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Dr. S. Ramasubramanian

Assistant Professor, Department of Sciences, School of Physical Sciences, Coimbatore

Qualification: BSc, MSc, Ph.D
s_ramasubramanian@cb.amrita.edu
Google Scholar Profile
Scopus Profile
Research Interest: Semiconductor Physics and devices, Luminescence for Energy applications

Bio

Dr. S. Ramasubramanian currently serves as Assistant Professor in Physics, Department of Sciences, School of Physical Sciences, Coimbatore Campus.

Dr. S. Ramasubramanian, research interest includes semiconductor physics, p-type transparent semiconducting oxides, and luminescence materials. He has experience in defect analysis in semiconductors and the role of dopants on the properties of semiconductors. He has also engaged in the theoretical investigations of different properties in materials using density functional theory. He has presented his research works at more than 20 national and international conferences. He has the recipient of a short-term JSPS fellowship for visiting the Nagoya Institute of Technology, Nagoya, Japan during the years 2009 and 2011.

Current Research

  • Devices based on p-type semiconductors
  • ZnO nanorods based photodetectors
  • Magnetic properties of doped semiconductors
  • Luminescence materials for increasing solar cell efficiency
Publications

Journal Article

Year : 2023

Emission colourr tuning in KLnF4:Yb3+,Er3+/Ho3+ phosphor

Cite this Research Publication : Janani K, Gayathri E, Vijayatha V, Ramasubramanian S, Thiyagarajan P, “ Emission colourr tuning in KLnF4:Yb3+,Er3+/Ho3+ phosphor”, Journal of Rare Earths, 2023 https://doi.org/10.1016/j.jre.2023.02.014

Publisher : Journal of Rare Earths

Year : 2022

Dip to Drink: Solar Photocatalytic Reduction of Cr(VI) Using Fibrous Red Phosphorus Immobilized Quartz Sand as “Dip-Catalyst”

Cite this Research Publication : Smera, R., Roshith, M., Ramasubramanian, S., Kumar, D.V. R., Dip to Drink: Solar Photocatalytic Reduction of Cr(VI) Using Fibrous Red Phosphorus Immobilized Quartz Sand as “Dip-Catalyst”. J InorgOrganometPolym, 2022, 32, 1800–1809 DOI: https://doi.org/10.1007/s10904-022-02281-5

Publisher : J InorgOrganometPolym

Year : 2021

Tuning the structural and luminescence properties of LiYF4: Yb, Er upconversion phosphor: Understanding the role of K ion concentration

Cite this Research Publication : K. Janani, S. Ramasubramanian, DharbaV. Ravikumar, P.Thiyagarajan Tuning the structural and luminescence properties of LiYF4: Yb, Er upconversion phosphor: Understanding the role of K ion concentration Optik 243 167470 (5) 2021

Publisher : Optik

Year : 2021

Continuous flow solar photocatalytic disinfection of E. coli using red phosphorus immobilized capillaries as optofluidic reactors

Cite this Research Publication : Roshith, M., Pathak, A., Kumar, A.N., Anantharaj, G., Saranyan, V., Ramasubramanian, S., Babu, T.S. and Kumar, D.V.R., Continuous flow solar photocatalytic disinfection of E. coli using red phosphorus immobilized capillaries as optofluidic reactors. Appl. Surf. Sci., 2021, 540, 148398.

Publisher : Applied Surface Science

Year : 2019

Investigations on the synthesis dependent luminescence property of LiGdF4: Eu3+ microcrystals

Cite this Research Publication : N. V, K, J., Darba, V. Ravikumar, and Dr. S. Ramasubramanian, “Investigations on the synthesis dependent luminescence property of LiGdF4: Eu3+ microcrystals”, Optik, vol. 198, p. 163233, 2019.

Publisher : Optik

Year : 2019

Effect of gadolinium concentration on the luminescence of LiYF4:Yb3+/Er3+ phosphor

Cite this Research Publication : K. Janani, Dr. S. Ramasubramanian, Thangavel, R., and Thiyagarajan, P., “Effect of gadolinium concentration on the luminescence of LiYF4:Yb3+/Er3+ phosphor”, Solid State Sciences, vol. 91, pp. 119-125, 2019.

Publisher : Solid State Sciences

Year : 2019

Urchin-like fibrous red phosphorus as an efficient photocatalyst for solar-light-driven disinfection of E. coli

Cite this Research Publication : Roshith, M., Kumar, M. S., Kumar, A. K. N., Ramasubramanian, S., Stanley, J., Babu, T. G. S., Kumar, D. V. R., Urchin-like fibrous red phosphorus as an efficient photocatalyst for solar-light-driven disinfection of E. coli, J. Photochem. Photobiol. Chem, 2019, 384, 112034

Publisher : J. Photochem. Photobiol. Chem

Year : 2018

Luminescence properties of LiYF4:Yb3+, Er3+ phosphors: A study on influence of synthesis temperature and dopant concentration

Cite this Research Publication : K. Janani, Dr. S. Ramasubramanian, Soni, A. K., Rai, V. K., and Thiyagarajan, P., “Luminescence properties of LiYF4:Yb3+, Er3+ phosphors: A study on influence of synthesis temperature and dopant concentration”, Optik, vol. 169, pp. 147-155, 2018.

