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Date of Joining: 1997-05-21
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Academic Qualifications  
Courses Taught:
  • Quantum Mechanics-I
  • Statistical Mechanics
Area of Interest/Specialization : Semiconductor nanostructure, Resistive Random Access Memory, High-k for CMOS Technology, ,Perovskite Solar Cell,
Administrative Positions: Dean (RC), HOD Physics (2011 to 2013), Ex Warden (2009-2012) Faculty In-Charge Central Library, NIT Silchar (2008-2009), Registrar(i/c) 01.01.2020 to 31.12.2020
Biographical Sketch : Academic Ph D -IIT Kharagpur Professional Assistant Professor NIT Silchar, Silchar Assam, India. Reviewer Journal of Applied Physics (AIP) Sponsored Research Project Study of Bi-Layered Pervoskite oxides: Thin films for non-volatile ferroelectric memory applications (AICTE) Rs. 17.50 lakhs, 2011 in progress Investigation of some binary metal oxide materials for resistive switching memory applications (AICTE) Rs. 21.00 lakhs, 2011 in progress Modernization of thin film laboratory (AICTE) Rs. 10.00 lakhs 2012Visits AboardCambridge University, Cambridge, UK (Conference “ISIF 2011”) San Juan, Puerto Rico, USA (Conference “ISIF 2011”)
Ph.D. Scholars Guided: 05 ( Five) Completed)  and 03 (three) undergoing Past Ph D students 1. Dr. Nandini Roy, Assistant Professor, B. Borooah College, Guwahati. 2. Dr. Madhuchhanda Nath, currently at NIT Silchar Technical Assistant. 3. Dr. Pranab Kumar Sarkar, Assistant Professor, Assam University. 4. Dr. Snigdha Bhattacharjee, current faculty at Karimganj Polytechnic.       (Undergoing).5. Ujjal Das Post Doc at Institute of Nano Science and Technology, Mohali.
Journals (International):
  1. Ujjal Das, Snigdha Bhattacharjee, Pranab Kumar Sarkar, Asim Roy, A multi-level bipolar memristive device based on visible light sensing MoS2 thin film, Materials Research Express, 2019
  2. Ujjal Das, Snigdha Bhattacharjee, Barnali Mahato, Manoj Prajapat, Pranab Sarkar, Asim Roy, Uniform, large-scale growth of WS2 nanodomains via CVD technique for stable non-volatile RRAM application,Materials Science in Semiconductor Processing, 2020
  3. Ujjal Das, Anupriya Nyayban, Bappi Paul, Arabinda Barman, Pranab Sarkar, Asim Roy, Compliance Current-Dependent Dual-Functional Bipolar and Threshold Resistive Switching in All-Inorganic Rubidium Lead-Bromide Perovskite-Based Flexible Device, ACS Applied Electronic Materials, 2020
  4. Abubakkar Siddik, Prabir Kumar Haldar, Prabir Garu, Snigdha Bhattacharjee, Ujjal Das, Arabinda Barman, Asim Roy, Pranab Kumar Sarkar, Enhancement of data storage capability in a bilayer oxide-based memristor for wearable electronic applications,Journal of Physics D: Applied Physics, 2020
  5. Ujjal Das, Dip Das, Bappi Paul, Tridip Rabha, Soumya Pattanayak, Aloke Kanjilal, Snigdha Bhattacharjee, Pranab Sarkar, Asim Roy, Induced Vacancy-Assisted Filamentary Resistive Switching Device Based on RbPbI3–xClx Perovskite for RRAM Application, ACS Applied Materials & Interfaces, 2020
  6. Abubakkar Siddik, Prabir Kumar Haldar, Tufan Paul, Ujjal Das, Arabinda Barman, Asim Roy, Pranab Kumar Sarkar, Nonvolatile resistive switching and synaptic characteristics of lead-free all-inorganic perovskite-based flexible memristive devices for neuromorphic systemsNanoscale, 2021
  7. Ujjal Das, Pranab Sarkar, Bappi Paul, Asim Roy, Halide perovskite two-terminal analog memristor capable of photo-activated synaptic weight modulation for neuromorphic computing, Applied Physics Letters, 2021
  8. The Journal of Physical Chemistry C,Improvement of the Resistive Switching Characteristics upon Halide Mixing in an All-Inorganic RbPbI3 Perovskite Polymer Composite Based Flexible Device,Ujjal Das, Anurag Dehingia, Bappi Paul, Pranab Kumar Sarkar, Asim Roy, 2021
  9. Anurag Dehingia, Ujjal Das, Asim Roy, Partial replacement of B-site cation to stabilize the optically active cubic phase of FAPbI3 for optoelectronic applications,Materials Today: Proceedings, 2022
  10. Ujjal Das, Pranab Kumar Sarkar, Dip Das, Bappi Paul, Asim Roy,Influence of Nanoscale Charge Trapping Layer on the Memory and Synaptic Characteristics of a Novel Rubidium Lead Chloride Quantum Dot Based Memristor, Advanced Electronic Materials, 2022
