Ph.D, MSc, B.Ed.

Dr. Sreekala currently serves as Assistant Professor at the Department of Physics, Amrita School of Arts and Sciences, Amritapuri. She was conferred with a Ph. D. in Physics from Amrita Vishwa Vidyapeetham in 2011. She plays a key role as Principal Investigators in some of the significant projects.


Ph.D. (Physics) Amrita Vishwa Vidyapeetham 2011
SLET State Level Eligibility Test for Lectureship 1996
BEd (Physical Science) Kerala University, Thiruvananthapuram, 1stDiv 1995
M. Sc. (Physics) Kerala University, Thiruvananthapuram, 1stDiv 1994


Designation University Year
Assistant Professor Department of Physics Jan 11, 2016 to Present
Assistant Professor School of Biotechnology May 21, 2012 to Jan 10, 2016
Principal Investigator of Project Amrita Vishwa Vidyapeetham May 11, 2009 to May 10, 2012
Subject Matter Expert in Physics    VALUE @Amrita Nov 10, 2008 to December 2015
Lecturer School of Biotechnology, Amrita Vishwa Vidyapeetham Aug 5, 2006 to May 20, 2012
Lecturer Devaswom Board Pampa College, Parumala Nov 5, 2004 to Apr 30, 2006 
Lecturer Government Vocational HSS, Mavelikara Nov 26, 1999 to Oct 30, 2004
Lecturer NSS College, Pandalam July 19, 1998 to Nov 24, 1999


Sl.No Title Cost (in rupees) Duration Agency
1 Pedagogy Development in Engineering Physics 7 Lakhs 2013-2015 (Ongoing) ICT
2 Organic bulk heterojunction devices for photovoltaic solar cell applications 11.65226 Lakhs 2009-2012 (Completed) DST, Govt.of India

Research Experience

Summer Fellowship- Indian Academy of Science Summer Research Fellowship (SRF-2017) in National Physical Laboratory, New Delhi. May 19, 2017 to July 15, 2017
Research Scholar --- Organic bulk heterojunction devices for photovoltaic solar cell application, funded by Government of India, Department of Science and Technology (DST), New Delhi.
Funded by Government of India, Department of Science and Technology (DST), New Delhi
January 2008 to December 2011
Principle Investigator --- VALUE @ Amrita Physics Virtual Labs, Virtual and Accessible Laboratories Universalizing Education,
Funded by Government of India Ministry of Human Resource Development (MHRD)National Mission on Education Through Information and Communication Technology (NME-ICT) (No. F.5-29/2007-DL)
November 10, 2008 to Present


Sl.No Name of the Student Topic
1 Malini Prabhakaran Synthesis of Lead Salt based Nanostructures and Heteronano structures for Photo voltaic Applications
2 Ancy Albert (Full time) Ameliorating the room temperature stability of perovskite materials for solar cell application


  • Certificate of appreciation from Amrita Vishwa Vidyapeetham for the year 2011-2012, 2012-2013, 2013-2014, 2014-2015
  • Best Paper Presentation Award, in the ICMENS-2011 conference held at Kuala Lumpur Malaysia, during Nov 4th- 6th, 2011
  • Certificate of appreciation from Amrita Vishwa Vidyapeetham for the year 2010-2011
  • Certificate of appreciation from Amrita Vishwa Vidyapeetham for the year 2009-2010
  • Young Woman Scientist Award (2008) from Department of Science and technology (DST) through a project (SR/WOS-A/PS-04/2008)


  • Organic thin film sensors for radiation sensing and biosensing applications.
  • Thin film solar cells, Dye sensitized solar cells, Perovskite solar cells etc
  • Development of Micro electro mechanical systems (MEMS)
  • Microcontact printing of Biomolecules and Nanoelectronicsic
  • Microfludics and Biosensor



Publication Type: Conference Proceedings

Year of Publication Publication Type Title


Conference Proceedings

V. G. Nandakumar, Suresh, S., Dr. Sreekala C. O., Sudheer, S. K., and Pillai, V. P. Mahadevan, “Hemigraphis Colorata As A Natural Dye For Solar Energy Conversion”, Materials Today: Proceedings, vol. 4. Elsevier, pp. 4358-4365, 2017.[Abstract]

Natural dye extracted from Hemigraphis colorata (Red flame) is used as photosensitizer in dye sensitized solar cells along with TiO2 nano particles and its characteristics are studied. The dye is extracted with minimal chemical procedure and is used without further purification. UV-Visible absorption spectroscopy and micro-Raman spectroscopic studies indicate the presence of anthocyanin and beta-carotene in the extracted dye sample. Photovoltaic property of hemigraphis colorata is studied and an energy conversion efficiency of 0.0065% was obtained. The high concentration of anthocyanin in the extracted dye sample is responsible for the photovoltaic property of hemigraphis colorata.

