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Semiconductor and Material Spectroscopy Laboratory
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Publications

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Significant internal quantum efficiency enhancement of GaN/AlGaN multiple quantum wells emitting at ~350 nm via step quantum well structure design
Year: 2017
Authors: Feng Wu, Idris A. Ajia, Haiding Sun, Somak Mitra, Daliang Zhang, Jiangnan Dai, Changging Chen, Zhe Chuan Feng, Iman Salem Roqan, Xiaohang Li
  • GaN/AlGaN MQWs
  • Internal Quantum Efficiency
  • Photoluminescence
  • Wave-Function Overlap
Photoinduced entropy of InGaN/GaN p-i-n double-heterostructure nanowires
Year: 2017
Authors: Nasir Alfaraj, Somak Mitra, Feng Wu, Idris A. Ajia, Bilaj Janjua, Aditya Prabaswara, Renad Aljefri, Haiding Sun, Tien Khee Ng, Boon S. Ooi, Iman Salem Roqan, Xiaoha Li
  • InGaN
  • Nanowires
Surface Passivation of III-Nitride Nanowires for Enhanced Photoelectrochemical Water-Splitting
Year: 2017
Authors: Purushothaman Varadhan, Davide Priante, Hui-Chun Fu, Jose Ramon Duran Retamal, Chao Zhao, Mohamed Ebaid, Tien Khee Ng, Idris A. Ajia, Somak Mitra, Iman Salem Roqan, Boon S. Ooi, Jr-Hau He
  • III-Nitrides
  • Nanowires
  • Photoelectrochemical Water-Splitting
  • Solar Fuel
  • Surface Passivation
Double Charged Surface Layers in Lead Halide Perovskite Crystals
Year: 2017
Authors: Mohammed Omar, Sarmah Smritakshi, Burlakov Victor, Yengel Emre, Murali Banavoth, Erkki Alarousu , Chen Yang , Ahmed El-Zohry, Alias Mohd, Ayan Zhumekenov, Makhsud Saidaminov, Cho Namchul, Nimer Wehbe, Somak Mitra, Idris A. Ajia, Dey Sukumar, Mansour Ahmed E.
  • Lead halide Peroviskite Crystals
Nature of low dimensional structural modulations and relative phase stability in RexMo(W)1-xS2 transition metal dichalcogenide alloys
Year: 2017
Authors: Rajib Sahu, Usha Bhat, Nitin M. Batra, Horta Sharona, Badri Vishal, Sumanta Sarkar, Assa Aravindh Sasikalav Devi, Sebastien C. Peter, Iman Salem Roqan, Pedro Costa, Ranjan Datta
  • Dichalcogenidealloys
Epitaxially-grown Gallium Nitride on Gallium Oxide substrate for photon pair generation in visible and telecomm wavelengths
Year: 2016
Authors: K. M. Awan, K. Dolgaleva, M.M. Muhammed, Iman Salem Roqan
  • Nanolinear optics
  • Integrated photonic circuit
  • Four-Wave Mixing
  • All-optical Wavelength Conversion
  • Photon pair Generation
  • GaN epitaxial growth
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
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King Abdullah bin Abdulaziz Al Saud, 1924 – 2015

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