  11. Nipom Sekhar Das, Saikat Mitra, Avijit Chowdhury, Asim Roy, Nonvolatile memristive devices based on in situ functionalized layered rGO-MoS2 nanocomposites, ECS Journal of Solid State Science and Technology 2022
  12. Anurag Dehingia, Ujjal Das, Asim Roy,Compositional Engineering in α-CsPbI3 toward the Efficiency and Stability Enhancement of All Inorganic Perovskite Solar Cells, ACS Applied Energy Materials, 2022
  13. Nipom Sekhar Das, Koustav Kashyap Gogoi, Avijit Chowdhury, Asim Roy, Investigation of optical and structural properties of synthesized graphene oxide and thermally reduced graphene oxide, Materials Today: Proceedings, 2022
  14. Anurag Dehingia, Ujjal Das, Asim Roy, Interface layer modulation of an all-inorganic perovskite solar cell to study the carrier transport mechanism, Physica Scripta, 2022
  15. Electrical Reliability, Multilevel Data Storage and Mechanical Stability of MoS2-PMMA Nanocomposite Based Non-volatile Memory Device S Bhattacharjee, P Sarkar, M Prajapat, A Roy Journal of Physics D: Applied Physics
  16. Probing electron density across Ar+ irradiation-induced self-organized TiO2− x nanochannels for memory application A Barman, CP Saini, PK Sarkar, A Roy, B Satpati, D Kanjilal, SK Ghosh, … Applied Physics Letters 108 (24), 244104
  17. Multilevel programming in Cu/NiO y/NiO x/Pt unipolar resistive switching devices PK Sarkar, S Bhattacharjee, A Barman, A Kanjilal, A Roy Nanotechnology 27 (43), 435701
  18. Multilevel resistance state of Cu/La2O3/Pt forming-free switching devices PK Sarkar, M Prajapat, A Barman, S Bhattacharjee, A Roy Journal of Materials Science 51 (9), 4411-4418
  19. Interfacial and electrical properties of radio frequency sputtered ultra-thin TiO2 film for gate oxide applications M Nath, A Roy Journal of Materials Science: Materials in Electronics 26 (11), 9107-9116
  20. Morphological, Optical, and Raman Characteristics of ZnO Nanoflowers on ZnO-Seeded Si Substrates Synthesized by Chemical Method N Roy, A Chowdhury, T Paul, A Roy Journal of Nanoscience and Nanotechnology 16 (9), 9738-9745
  21. Improvement of Reliability of Polymer Nanocomposite Based Transparent Memory Device by Oxygen Vacancy Rich ZnO Nanorods S Bhattacharjee, PK Sarkar, N Roy, A Roy Microelectronic Engineering
  22. 10 2014 Zinc vacancy mediated structural phase transition and photoluminescence in nanocrystalline ZnS thin films N Roy, A Roy Journal of Materials Science: Materials in Electronics
  23. Observation of negative differential resistance and electrical bi-stability in chemically synthesized ZnO nanorods N Roy, A Chowdhury, A Roy Journal of Applied Physics
  24. Incorporation of SnO 2 nanoparticles in PMMA for performance enhancement of a transparent organic resistive memory device PK Sarkar, S Bhattacharjee, M Prajapat, A Roy RSC Advances 5 (128), 105661-105667
  25. A. Roy et al Characteristics of Strontium Bismuth Tantalate Film with ZrO2 buffer Layer for Non-Volatile Memory Application Integrated Ferroelectrics Pp.119-124, Vol.124, Issue no.1 2011
  26. B. Panda A. Roy et al Thickness and temperature dependent electrical characteristics of crystalline BaxSr1-x TiO3 thin films,, Journal of Applied Physics pp. 64116–64123 Vol. 101, No.6, 2007
  27. A. Roy et al Structural and electrical properties of metal–ferroelectric–insulator–semiconductor structure of Al/SrBi2Ta2O9/HfO2/Si using HfO2 as buffer layer, J. Phys.D: Appl. Phys.pp. 95408–95416 Vol. 41, No. 9, 2008
  28. A. Roy et al Interfacial and electrical properties of SrBi2Ta2O9/ZrO2/Si heterostructures for ferroelectric memory devices, Journal of Applied Physics pp. 64103–64108 Vol. 104, No.6, 2008
  29. A. Roy et al Temperature dependent leakage current behavior of pulsed laser ablated SrBi2Ta2O9 thin films Journal of Applied Physics Pp.44103–44108 Vol. 105, No.4, 2009
Journals (National):  
Conferences (International):
  1. N. Roy & A. Roy et al Optical Characteristics of Pulsed Laser Deposited Ba0.8Sr0.2TiO3 Thin Films Grown on Fused Quartz Substrate AIP Conference Proceeding 1451, 139 (2012); doi: 10.1063/1.4732393
Conferences (National):