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Conference Proceedings

Dr. Sreekala C. O., Saneesh, P. F., Sreelatha, K. S., Kishnashree, A., and Roy, M. S., “Organic Bulk Heterojunction Solar Cell Based On Rosebengal: Nctio2 And Parameter Extraction By Simulation”, Advanced Materials Research, vol. 403. Trans Tech Publications, pp. 4304-4310, 2012.[Abstract]

In bulk heterojunction solar cells, the donor and acceptor materials are intimately blended throughout the bulk, so that the excitons generated will reach the interface within their lifetime. In this work, Rosebengal (RB) is used as the donor material and nanocrystalline Titanium dioxide (nc TiO2) as the acceptor material. Devices with device structure ITO/RB:TiO2/Ag are prepared and their optical and electrical properties are compared at different temperatures. Optical absorption spectroscopic analysis shows that the absorption of Rose bengal ranges from 650-800 nm corresponding to a band gap of 1.98 eV. Cyclic voltametric analysis, and photo voltaic properties are analysed. Using simulation, the dark current parameters such as ideality factor (n), mobility (µ) potential barrier (φb) and carrier concentration are extracted and tabulated.

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Publication Type: Journal Article

Year of Publication Publication Type Title


Journal Article

A. JS, NP, S., S, S., KP, V., ,, Prabhakaran, M., Isonc, V. V., and Dr. Sreekala C. O., “Surface Modified Lead Sulphide Quantum Dots For In Vitro Imaging Of Breast Cancer Cells Adopting Confocal Raman Spectroscopy”, International Journal of Chemical Sciences, vol. 14, 4 vol., 2016.[Abstract]

Nanoparticles are potentially used for early cancer detection, accurate diagnosis, and cancer treatment. Due to their small direct band gap and large excitation Bohr radius, lead sulphide quantum dots are important semiconductor material. The red shifted emission band, coupled with the small particle size, is facilitating clearance of imaging. Lead sulphide quantum dots bio-conjugates are promising candidates for targeted infrared molecular imaging and future infrared tissue imaging applications. Because of these many characters, in this paper, we tagged cancer cells with quantum dots for better imaging in IR region. We synthesized lead sulphide quantum dots using Hines and Scholes method. Surface modification of quantum dots is carried out using L-cysteine. Surface modification makes semiconductor quantum dots water soluble. The amino groups present in L-cysteine will bind to the cancer cells and the thiol group will bind to the quantum dots. Confocal Raman spectroscopy is used to image the cancer cells tagged with modified lead sulphide quantum dots.

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Journal Article

S. Suresh, Deepak, T. Gangadhara, Ni, C., Dr. Sreekala C. O., Satyanarayana, M., A. Nair, S., and Pillai, V. Pappukkuty, “The Role Of Crystallinity Of The Nb2O5 Blocking Layer On The Performance Of Dye-Sensitized Solar”, New Journal of Chemistry, vol. 40, 7 vol., pp. 6228-6237, 2016.[Abstract]

The prevention of back electron transfer by inserting an energy barrier layer at the interface of a photo-anode is an effective method for improving the photovoltaic parameters in dye sensitised solar cells (DSSCs). In this study, phase a modified Nb2O5 blocking layer was inserted at the fluorine doped tin oxide (FTO)/TiO2 interface via a Rf magnetron sputtering process. For a critical tunnelling distance of ∼40 nm, the crystalline Nb2O5 blocking layer improved the efficiency close to 7% and outperformed the amorphous blocking layer by about 68%. The longer electron lifetime observed in DSSCs containing an inhomogeneous Nb2O5 layer indicates that trapping/de-trapping impedes the discharge of electrons to the TiO2 band edge. The origin of the longer electron lifetime is explained by formulating a theory from photovoltage decay measurements.

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Publication Type: Thesis

Year of Publication Publication Type Title



Dr. Sreekala C. O., “Studies On Organic Bulk Heterojunction Devices For Photovoltaic Solar Cell Applications”, 2012.

Publication Type: Conference Paper

Year of Publication Publication Type Title


Conference Paper

Dr. Krishnashree Achuthan, Sreelatha, K. S., Surendran, S., Dr. Shyam Diwakar, Prof. Nedungadi, P., Humphreys, S., Dr. Sreekala C. O., Dr. Zeena S. Pillai, Raghu Raman, Deepthi, A., Gangadharan, R., Dr. Saritha A., Ranganatha, J., Sambhudevan, S., and Mahesh, S., “The VALUE @ Amrita Virtual Labs Project: Using Web Technology to Provide Virtual Laboratory Access to Students”, in Global Humanitarian Technology Conference (GHTC), 2011 IEEE, 2011, pp. 117-121.[Abstract]

In response to the Indian Ministry of Human Resource Development (MHRD) National Mission on Education through Information and Communication Technology (NME-ICT) Initiative, the Virtual and Accessible Laboratories Universalizing Education (VALUE @ Amrita) Virtual Labs Project was initiated to provide laboratory-learning experiences to college and university students across India who may not have access to adequate laboratory facilities or equipment. These virtual laboratories require only a broadband Internet connection and standard web browser. Amrita Vishwa Vidyapeetham University is part of a consortium of twelve institutions building over two hundred virtual labs covering nine key disciplines in science and engineering. This National Mission project hopes to reach out to India's millions of engineering and science students at both undergraduate and postgraduate levels. The Virtual Labs Project is providing virtual laboratory experiments that directly support the All India Council for Technical Education (AICTE) and the University Grants Commission (UGC) model curricula for engineering and sciences undergraduate and postgraduate programs.

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NIRF 2017