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Semiconductor and Material Spectroscopy Laboratory
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Publications

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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
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
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