Dr. Vari Sivaji Reddy
Dr. Vari Sivaji Reddy

Associate Professor

Office Address:

PH 213-B (Second Floor, Physics Bldg.) Department of Physics National Institute of Technology Calicut Kerala, India - 673601

Contact no:

0495 228 5108

Email ID:


Home Address:

D9-A, NIT Faculty Quarters, NIT Calicut Calicut - 673601

  • Ph. D. (IIT Kharagpur)

  • M. Phil. (University of Hyderabad)

  • M. Sc. (Andhra University)

  • Educational Qualifications

    • Ph. D. (IIT Kharagpur)

    • M. Phil. (University of Hyderabad)

    • M. Sc. (Andhra University)


    1. Abhijith T, Shamjid P, VS Reddy, “Influence of Ag Nanostructure Location on the Absorption Enhancement in Polymer Solar Cells”, ACS Appl. Mater. Interfaces, 10, 32483−32491 (2018).

    2. M Yoosuf Ameen, P Shamjid, T Abhijith, VS Reddy, “Solution processed transition metal oxide anode buffer layers for efficiency and stability enhancement of polymer solar cells”, Optical Materials, 75,  491(2018).

    3. M Yoosuf Ameen, P Shamjid, T Abhijith, Thulasi Radhakrishnan, VS Reddy, “Stability enhancement of P3HT: PCBM polymer solar cells using thermally evaporated MoO3 anode buffer layer”, Physica B: Condensed Matter, 530,  201 (2018).

    4. Amod Timalsina, Patrick E. Hartnett, Ferdinand S. Melkonyan, Joseph Strzalka, Vari S. Reddy, Antonio Facchetti, Michael R. Wasielewski and Tobin J. Marks, “New Donor Polymer with Tetrafluorinated Blocks for Enhanced Performance in Perylenediimide-Based Solar Cells”, Journal of Materials Chemistry A, 5, 5351 (2017).

    5. T Abhijith, T V Arun Kumar and V S Reddy, “Organic bistable memory devices based on MoO3 nanoparticle embedded Alq3 structures”, Nanotechnology, 28, 095203(2017).

    6. P Shamjid, S Anjusree, M Yoosuf Ameen, VS Reddy, “Performance enhancement of polymer solar cells by incorporating Ag nanoparticles at an indium tin oxide/MoO3 buffer layer interface”, Semiconductor Science and Technology, 32, 065010 (2017). 

    7. M Yoosuf Ameen, S Pradhan, M Remyth Suresh and V S Reddy, “MoO3 anode buffer layer for efficient and stable small molecular organic solar cells”, Optical Materials, 39, 134 (2015).

    8. M. Yoosuf Ameen, T. Abhijith, Susmita De, S.K. Ray, V.S. Reddy, “Linearly polarized emission from PTCDI-C8 one-dimensional microstructures”, Organic Electronics, 14, 554 (2013).

    9. V.S. Reddy and A Dhar, “Optical and charge carrier transport properties of polymer light emitting diodes based on MEH-PPV”, Physica B: Condensed Matter, 405, 1596 (2010).

    10. V. S. Reddy, S. Karak, and A Dhar, “Multilevel conductance switching in organic memory devices based on AlQ3 and Al/Al2O3 core-shell nanoparticles”, Appl. Phys. Lett., 94, 173301 (2009).

    11. V. S. Reddy, S. Karak, S K Ray and A Dhar, “Carrier transport mechanism in aluminum nanoparticle embedded AlQ3 structures for organic bistable memory devices”, Organic electronics, 10, 138 (2009).

    12. V. S. Reddy, S. Karak, S K Ray and A Dhar, “Photovoltaic properties of pentacene/[6,6]-phenyl C61 butyric acid methyl ester based bilayer hetero-junction solar cells”, Journal of Physics D: Applied Physics, 42, 145103 (2009).

    13. S. Karak, V. S. Reddy, S K Ray and A Dhar, “Organic photovoltaic devices based on pentacene/N,N′-dioctyl-3,4,9,10-perylenedicarboximide heterojunctions”, Organic electronics, 10, 1006 (2009).

