Doctorates' Information System

     Rajkumar Singha

Ph.D. fromIndian Institute of Technology Kharagpur - Physics and Meteorology
Supervisor(s)  Prof. S. K. Ray, Dr. A. Dhar
Ph.D. status  Joined in 2005 :: Completed in 2011
AddressB.R.Sikdar, FE 473, Saltlake, Sector 3, Kolkata-700106
Phone09434958832
Emailrksingha@gmail.com
Formal Education
Exam / Degree Board / UnivBranchYear
M.Sc.University of CalcuttaPhysics2001
M.Tech.Indian Institute of Technology KharagpurSolid State Technology2004

Research Areas
  • Experimental Condenced Matter Physics
  • Semiconductor Nanotechnology
  • Optoelectronics and Electronic Device Fabrication

Skills
  • Growth of self assembled Ge (Si) nanoislands by molecular beam epitaxy (MBE)
  • Thin film deposition by thermal evaporation, DC and radio frequency (RF) Magnetron sputtering
  • Thin film deposition by Pulsed Laser deposition (PLD) technique.
  • Vapour liquid solid (VLS) phase growth technique using furnace.
  • Thermal evaporation, Chemical deposition and Spin coat technique.
  • High vacuum technique (10E-10 torr). Used Sorption, Rotary, Diffusion, Turbo, Cryo and Ion pumps.
  • Low temperature System (Closed cycle Double wall cryorefrigerator)
  • Photoluminescence Spectroscopy (visible, near- and far- IR region).
  • Photoluminescence decay measurements.
  • Electrical characterization using Keithley 4200-SCS semiconductor parameter analyser.
  • Infra-red photocurrent spectroscopy
  • Atomic Forced Microscopy (AFM), C-AFM, EFM
  • High resolution X-ray diffraction (HRXRD) (Philips-Pert PRO MRD)
  • Melt spinning, Arc melting, High temperature Furnace

Awards
  • Best poster presentation award, NSNT-2007 from Nanoscience and Nanotechnology Initiative, Department Science and Technology (DST), Govt. of India
  • Best poster presentation award, 98th Indian Science Congress, Chennai, January 2011 from Indian Science Congress Association.
  • Best poster presentation award on National Workshop on Nanotechnology for Defence Applications (NWNDA-2011) from Defence Research and Development Organisation (DRDO), Govt. of India.

Experience
  • Research Associate, From 16/06/11 to till date, IIT Kharagpur, DRDO
  • Senior Research Fellow, From 01/02/05to 04/07/05, IIT Kharagpur, Dept. of Information Technology
  • Project Associate, From 01/07/04 to 31/01/05, IIT Kharagpur, DRDO

Fellowships / Scholarships
  • Graduate aptitude test on engineering (GATE) 2002, All India Council of Technical Education (AICTE), Govt. of India.
  • National Doctoral Fellowship (NDF) 2005, High value scholarship from All India Council of Technical Education (AICTE), Govt. of India.

