Gunasekhar. K R

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Dr. Gunasekhar. Principal Research Scientist

Contact
email: krguna[at]isu.iisc.ernet.in
phone: +91-080-2293 3194

Academic Background:

  • Ph. D in (IISc )

Lab:
Thin Films Laboratory

Current Research Interests:

PAPVD, Ion plating, Sputtering techniques for
Tribological, defence,space applications etc.
Academic Achievements/Awards/Honours:
  1. Life Member - Instrument Society of India
Research projects :
  • Development of Silver Coated/Silver Interconects for Space Application - Funding Agency:ISRO, Value:21.23 lakhs, Duration:Three years, Co-investigators: 1. Dr. G. Ananda Rao 2. Prof. S. Mohan
  • Development of UHV chamber for friction test, development of triode sputtering system for MoS2 coatings, Development of UHV sperical coating for optical coatings, development of Differenctilly pumped triode ion plating with e.b gun as evaporation source, development of high vacuum friction test apparatus for friction and wear measurements.
List of Publications :
  1. A. Thomas and K.R.Gunasekhar, Design and Fabrication of Ultra high vacuum valve, Presented at I.V.S. National Symposium on Thin Films at I.I.T., New Delhi, December, 1979. (50%)
  2. K.R. Gunasekhar, S. Mohan, M.Ramakrishna Rao, S. Sabastian and Nagabhushanam, Fabrication and standardisation of a thermionically supported glow discharge system, Proceedings of Nuclear Physics and Solid State Physics (India) vol. 24 C, 567 (1981) (40%).
  3. K.R. Gunasekhar, S. Mohan and M. Ramakrishna Rao, Fabrication and performance evaluation of a triode sputtering system, Journal of Instrument Society of India vol.14, 265 (1984).
  4. K.R. Gunasekhar, H.S. Vijaya, S. Mohan and M. Ramakrishna Rao, Thermionically supported triode ion plating system for depositing lubricant films, National Symposium on Thin Film Science and Technology, I.I.Sc., Bangalore, January, 1985.
  5. K.R. Gunasekhar, J. Ragunathan, S. Mohan and Joze Gasperic, Design and fabrication of a universal vacuum coating system for corrosion coatings, ICTF-7, New Delhi, India, 1987.
  6. K.R. Gunasekhar and S. Mohan, Frictional behaviour of triode ion plated lead films, ICTF-7, New Delhi, India, 1987.
  7. K.R. Gunasekhar, M.A. Murthy, Syed Azemuddin and S. Mohan, Fabrication, performance characteristics and gas analysis in a clean UHV system, Fourth Joint Vacuum Conference, Portoroz, Yugoslavia, September, 1988.
  8. K.R. Gunasekhar and S. Mohan, Triode ion plating system for tribological coatings, Seminar on Advances in Plating and Coating Technology, I.I.Sc., Bangalore, July, 1989.
  9. K.R. Gunasekhar and S. Mohan, Discharge studies in triode ion plating system, Vacuum, 42, 661 (1991).
  10. K. Madhavan, K.R. Gunasekhar and S. Mohan, Design and development of high vacuum friction test apparatus, National Symposium on Instrumentation, Cochin, (1991).
  11. K.R. Gunasekhar, M. Swarnalatha, G.K. Muralidhar and S. Mohan, Discharge studies in a triode ion plating system, National symposium on vacuum science and technology, IVSNS-93, N.P.L. New Delhi, October, 1993.
  12. K.R. Gunasekhar, S. Srinivasulu, M. Swarnalatha, M. Ghanashyam Krishna and S. Mohan, Structure and microstructure of ion plated titanium films, Thin Solid Films, 252, 7 (1994).
  13. M. Ghanashyam Krishna, K.R. Gunasekhar and S. Mohan, Low temperature synthesis of thin films of carbon nitride, Journal of Materials Research, 10, 1063 (1995).
  14. K.R. Gunasekhar, M.G. Krishna, K.N. Krishna and S. Mohan, Effect of angle of incidence on the properties of ion plated titanium films, Proc. of Second Australian International Conference on Surface Engineering, Adelaide, 7-10, March, 1994.
  15. K.R. Gunasekhar, M. Ghanashyam Krishna, A.R. Raju, K.N. Krishna and S. Mohan, Effects on oblique energetic bombardment on the morphology and microstructure of triode ion plated films, Journal of Vacuum Science and Technology,