    14. S P Mondal, V. S. Reddy, S Das, A Dhar and S K Ray, “Memory effect in a junction-like CdS nanocomposite/conducting polymer poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene-vinylene] heterostructure”, Nanotechnology, 19, 215306 (2008).

    15. V. S. Reddy, S Das, S K Ray and A Dhar, “Studies on conduction mechanisms of pentacene based diodes using impedance spectroscopy”, J. Phys. D: Appl. Phys., 40, 7687 (2007).

    16. V. Sivaji Reddy, K Das, A Dhar and S K Ray, “The effect of substrate temperature on the properties of ITO thin films for OLED applications”, Semicond. Sci. Technol., 21, 1747 (2006).

    17. D.B. Mohan, V.S. Reddy and C.S. Sunandana“AgI nanostructure development in sputter-disordered and Al-doped Ag films probed by XRD, SEM, optical absorption and photoluminescence”, Appl. Phys. A, 86, 73(2007).


    1.  Abhijith.T, YoosufAmeen M and V S Reddy, (2012), “Synthesis of PTCDI-C8 One dimensional Nanostructures for Photovoltaic Applications”, Proc. of International Conference on Material Science and Technology (ICMST), St. Thomas College Pala, India, p. 184.

    2. Abhijith.T, YoosufAmeen M and V S Reddy, (2011), “Organic Photovoltaic Devices based on CuPc Nanostructures”, Proc. of International Workshop on the Physics of Semiconductor Devices (IWPSD), IIT Kanpur, India, p. 127.        

    3. V. Sivaji Reddy, D.V. Maheswar Repaka, Supravat Karak, S.K. Ray and A. Dhar, (2009), “Organic Bistable Memory Devices Based on Donor-Acceptor Systems”,  International Conference on Hi-Tech Materials (ICHTM-09), IIT Kharagpur, India, p. 176-177

    4. S.Karak, V.S.Reddy, S.K.Ray and A.Dhar, (2009), “Effect of Pentacene Crystallinity on Photovoltaic Energy Conversion of PCBM Based Heterojunctions”, Proc. of PVSEC18 2009, Jan 19-23, Indian Association for the Cultivation of   Science, Kolkata, India, p. 35.

    5. V. S. Reddy, S. Karak, S.K. Ray and A. Dhar, (2008), “Organic Light Emitting Bistable Memory Devices Based on AlQ3”, Proc. of Photonics 2008, Habitat World Convention Center, New Delhi, India, p. 426

    6. S. P. Mondal, V. S. Reddy, S. Das, A. Dhar and S.K. Ray, (2008), “Memory characteristics of CdS nanocomposite / MEH-PPV [2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene-vinylene] heterostructures”,  Proc. of  International Conference on NANO Science & Technology (ICONSAT), 27-29 Feb., 2008, Chennai trade centre, Chennai, India, p. B-084.

    7. Suvra Prakash Prakash Mondal, Vari Sivaji Reddy, Kaustuv Das, Achintya Dhar, Samit Kumar Ray, (2008), “Growth of Ge/GeO2 Core-Shell Nanowires for Memory and Heterojunction Devices”, Proc. Of international conference on electronic materials (IUMRS-ICEM), 28th July-1st August, 2008, Hilton Sydney, Sydney, Australia, p. PM E3-S2.6.

    8. V. Sivaji Reddy, S.Das, S.K. Ray and A. Dhar, (2007), “Electrical Characteristics of Pentacene Thin Film Junctions”, Proc. of International Workshop on the Physics of    Semiconductor Devices (IWPSD) 2007, IIT Bombay, India, p. 190

    9. V. Sivaji Reddy, S. Das, S.K. Ray and A. Dhar, (2007), “Degradation of organic light emitting diodes due to voltage stress”, Proc. of IUMRS-ICAM-2007, Bangalore, India, p. I-11

    10. V. Sivaji Reddy, K. Das, S.K. Ray and A. Dhar, (2006), “Characteristics of MEH-PPV thin films on ITO electrode for organic light emitting diodes”, Proc.of 9th Asian Symposium on Information Displays (ASID-2006), New Delhi, p. 215-218