Papers Published in Journals
  • Room temperature infrared photoresponse of self assembled Ge/Si (001) quantum dots grown by Molecular Beam Epitaxy by R. K. Singha, S. Manna, S. Das, A. Dhar, and S. K. Ray Appl. Phys. Lett. Vol. 96, p. 233113-3 (2010)
  • Single Hole Charging at Room Temperature of Ge Quantum Dots Grown on Si(001) by Molecular Beam Epitaxy by R. K. Singha, S. Das, A. Dhar, S. K. Lahiri, S. K. Ray, A. Surawijaya, and S. Oda Nanoscience and Nanotechnology Letters Vol. 1,p.1-5 (2009)
  • Evolution of strain and composition of Ge Islands on Si (001) Grown by Molecular Beam Epitaxy during Post-Growth Annealing by R. K. Singha, S. Das, S. Majumdar, K. Das, A. Dhar and S. K. Ray J. Applied Physics Vol. 101, p. 114301 (2008)
  • Shape and size distribution of MBE grown self-assembled Ge islands on Si (001) substrates by R. K. Singha, S. Das, K. Das, S. Majumdar, A. Dhar and S. K. Ray J. Nanoscience and Nanotechnology Vol. 8, No. 7, p. 4101-4105 (2008)
  • Characteristics of Ge nanocrystals grown by RF magnetron sputtering by R. K. Singha, K. Das, S. Das, A. Dhar and S. K. Ray Advanced Materials Research Vol. 31, p. 89-91 (2008)
  • Ge based nanostructures for electronic and photonic devices by S. K. Ray, R. K. Singha, S. Das, S. Manna, A. Dhar Microelectronics Reliability Vol. 50, p. 674-678 (2010)
  • Correlation between microstructure and electronic behaviour in rapidly quenched Fe-substituted granular Cu-Co alloys by R. Singha, A. Dhar, D. Bhattacharya, M. Chakraborty, V. Srinivas, S. K. Ray Thin Solid Films Vol. 505, p. 157-160 (2006)
  • Structural and Optical Properties of Germaniun Nanostructures on Si (100) and Embedded in High-k Oxides by S. K. Ray, S. Das, K. Das, R. K. Singha, S. Manna, A. Dhar Nanoscale Research Letters Vol. 6, p. 224 (2011)
  • Microstrustural characteristics and phonon structures in luminescence from surface oxidized Ge nanocrystals embedded in HfO2 matrix by S. Das, R. K. Singha, S. Gangopadhyay, A. Dhar and S. K. Ray J. Appl. Phys. Vol. 108, p. 053510-1-7 (2010)
  • Microstrustural, chemical bonding, stress development and charge storage characteristics of Ge nanocrystals embedded in hafnium oxide by S. Das, R. K. Singha, S. Manna, S. Gangopadhyay, A. Dhar and S. K. Ray J. of Nanoparticle Research Vol.13, p. 587-595 (2011)
  • Light emission and floating gate memory characteristics of germanium nanocrystals by S. Das, S. Manna, R. K. Singha, A. Anopchenko, N. Daldosso, L. Pavesi, A. Dhar, and S. K. Ray Physica status solidi A Vol. 208, p. 635-638 (2011)
  • Improved IR photoluminescence characteristics from circularly ordered self-assembled Ge islands by S. Das, K. Das, R. K. Singha, S. Manna, A. Dhar, S. K. Ray and A. Raychaudhuri Nanoscale Research Letters Vol. 6. p. 416 (2011)
  • Electroluminescence and charge storage characteristics of quantum confined germanium nanocrystals, by S. Das, R. K. Singha, A. Dhar, S. K. Ray, A. Anopchenko, N. Daldosso and L. Pavesi J. Appl. Phys. Vol. 110, p. 024310-4 (2011)
  • Improved Charge Storage Characteristics of Ge Nanocrystals Embedded In Hafnium Oxide by S. Das, K. Das, R. K. Singha, A. Dhar, and S. K. Ray Appl. Phys. Letts. Vol. 91, p. 233118 (2007)
  • Properties of self-assembled Ge Islands grown by molecular beam epitaxy, by S. K. Ray, R. K. Singha, S. Das, K. Das and A. Dhar International J. Nanoechnology Vol. 6, Nos. 5/6, p. 552-566 (2009)
  • Silicon Dioxide Embedded Germanium Nanocrystals Grown Using Molecular Beam Epitaxy for Floating Gate Memory Devices by S. Das, R. K. Singha, K. Das, A. Dhar, and S. K. Ray Journal of Nanoscience and Nanotechnology Vol. 9, p. 5484-5488 (2009)
  • Microstructure and magnetic properties of melt-spun Cu0.95Co0.05 granular alloy by S. Majumdar, R. K. Singha, J. Yoon, M. H. Jung, M. Chakraborty, A. K. Das, S. K. Ray Physica B Vol. 404, p. 1858 (2009)
  • Optical and structural characteristics of ZnO thin films grown by rf magnetron sputtering by S. Mandal, R. K. Singha, A. Dhar, S.K. Ray Mat. Res. Bull. Vol. 43, p. 244-250 (2008)
  • Temperature-dependent texture, stress and resistivity in melt spun Cu0.95Co0.05 ribbon by S. Majumdar, R. K. Singha, K. Das, M. Chakraborty, A.K. Das and S.K. Ray Physica B Vol. 403 p. 2059-2064 (2008)
  • Formation of Y- and T-junction Ge nanowires by vapor-liquid-solid mechanism by K. Das, A. K. Chakraborty, M.L. NandaGoswami, R. K. Singha, A. Dhar,K. S. Coleman and S. K. Ray Int. J. Nanoscience Vol.6, Issue 6, p. 467-471 (2007)
  • Temperature dependent shape transformation of Ge nanostructures by vapor-liquid-solid method by K. Das, A. K. Chakraborty, M. L. NandaGoswami, R. K. Singha, A. Dhar, K. S. Coleman and S. K. Ray J. Appl. Phys. Vol. 101, p. 074307 (2007)

Indian Institute of Technology, Kharagpur-721 302, INDIA
Telephone Number +91-3222-255221 | FAX : +91-3222-255303