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

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 [1120] 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. © the Owner Societies.
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Submitted on : Wednesday, September 4, 2019 - 2:51:31 PM
Last modification on : Wednesday, November 3, 2021 - 7:21:30 AM

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I. Belabbas, Laurent Pizzagalli, J. Kioseoglou, Jie Chen. Core properties and the role of screw dislocations in the bulk n-type conductivity in InN. Physical Chemistry Chemical Physics, Royal Society of Chemistry, 2019, 21 (28), pp.15767-15778. ⟨10.1039/c9cp02062d⟩. ⟨hal-02278629⟩

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