Publications

Publications

Droop-Free, Reliable, and High-Power InGaN/GaN Nanowire Light-Emitting Diodes for Monolithic Metal-Optoelectronics

Year: 2016

Authors: Chao Zhao, Tien Khee Ng, Rami T. ElAfandy, Aditya Prabaswara, Giuseppe Bernardo Consiglio, Idris A. Ajia, C. J. Humphreys & I. S. Roqan, Bilal Janjua, Chao Shen, Jessica Eid, Ahmed Y. Alyamani, Munir M. Eldesouki, Boon S. Ooi

Efficiency Droop
Light emitting diodes
Molecular beam epitaxy
Quantum-disks-in-nanowire

A close examination of the structure and dynamics of HC(NH2)2PbI3 by MD simulations and group theory

Year: 2016

Authors: M. A. Carignano, Y. Saeed, Assa Aravindh Sasikalav Devi, C. J. Humphreys & I. S. Roqan, Jacky Even, C. Katan

Perovskite

High-quality III-nitride films on conductive, transparent (201)- oriented β-Ga2O3 using a GaN buffer layer

Year: 2016

Authors: Mufasila Mumthaz Muhammed, M. A. Roldan, Y. Yamashita, S.-L. Sahonta, Idris A. Ajia, K. Lizuka, A. Kuramata, C. J. Humphreys & I. S. Roqan

Inorganic LEDs
Thin Films

The origin of room temperature ferromagnetism mediated by Co-VZn complexes in the ZnO grain boundary

Year: 2016

Authors: Assa Aravindh Sasikalav Devi, Iman Salem Roqan

Dilute Magnetic Semiconductor Materials
Ferromagnetism
ZnO

The magnetic ordering in high magnetoresistance Mn-doped ZnO thin films

Year: 2016

Authors: S. Venkatesh, A. Baras, J.-S. Lee, Iman Salem Roqan

Zinc Oxide Films
Magnetoresistance
Polarons
Percolation

Identifying the influence of the intrinsic defects in Gd-doped ZnO thin-films

Year: 2016

Authors: T. H. Flemban, M. C. Sequeira, Zhenkui Zhang, S. Venkatesh, E. Alves, K. Lorenz, Iman Salem Roqan

Zinc
Zinc Oxide Films
Lattice constants
Doping

Defect-band mediated ferromagnetism in Gd-doped ZnO thin films

Year: 2015

Authors: S. Venkatesh, J. B. Franklin, M. P. Ryan, J.-S. Lee, H. Ohldag, M. A. McLachlan, N. M. Alford, Iman Salem Roqan

Thin Films

Defect induced d0 ferromagnetism in a ZnO grain boundary

Year: 2015

Authors: Assa Aravindh Sasikalav Devi, Udo Schwingenschloegl, Iman Salem Roqan

Zinc
Vacancies
Ferromagnetism
Zinc Oxide Films

Defect-impurity complex induced long-range ferromagnetism in GaN nanowires

Year: 2015

Authors: Assa Aravindh Sasikalav Devi, Iman Salem Roqan

GaN Nanowire
Density Functional Theory
Magnetism
Electronic Structure

Homogeneous vertical ZnO nanorod arrays with high conductivity on an in situ Gd nanolayer

Year: 2015

Authors: Tahani Hassan Flemban, Venkatesh Singaravelu, Assa Aravindh Sasikalav Devi, Iman Salem Roqan

ZnO
Nanorods

−201 β-Gallium oxide substrate for high quality GaN materials

Year: 2015

Authors: Iman Salem Roqan, Mufasila Mumthaz Muhammed

GaN
Ga203
LED
High Efficiency
Optical Properties

Obtaining strong ferromagnetism in diluted Gd-doped ZnO thin films through controlled Gd-defect complexes

Year: 2015

Authors: Iman Salem Roqan, S. Venkatesh, Zhenkui Zhang, S. Hussain, Ioannis Bantounas, J. B. Franklin, T. H. Flemban, B. Zou, J.-S. Lee

Zinc Oxide Films
Doping
Magnetic Films
Zinc

Thin Film growth and characterization of Ti doped ZnO by RF/DC magnetron sputtering

Year: 2014

Authors: M. B. Haider, M. F. Al-Kuhaili, S. M. A. Durrani, S. Venkatesh, Iman Salem Roqan

Ti doped ZnO

Ferromagnetism in Gd doped ZnO nanowires: A first principles study

Year: 2014

Authors: Assa Aravindh, Udo Schwingenschloegl, Iman Salem Roqan

Gd doped ZnO

Structural and magnetic properties of Gd-doped ZnO

Year: 2014

Authors: Ioannis Bantounas, Venkatesh Singaravelu, Iman Salem Roqan, Udo Schwingenschloegl

Gd doped ZnO
Density Functional Theory

Vacancy complexes induce long-range ferromagnetism in GaN

Year: 2014

Authors: Zhenkui Zhang, Udo Schwingenschloegl, Iman Salem Roqan

Vacancies
III-V semiconductors
Ferromagnetism
Density functional
Antiferromagnetism

Possible mechanism for d0 ferromagnetism mediated by intrinsic defects

Year: 2014

Authors: Zhenkui Zhang, Udo Schwingenschloegl, Iman Salem Roqan

Zn vacancies
ZnS Nanostructures
Intrinsic Defects
Density Functional Theory

Excitonic localization in AlN-rich AlxGa1−xN/AlyGa1−yN multi-quantum-well grain boundaries

Year: 2014 ISSN:0003-6951

Authors: Idris A. Ajia, P. R. Edwards, Z. Liu, J.C. Yan, R.W. Martin, Iman Salem Roqan

Multiple Quantum Wells
Grain boundaries
Photoluminescence
Excitons

High optical and structural quality of GaN epilayers grown on

Year: 2014

Authors: Mufasila Mumthaz Muhammed, M. Peres, Y. Yamashita, Y. Morishima, S. Sato, N. Franco, K. Lorenz, A. Kuramata, Iman Salem Roqan

III-V semiconductors
Epitaxy
X-Ray Diffraction
Photoluminescence

Neocellularization and neovascularization of nanosized bioactive glass-coated decellularized trabecular bone scaffolds

Year: 2013

Authors: L-C. Gerhardt, K. L. Widdows, M. M. Erol, A. Nandakumar, Iman Salem Roqan, T. Ansari, A. R. Boccaccini

Decellularized Bone
Scaffold
Bioactive glass
Angiogenesis
Coating
Vascular endothelial growth factor
Stereology
Vascularisation

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