Publisher : Optik

Year : 2017

Magnetic properties of gadolinium and carbon co-doped gallium nitride

Cite this Research Publication : S. N. Kaleemullah, Dr. S. Ramasubramanian, Mohankumar, R., S. Basha, M., Rajagopalan, M., and Kumar, J., “Magnetic properties of gadolinium and carbon co-doped gallium nitride”, Solid State Communications, vol. 249, pp. 7-11, 2017.

Publisher : Solid State Communications

Year : 2015

Effect of Fe substitution on the electronic structure, magnetic and thermoelectric properties of Co2FeSi full Heusler alloy: A first principle study

Cite this Research Publication : R. Mohankumar, Dr. S. Ramasubramanian, Rajagopalan, M., M. Manivel Raja, Kamat, S. V., and Kumar, J., “Effect of Fe substitution on the electronic structure, magnetic and thermoelectric properties of Co2FeSi full Heusler alloy: A first principle study”, Computational Materials Science, vol. 109, pp. 34-40, 2015.

Publisher : Computational Materials Science

Year : 2015

Density functional study of half-metallic property on B2 disordered Co2FeSi

Cite this Research Publication : R. Mohankumar, Dr. S. Ramasubramanian, Rajagopalan, M., M. Raja, M., Kamat, S. V., and Kumar, J., “Density functional study of half-metallic property on B2 disordered Co2FeSi”, Journal of Materials science, vol. 50, no. 3, pp. 1287 - 1294, 2015.

Publisher : Journal of Materials science

Year : 2013

Study on the ferromagnetism in Co and N doped ZnO thin films

Cite this Research Publication : Dr. S. Ramasubramanian, Thangavel, R., Rajagopalan, M., Thamizhavel, A., Asokan, K., Kanjilal, D., and Kumar, J., “Study on the ferromagnetism in Co and N doped ZnO thin films”, Current Applied Physics, vol. 13, pp. 1547-1553, 2013.

Publisher : Current Applied Physics

Year : 2012

Investigations of cobalt and carbon codoping in gallium nitride for spintronic applications

Cite this Research Publication : M. S. Basha, Dr. S. Ramasubramanian, Rajagopalan, M., and Kumar, J., “Investigations of cobalt and carbon codoping in gallium nitride for spintronic applications”, Journal of Magnetism and Magnetic Materials, vol. 324, pp. 1528-1533, 2012.

Publisher : Journal of Magnetism and Magnetic Materials

Year : 2011

Investigations on cobalt doped GaN for spintronic applications

Cite this Research Publication : M. S. Basha, Dr. S. Ramasubramanian, Rajagopalan, M., Kumar, J., Kang, T. Won, N. Subramaniam, G., and Kwon, Y., “Investigations on cobalt doped GaN for spintronic applications”, Journal of Crystal Growth, vol. 318, pp. 432-435, 2011.

Publisher : Journal of Crystal Growth

Year : 2010

Elastic and thermodynamical properties of A15 Nb3X (X = Al, Ga, In, Sn and Sb) compounds

Cite this Research Publication : M. Sundareswari, S. Ramasubramanian and M.Rajagopalan Elastic and thermodynamical properties of A15 Nb3X (X = Al, Ga, In, Sn and Sb) compounds — First principles DFT study Solid state communications 150 2057-2060 2010

Publisher : Solid state communications

Year : 2010

Magnetic properties of Ni doped gallium nitride with vacancy induced defect

Cite this Research Publication : M. S. Basha, Dr. S. Ramasubramanian, Thangavel, R., Rajagopalan, M., and Kumar, J., “Magnetic properties of Ni doped gallium nitride with vacancy induced defect”, Journal of Magnetism and Magnetic Materials, vol. 322, pp. 238-241, 2010.

Publisher : Journal of Magnetism and Magnetic Materials

Year : 2009

Ab initio study on elastic and thermodynamical properties of Ti 1-x Zr x C

Cite this Research Publication : Dr. S. Ramasubramanian, Mathrubutham, R., Thangavel, D. Rajalingam, and Kumar, J., “Ab initio study on elastic and thermodynamical properties of Ti 1-x Zr x C”, The European Physical Journal B - Condensed Matter and Complex Systems, vol. 69, pp. 265-268, 2009.