  16. M. Ghanashyam Krishna, K.R. Gunasekhar and S. Mohan, Synthesis of carbon nitride thin films by ion plating, IURMS - IUCAM, 1994, Tiwan.
  17. C. Sravani, K.R. Gunasekhar and S. Mohan, Ion plated silver on molybdenum foils for space applications, Proceedings of International Conference on Instrumentation (ICI -96), August 8-10, 1996, Bangalore, India, Page 630-635.
  18. C. Sravani, K.R. Gunasekhar and S. Mohan, Deposition and characterisation of silver films by ion plating, Surface and Coating Technology (Press)
  19. M. Swarna latha, C. Sravani, K.R. Gunasekhar, G.K. Muralidhar and S. Mohan, Estimation of density of charge species in triode discharge system, Vacuum (Press)
  20. S. Rajeswara Rao, K.R. Gunasekhar and K. Mallikarhuna Rao, Brazeability studies using an in-situ brazing alloy on heat transferable aluminium 6061 alloy, International Welding conference - 1996 (IWC-96), Bombay, December, 1996.
  21. The effect of substrate surface on the physical properties of SnS based films, M. Devika,N. Koteeswara Reddy, K. Ramesh, H. R. Sumana, K. R. GUNASEKHAR, E. S. R. Gopal, K. T. Ramakrishna Reddy, Semiconductor Science & Technology, 21 (2006) 1495.
  22. Influence of annealing on physical properties of evaporated SnS films, M. Devika, N.Koteeswara Reddy, K. Ramesh, K. R. GUNASEKHAR, E. S. R. Gopal, K. T. Ramakrishna Reddy, Semiconductor Science & Technology, 21 (2006) 1125.
  23. Microstructure dependent physical properties of evaporated Tin Sulphide films M. Devika, K. T. Ramakrishna Reddy, N. Koteeswara Reddy, K. Ramesh, R. Ganesan, E. S. R. Gopal, K. R. GUNASEKHAR, Journal of Applied Physics, 100 (2006) 023518.
  24. Low resistive micrometer-thick SnS: Ag films for optoelectronic applications, M. Devika, N. Koteeswara Reddy, K. Ramesh, K.R.GUNASEKHAR, E. S. R. Gopal, K. T. Ramakrishna Reddy, Journal of the Electrochemical Society, 153-8 (2006) G 727.
  25. Synthesis & characterisation of co-evaporated Tin Sulphide thin films, N. Koteeswara Reddy, K. Ramesh, R. Ganesan, K. T. Ramakrishna Reddy, K. R. GUNASEKHAR, E. S. R. Gopal, Applied Physics, A 83 (2006)133.
  26. Structural & morphological properties of thermally evaporated Zn1-xMnxS nano-crystalline films.D. Sreekantha Reddy, M. Maheshwara Reddy, K. Narasimha Rao, K. R.GUNASEKHAR, P. Sreedhara Reddy, Journal of Optoelectronics & Advanced Materials, 9- 12 (2007) 3743.
  27. Microstructure & nano-hardness of the diluted magnetic semiconducting Cd1-x MnxS nano-crystalline films. D. Sreekantha Reddy, B. K. Reddy, N. Koteeswara Reddy, K. R.GUNASEKHAR, P. Sreedhara Reddy, Applied Surface Science, 253 (2007) 7318-7322.
  28. Structural & electrical properties of resistive thermal evaporated Cd1-xMnxS nano-crystalline films. D. Sreekantha Reddy, B. K. Reddy, N. Koteeswara Reddy, K. R.GUNASEKHAR, P. Sreedhara Reddy, Synthesis & Reactivity in Inorganic, Metal-Organic &  Nano-Metal Chemistry, 37 (2007) 373.
  29. Optimisation of the distance between source and substrate for device-grade SnS films grown by the thermal evaporation technique, M. Devika, N. Koteeswara Reddy, D. Sreekantha Reddy, S. Venkataramana Reddy, K. Ramesh, E. S. R. Gopal, K. R.GUNASEKHAR, V. Ganesan, Y. B. Hahn, Journal of Physics: Condensed Matter, 19 (2007) 306003(12pp).
  30. Temperature-dependent structural & optical properties of SnS films, N. Koteeswara Reddy, Y. B. Hahn, M. Devika, H. R. Sumana, K. R. GUNASEKHAR, Journal of Applied Physics, 101 (2007) 093522.
  31. Thickness effect on the physical properties of evaporated SnS films, M. Devika, N. Koteeswara Reddy, K. Ramesh, R. Ganesan, K. R. GUNASEKHAR, E. S. R. Gopal,  K.T. Ramakrishna Reddy, Journal of the Electrochemical Society, 154-2 (2007) H67.
  32. Annealing effect on physical properties of thermally evaporated MnS nano-crystalline films, D. Sreekantha Reddy, D. Raja Reddy, B. K. Reddy, A. Mallikarjuna Reddy, K. R.GUNASEKHAR, P.Sreedhara Reddy, Journal of Optoelectronics & Advanced Materials, 9-7 (2007) 2019-2022.