    11. V. Sivaji Reddy, S. Das, Achintya Dhar and Samit Kumar Ray, (2006), “Role of annealing environment on the properties of ITO thin films for organic light emitting diodes”, Proc.of 3 rd International Conference on Computers and Devices for Communication (CODEC-2006), Hyatt Regency Kolkata, India, p. 296

    12. V. Sivaji Reddy, Kaustuv Das, Achintya Dhar and Samit Kumar Ray, (2005), “Preparation and characterization of indium tin oxide thin films for optoelectronic device applications”, Proc. of ICOL, Dehradun, India,  p. 463

    13. V. Sivaji Reddy, D.Bharathi Mohan and C.S. Sunandana, (2005), “Effect of process induced disorder on AgI nanoparticle growth in Ag(Al) and Ag thin films” International Conference  on MEMS and semiconductor nanotechnology, Dec. 20-22, 2005, IIT Kharagpur, India,  p.202.    

    14. V.S. Reddy, D.B. Mohan and C.S. Sunandana, (2005), “AgI nanocrystal growth on RF sputtered Ag thin films”, International Conference on Physics, Chemistry and Applications of Nanostructures, Belarus, p.371.

    Professional Experience

    • Assistant Professor, NIT Calicut (March 2009 – Till Date)

    • Visiting Scholar, Department of Chemistry, Northwestern University, USA (May 2015 – October 2015)

    1. Title: “Development of Organic Solar Cells Based on Transition Metal Oxide Anode  Buffer Layers”

              PI: Dr Vari Sivaji Reddy

              Co-PI: Dr A Sujith, Department of Chemistry, NIT Calicut

              Funding Agency: Kerala State Council for Science, Technology and Environment KSCSTE (Science Research Scheme)

              Amount in Rs: 28.75 Lakhs

              Duration: 2014-2017


    1. Title: “Development of Bistable Memory Devices Based on Organic Semiconductors”

              PI: Dr Vari Sivaji Reddy

              Funding Agency: Department of Science and Technology (DST), Govt. Of India

              Amount in Rs: 21.84 Lakhs

             Duration: 2013-2016


    1. Title: “Optoelectronic Properties of Organic Light Emitting Diodes”

              PI: Dr Vari Sivaji Reddy

              Funding Agency: NIT Calicut under FRG Scheme

              Amount in Rs: 5 Lakhs 

              Duration: 2010-2013

    • Bhaskara Advanced Solar Energy (BASE) Fellowship-2015 by the Department of Science and Technology (DST), Govt. of India, and the Indo-US Science and Technology Forum (IUSSTF).

    Research Areas

    Organic and Perovskite solar cells, Plasmonics for improving the performance of solar cells, Nanomaterials for energy applications, Organic bistable memory devices


    Research Group (Organic and Nano Electronics Laboratory): 

    1. Mr Yoosuf Ameen M: Transition metal oxide anode buffer layers for performance enhancement of organic solar cells (Completed)

    2. Mr. Shamjid P: Plasmonic effects of metal nanostructures for performance enhancement of polymer solar cells (Ongoing)

    3. Mr. Abhijith T: Metal and metal oxide nanostructures for memory and solar cell applications (Ongoing)

    4. Mr Varun P K: Perovskite Solar Cells (Ongoing)


    Research Interests 

    • Organic/Polymer solar cells

    • Growth and characterization of organic semiconductor nanostrures

    • Organic bistable memory devices

    • Physics (PH1001) for B. Tech., Semester – I/II

    • Condensed Matter Physics – I (PH6211) for MSc Physics, Semester – II

    • Physics of Materials (PH6001) for M Tech (NS & ME), Semester – I 

    • Solid State Devices (PH7271) for MSc Physics, Semester – IV

    • Condensed Matter Physics (PH3002) for B Tech (EP), Semester – V

    • Semiconductor Physics and Technology (PH3004) for B Tech (EP), Semester – VI

    • Thin Film Technology (PH3024) for B Tech (EP), Semester – VI