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Semiconductor and Material Spectroscopy Laboratory
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2021

  1. Publications
  • Clear filters
Scalable integration of periodically aligned 2D-MoS2 nanoribbon array
Year: 2018
Authors: Yusin Pak, Yonghum Kim, N. Lim, J-W Min, Woojin Park, W. Kim, Y. Jeong, H. Kim, Somak Mitra, B. Xin, T-W Kim, Iman Salem Roqan, Byungjin Cho, Gun-Young Jung, K. Kim
  • Two-dimensional (2D) Molybdenum Disulfide
GaN/AlGaN multiple quantum wells grown on transparent and conductive −201-oriented β-Ga2O3 substrate for UV vertical light emitting devices
Year: 2018
Authors: Idris A. Ajia, Y. Yamashita, K. Lorenz, M.M. Muhammed, L. Spasevski, D. Almalawi, Jian Xu, K. Lizuka, Y. Morishima, DH Anjum, N. Wei, R.W. Martin, A. Kuramata, Iman Salem Roqan
  • III-nitride semiconductors
Freestanding patterned polycrystalline GaN substrate by a straightforward and affordable technique
Year: 2018
Authors: N. Zainal, MEA Samsudin, Muhamad Ikram Md Taib, MA. Ahmad, A. Ariff, N. Alwadai, Iman Salem Roqan
  • GaN
​Analysis on the energetics, magnetism and electronic properties in a 45° ZnO grain boundary doped with Gd
Year: 2018
Authors: Assa Aravindh, Iman Salem Roqan
  • Magnetism
  • ZnO
High-performance solar-blind flexible deep-UV photodetectors based on quantum dots synthesized by femtosecond-laser ablation
Year: 2018
Authors: Somak Mitra, Assa Aravindh, Gobind Das, Yusin Pak, Idris A. Ajia, Kalaivanan Loganathan, Enzo Di Fabrizio, Iman Salem Roqan
  • Deep-Ultraviolet DUV
  • Femtosecond-laser ablation in liquid
  • Flexible photodetector
  • Quantum dots QDs
  • ZnO Zinc nitride
Carrier dynamics of InxGa1-xN/GaN multiple quantum wells grown on (−201) β-Ga2O3 for bright vertical light emitting diodes
Year: 2018
Authors: Mufasila Mumthaz Muhammed, Jian Xu, Nimer Wehbe, Iman Salem Roqan
  • Optoelectronics
  • Spectroscopy
  • Time-resolved
  • Multiple Quantum Well
Surface-Passivated AlGaN Nanowires for Enhanced Luminescence of Ultraviolet Light Emitting Diodes
Year: 2018
Authors: Haiding Sun, Mohammad Khaled Shakfa, Mufasila Mumthaz Muhammed, Bilaj Janjua, Kuang-Hui Li, Ronghui Lin, Tien Khee Ng, Iman Salem Roqan, Boon S. Ooi, Xiaohang Li
  • Aluminum Gallium Nitride Nanowire
  • passivation
  • Potassium Hydroxide
  • Surface Oxides and States
  • Surface Recombination
  • Ultraviolet Light Emitting Diode
Fabrication and optical characterization of GaN waveguides on −201 -oriented b Ga2O3
Year: 2018
Authors: Ashif M. Awan, M.M. Muhammed, Madhavi Sivan, Spencer Bonca, Iman Salem Roqan, Ksenia Dolgaleva
  • GaN
Generated carrier dynamics in V-pit enhanced InGaN/GaN light emitting diode
Year: 2018
Authors: Idris A. Ajia, E. Belekov, M. A. Roldan, N. Wei, Z. Liu, Iman Salem Roqan
  • Carrier Dynamics
  • Efficiency Droop
  • InGaN
  • Light-Emitting Diode
  • Time-resolved Spectroscopy
Enhanced Performance of MoS2 Photodetectors by Inserting a ALD-Processed TiO2 Interlayer
Year: 2018
Authors: Yusin Pak, Woojin Park, Somak Mitra, Assa Aravindh Sasikalav Devi, Kalaivanan Loganathan, Kumaresan Yogeenth, Yonghum Kim, Byungjin Cho, Gun-Young Jung, Muhammad M. Hussain, Iman Salem Roqan
  • Atomic Layer Deposition
  • Interlayer
  • Molybdenum Disulfide
  • Photodetectors
  • Titanium Dioxide
“Fabrication of rare earth doped ZnO NR /perovskite photodetector on flexible metal sheet"
Year: 2017
Authors: Iman Salem Roqan, Norah Alwadai, Somak Mitra
  • Perovskite
“High Metal-Oxide nanoparticles based optical materials synthesised by ultrafast laser ablation and scaling up procedure for optoelectronic device fabrication"
Year: 2017
Authors: Somak Mitra, Iman Salem Roqan, Yusin Pak
  • Nanoparticles
A Photodetector based on p-Si/n-ZnO Nanotube Heterojunctions with High Ultraviolet Responsivity
Year: 2017
Authors: Tahani Hassan Flemban, Md. Azimul Haque, Idris A. Ajia, Norah Alwadai, Somak Mitra, Tom Wu, Iman Salem Roqan
  • Photodetectors
  • Oxides
  • Time-resolved Measurements
  • Nanotubes
  • Heterojunctions
  • Ultraviolet
  • Pulsed Laser Depositions
High-Efficiency InGaN/GaN Quantum Well-Based Vertical Light-Emitting Diodes Fabricated on β-Ga2O3 Substrate
Year: 2017
Authors: Mufasila Mumthaz Muhammed, Norah Alwadai, Sergei Lopatin, Akito Kuramata, Iman Salem Roqan
  • Vertical Light Emitting Diode
  • Electroluminescence
  • Time-resolved Photoluminescence
  • Gallium Oxide
  • Scanning Transmission Electron Microscopy
Critical Fluctuations and Anharmonicity in Lead Iodide Perovskites from Molecular Dynamics Supercell Simulations
Year: 2017
Authors: Marcelo A. Carignano, Assa Aravindh, Iman Salem Roqan, Jacky Even, Claudine Katan
  • Perovskite
Beyond Perovskites: Quantum Luminescence from Bulk Cs4PbBr6 Single Crystals
Year: 2017
Authors: Michele De Bastiani, Ibrahim Dursun, Buthainah Alshankiti, Xiao-He Miao, Jun Yin, Yengel Emre, Erkki Alarousu , Bekir Turedi, Yuhai Zhang, Jawaher Almutlaq, Makhsud Saidaminov, Somak Mitra, Iman Salem Roqan, Jean-Luc Bredas, Mohammed Omar, Osman Bakr
  • Perovskite
High-Performance Ultraviolet-to-Infrared Broadband Perovskite Photodetectors Achieved via Inter-/Intraband Transitionsmarcelo
Year: 2017
Authors: Norah Alwadai, Md. Azimul Haque, Somak Mitra, Tahani Hassan Flemban, Yusin Pak, Tom Wu, Iman Salem Roqan
  • Perovskite
  • ZnO
  • Metal Substrate
  • Intaband Absorption
  • Infared Detection
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
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