Publisher : The European Physical Journal B - Condensed Matter and Complex Systems

Year : 2009

Electronic and optical properties of mixed anion layered oxychalcogenide semiconductors: An ab initio study

Cite this Research Publication : Dr. S. Ramasubramanian, Mathrubutham, R., Kumar, J., and Thangavel, D. Rajalingam, “Electronic and optical properties of mixed anion layered oxychalcogenide semiconductors: An ab initio study”, Journal of Applied Physics, vol. 106, pp. 023720 - 023720, 2009.

Publisher : Journal of Applied Physics

Year : 2009

Theoretical investigation of the electronic and optical properties of Zn2OX (X=S, Se, Te) in chalcopyrite phase by full potential methods

Cite this Research Publication : Dr. S. Ramasubramanian, Thangavel, R., Rajagopalan, M., and Kumar, J., “Theoretical investigation of the electronic and optical properties of Zn2OX (X=S, Se, Te) in chalcopyrite phase by full potential methods”, Journal of Alloys and Compounds, vol. 479, pp. 414-419, 2009.

Publisher : Journal of Alloys and Compounds

Conference Proceedings

Year : 2020

Tuning emission colour in Tm3+ doped Yb3+: KLnF4 (Ln = Y, Yb and Gd) upconversion phosphors

Cite this Research Publication : K. Janani, Dr. S. Ramasubramanian, and Thiyagarajan, P., “Tuning emission colour in Tm3+ doped Yb3+: KLnF4 (Ln = Y, Yb and Gd) upconversion phosphors”, Materials Today: Proceedings, vol. 33. pp. 2082-2085, 2020.

Publisher : Materials Today: Proceedings

Year : 2012

Theoretical study of electronic and elastic properties of Li(Mg, Zn)N alloy

Cite this Research Publication : M. Rajagopalan, Dr. S. Ramasubramanian, and Kumar, J., “Theoretical study of electronic and elastic properties of Li(Mg, Zn)N alloy”, AIP Conference Proceedings, vol. 1447. pp. 809-810, 2012.

Publisher : AIP Conference Proceedings

Year : 2012

First -principles calculations of ferromagnetism in ZnO co-doped with cobalt and nitrogen

Cite this Research Publication : M. Rajagopalan, Dr. S. Ramasubramanian, and Kumar, J., “First -principles calculations of ferromagnetism in ZnO co-doped with cobalt and nitrogen”, American Institute of Physics (AIP) Conference Proceedings, vol. 1447. pp. 1155-1156, 2012.

Publisher : American Institute of Physics (AIP)

Book Chapter

Year : 2014

Chapter 15 – On the Optical and Magnetic Properties of Doped-ZnO

Cite this Research Publication : J. Kumar, Dr. S. Ramasubramanian, Thangavel, R., and Rajagopalan, M., “Chapter 15 - On the Optical and Magnetic Properties of Doped-ZnO”, in ZnO Nanocrystals and Allied Materials - Springer series in materials science, Springer 2014th ed., vol. 180, 2014, pp. 309-329.

Publisher : ZnO Nanocrystals and Allied Materials - Springer series in materials science

Academic Qualifications
Degree University
Ph.D. Crystal Growth Centre, Anna University, Chennai
M.Sc. Department of Physics, Manonmaniam Sundaranar University
B.Sc. Sri Paramakalyani College, Alwarkurichi Manonmaniam Sundaranar University
Professional Appointments
Position Held Institute/University
Assistant Professor Dept. of Sciences, Amrita University, Coimbatore 20 June 2016 – Present
Teaching Fellow Dept. of Physics, Anna University, Chennai 19 February 2014 – 31 May 2016
JRF in the DST project “Capacitance and Conductance-based sensor Instrumentation for Biochemical Characterization” DST 2008-2009
National Doctoral Fellow AICTE, India 2009-2012
SRF in CSIR Project CSIR 2012-2013
Short-term JSPS fellowship for visiting Nagoya Institute of Technology, Nagoya, Japan JSPS, Japan 2009,2011
Research Guidance

Ph.D.

Ph.D. Student Title Status
Akshai Shyam Solution processed copper-based p-type semiconductors for optoelectronic applications Ongoing
Aryalakshmi S Semiconducting materials for Thermoelectric and Photo-thermoelectric devices Ongoing
Membership in Professional Bodies
  • Lifetime member of the Indian crystal growth association, (ICGA)
Teaching
  1. Physics of Semiconductor Devices
  2. Analog Electronics
  3. Basic Electronics
  4. Medical Physics
  5. Physics of Electronic materials
  6. Engineering Physics
  7. Condensed Matter Physics
  8. Optoelectronic Devices
  9. Semiconducting Materials and Devices
  10. X-ray diffractions and its applications
  11. Basics of Electricity and Magnetism
  12. Materials Science for Energy applications
Admissions Apply Now