  33. Microstructure, optical & photoluminescence properties of simple thermal evaporated CdS nano-crystalline films, D. Sreekantha Reddy, B. Kang, Seong-cho Yu, K. R.GUNASEKHAR, K. Narasimha Rao, A. Divya, P. Sreedhara Reddy, Journal of Optoelectronics & Advanced Materials, 9-12 (2007) 3747-3750.
  34. Structural & photoluminescence properties of thermally evaporated Cd1-xMnxS nano-crystalline films, D. Sreekantha Reddy, D. Raja Reddy, N. Koteeswara Reddy, K. R.GUNASEKHAR, R. P. Vijayalakshmi, B. K. Reddy, P. Sreedhara Reddy, Solid State Communications, 142 (2007) 466.
  35. Synthesis & characterization of nano-crystalline SnS films grown by thermal evaporation technique, M. Devika, N. Koteeswara Reddy, D. Sreekantha Reddy, Q. Ahsannulhaq, K.Ramesh, E. S. R. Gopal, K. R. GUNASEKHAR, Y. B. Hahn, Journal of The Electrochemical Society, 155-2 (2008) H130-H135.
  36. Synthesis & dc magnetic susceptibility of the diluted magnetic semiconducting Cd1-xMnxS nanocrystalline films, D. Sreekantha Reddy, K. Narasimha Rao, K. R. GUNASEKHAR, K. Dwarakanadha Reddy, P. Sreedhara Reddy, Journal of  Alloys & Compounds, 34-38 (2008) 461(1-2).
  37. Synthesis & optical characterization of Cd1-xMnxS nano-crystalline films, D. Sreekantha Reddy, D. Raja Reddy, B. K. Reddy, N. Koteeswara Reddy, K. R. GUNASEKHAR, P. Sreedhara Reddy, Optical Materials, 30(2008) 924-929.
  38. Annealing effect on structural & optical properties of diluted magnetic semiconducting Zn 1-xMnx S nanostructured films, D.Sreekantha Reddy, M.Maheswara Reddy, Bycongwon Kang, Scong-Cho Yu, K.Narasimha Rao, K.R.GUNASEKHAR, B.K.Reddy, P.Sreedhara Reddy, Solid State Sciences, 10 (2008) 1068-1073.
  39. Ohmic contacts to SnS films: Selection & estimation of thermal stability, M.Devika, N.Koteeswara Reddy, F. Patolsky, K.R.GUNASEKHAR, Journal of Applied Physics, 104 (2008) 124503.
  40. Synthesis & characterization of diluted magnetic semiconducting Zn1-xMnxS nanostructured films, D.Sreekantha Reddy, Bycongwon Kang, Scong-Cho Yu, K.Narasimha Rao, K.R.GUNASEKHAR, P.Sreedhara Reddy, Journal of Sensor Letters, 6 (2008) 294-298.
  41. Structural & photoluminescence properties of Zn1-x MnxO nanoparticles for optoelectronic device applications, D.Sreekantha Reddy, S.K. Sharma, Y.D.Reddy, K.R.GUNASEKHAR, P.Sreedhara Reddy, Journal of Optoelectronics and Advanced Materials, 10 (10) (2008) 2607-2610.
  42. Strain, luminescence & electrical properties of Zn1-xMnxS nanocrystalline films prepared on silicon wafers, D.Sreekantha Reddy, Bycongwon Kang, Scong-Cho Yu, K.Narasimha Rao, K.R.GUNASEKHAR, P.Sreedhara Reddy, Journal of Applied Physics, 104(1) (2008) 013532 (12pp).
  43. Electrical properties of thermal evaporated Cd1-xMnxS nanocrystalline films, D.Sreekantha Reddy, K.S.Kumar, N.K.Reddy, B.K.Reddy,  K.R.GUNASEKHAR, P.Sreedhara Reddy, Journal of Electrochemical Society 155 (2008) H407-411.
  44. Synthesis & characterization of Zn1-xMnxS nanostructured films prepared on glass substrates, D.Sreekantha Reddy, Bycongwon Kang, Scong-Cho Yu, K.Narasimha Rao, K.R.GUNASEKHAR, P.Sreedhara Reddy, Applied Physics A 91(4) (2008) 627-630.
  45. Nanostructured Cd1-xMnxS films for spintronics & optoelectronic device applications: synthesis and characterization, D.Sreekantha Reddy, B.K.Reddy,  K.R.GUNASEKHAR, P.Sreedhara Reddy, Journal of Nanoscience & Nanotechnology, 8 (2008) 6487-6490.
  46. Electrical & mechanical properties of diluted magnetic semiconductor Zn1-xMnxS nanocrystalline films, D.Sreekantha Reddy, Bycongwon Kang, Scong-Cho Yu, K.Narasimha Rao, K.R.GUNASEKHAR, P.Sreedhara Reddy, Journal of Current Applied Physics, 9 (2009) 431-434.
  47. Weak rectifying behaviour of p-SnS/n-ITO heterojunctions, M.Devika, N.Koteeswara Reddy, K.Ramesh, F.Patolsky, K.R.GUNASEKHAR, Solid State Electronics, 53 (2009) 630-634.
Facilities available:
  • Resistive evaporation
  • Electron beam evaporation, triode ionplating
  • Diode
  • Magnetron and Triode
  • Sputtering systems