the bulk n-type conductivity which is usually observed in indium nitride. Energetics, atomic and electronic structures of different core configurations of dislocations, running along the [0001] polar or along the [11[2 with combining macron]0] non-polar direction, have been determined and compared. This enabled inspection of the modifications in the properties of screw dislocations when the growth direction is changed. For the c-type screw dislocation, the configuration with a double 6-atom ring, involving wrong bonds was revealed as a ground state configuration, and for the a-type screw dislocation, the shuffle configuration was found to be energetically favoured over glide ones. Unlike core configurations of the a-type screw dislocation, those of the c-type screw dislocation have their Fermi levels pinned in the conduction band and thus act as a source of non-intentional n-type conductivity. This demonstrates that eliminating the contribution of screw dislocations to the n-type conductivity can be achieved by growing wurtzite InN along the non-polar direction.

Graphical abstract: Core properties and the role of screw dislocations in the bulk n-type conductivity in InN

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Publication details

The article was received on 12 Apr 2019, accepted on 01 Jul 2019 and first published on 01 Jul 2019


Article type: Paper
DOI: 10.1039/C9CP02062D
Phys. Chem. Chem. Phys., 2019,21, 15767-15778

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    Core properties and the role of screw dislocations in the bulk n-type conductivity in InN

    I. Belabbas, L. Pizzagalli, J. Kioseoglou and J. Chen, Phys. Chem. Chem. Phys., 2019, 21, 15767
    DOI: 10.1039/C9CP02062D

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