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Browsing Research Articles (Physics) by UP Author "Igumbor, Emmanuel"

Now showing items 1-18 of 18

Ab initio study of aluminium impurity and interstitial-substitutional complexes in Ge using a hybrid functional (HSE)

Igumbor, Emmanuel; Mapasha, Refilwe Edwin; Meyer, Walter Ernst (Springer, 2017-07)

The results of an ab initio modelling of aluminium substitutional impurity (AlGe), aluminium interstitial in Ge [IAl for the tetrahedral (T) and hexagonal (H) configurations] and aluminium interstitial-substitutional ...
Ab Initio study of MgTe self-interstitial (Mgi and Tei) : a wide band gap semiconductor

Igumbor, Emmanuel; Omotoso, Ezekiel; Meyer, Walter Ernst (Trans Tech Publications, 2017-06)

We present results of defect formation energies and charge state thermodynamic transition levels of Mg and Te interstitials in MgTe wurzite structure. We use the generalized gradient approximation and local density ...
Ab-initio study of germanium di-interstitial using a hybrid functional (HSE)

Igumbor, Emmanuel; Ouma, C.N.M.; Webb, Geoffrey; Meyer, Walter Ernst (Elsevier, 2016-01)

In this work, we present ab-initio calculation results of Ge di-interstitials (I2(Ge)) in the framework of the density functional theory (DFT) using the Heyd, Scuseria, and Ernzerhof (HSE) hybrid functional. The formation ...
Ab-initio study of MgSe self-interstitial (Mgi and Sei)

Igumbor, Emmanuel; Obodo, Kingsley Onyebuchi; Meyer, Walter Ernst (Trans Tech Publications, 2016)

We present detailed calculations of formation and thermodynamics transition state energies of Mgi and Sei interstitial defects in MgSe using generalized gradient approximation (GGA) and local density approximation (LDA) ...
Ab-initio study of the optical properties of beryllium-sulphur co-doped graphene

Olaniyan, Okikiola; Igumbor, Emmanuel; Khaleed, Abubakar A.; Mirghni, Abdulmajid Abdallah; Manyala, Ncholu I. (American Institute of Physics, 2019)

Graphene is a carbon material with excellent properties, which makes it applicable in a myriad of applications. However, the range of the applications of graphene can be extended to the developing field of nanoelectronics ...
Barrier height inhomogeneities on Pd/n-4H-SiC Schottky diodes in a wide temperature range

Gora, Valentine Elifas; Auret, Francois Danie; Danga, Helga Tariro; Tunhuma, Shandirai Malven; Nyamhere, Cloud; Igumbor, Emmanuel; Chawanda, Albert (Elsevier, 2019-08)

Please read abstract in the article.
Defect levels induced by double substitution of B and N in 4H-SiC

Igumbor, Emmanuel; Danga, Helga Tariro; Omotoso, Ezekiel; Meyer, Walter Ernst (Elsevier, 2019-03)

Please read abstract in the article.
Density functional theory calculation of monolayer WTe2 transition metal dichalcogenides doped with H, Li and Be

Igumbor, Emmanuel; Mapasha, Refilwe Edwin; Meyer, Walter Ernst (Elsevier, 2018-04)

Please read abstract in the article.
The effects of high-energy proton irradiation on the electrical characteristics of Au/Ni/4H-SiC Schottky barrier diodes

Omotoso, Ezekiel; Meyer, Walter Ernst; Janse van Rensburg, Pieter Johan; Igumbor, Emmanuel; Tunhuma, Shandirai Malven; Ngoepe, Phuti Ngako Mahloka; Danga, Helga Tariro; Auret, Francois Danie (Elsevier, 2017-10)

Please read abstract in the article.
Electrical characterization of defects induced by electron beam exposure in low doped n-GaAs

Tunhuma, Shandirai Malven; Auret, Francois Danie; Nel, Jacqueline Margot; Omotoso, Ezekiel; Danga, Helga Tariro; Igumbor, Emmanuel; Diale, M. (Mmantsae Moche) (Elsevier, 2017-10)

We have used deep level transient spectroscopy (DLTS) and Laplace DLTS (L-DLTS) to characterize the electrically active point defects introduced in n-type gallium arsenide by electron beam exposure prior to Schottky ...
Electrically active induced energy levels and metastability of B and N vacancy-complexes in 4H-SiC

Igumbor, Emmanuel; Olaniyan, Okikiola; Mapasha, Refilwe Edwin; Danga, Helga Tariro; Omotoso, Ezekiel; Meyer, Walter Ernst (IOP Publishing, 2018-04)

Please read abstract in the article.
Electronic properties of B and Al doped graphane : a hybrid density functional study

Mapasha, Refilwe Edwin; Igumbor, Emmanuel; Andriambelaza, Noeliarinala Felana; Chetty, Nithaya (Elsevier, 2018-04)

Please read abstract in the article.
A first principle hybrid functional calculation of TmGe 3+-VGe defect complexes in germanium

Igumbor, Emmanuel; Mapasha, Refilwe Edwin; Andrew, Richard Charles; Meyer, Walter Ernst (Elsevier, 2016-09)

By means of density functional theory (DFT), using the screened Heyd, Scuseria, and Ernzerhof (HSE06) hybrid functional we present results of the Tm3+Ge-VGe defect complexes in germanium (Ge). The formation energies of ...
A hybrid functional calculation of Tm3+ defects in germanium (Ge)

Igumbor, Emmanuel; Meyer, Walter Ernst (Elsevier, 2016-03)

Please read abstract in the article.
Induced defect levels of P and Al vacancy-complexes in 4H-SiC : a hybrid functional study

Igumbor, Emmanuel; Olaniyan, Okikiola; Mapasha, Refilwe Edwin; Danga, Helga Tariro; Omotoso, Ezekiel; Meyer, Walter Ernst (Elsevier, 2019-01)

Please read abstract in the article.
Rare earth interstitial-complexes in Ge : hybrid density functional studies

Igumbor, Emmanuel; Omotoso, Ezekiel; Danga, Helga Tariro; Tunhuma, Shandirai Malven; Meyer, Walter Ernst (Elsevier, 2017-10)

Please read abstract in the article.
Rare earth interstitials in Ge : a hybrid density functional theory study

Igumbor, Emmanuel; Andrew, Richard Charles; Meyer, Walter Ernst (Springer, 2017-02)

In this work, the results of density functional theory calculations for rare earth (Ce, Pr, Eu, and Er) interstitials in Ge are presented. We employed the hybrid functional of Heyd, Scuseria, and Ernzerhof (HSE06) for ...
Rare earth substitutional impurities in germanium : a hybrid density functional theory study

Igumbor, Emmanuel; Omotoso, Ezekiel; Tunhuma, Shandirai Malven; Danga, Helga Tariro; Meyer, Walter Ernst (Elsevier, 2017-10)

Please read abstract in the article.

Now showing items 1-18 of 18

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Browsing Research Articles (Physics) by UP Author "Igumbor, Emmanuel"

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