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 University in 2011. She plays a key role as Principal Investigators in some of the significant projects.

Education

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

Experience

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

Projects

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

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

 

PhD STUDENTS

Sl.No Name of the Student Topic
1 Malini Prabhakaran Synthesis of Lead Salt based Nanostructures and Heteronano structures for Photo voltaic Applications.
2 Jinchu I. Natural dyes as efficient candidates for enhancing the photovoltaic properties of Dye sensitized solar cells

Awards

  • Certificate of appreciation from Amrita Vishwa Vidyapeetham University for the year 2014-2015
  • Certificate of appreciation from Amrita Vishwa Vidyapeetham University for the year 2013-2014
  • Certificate of appreciation from Amrita Vishwa Vidyapeetham University for the year 2012-2013
  • Certificate of appreciation from Amrita Vishwa Vidyapeetham University for the year 2011-2012
  • 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 University for the year 2010-2011
  • Certificate of appreciation from Amrita Vishwa Vidyapeetham University 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)
     

INTEREST

  • 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
     

TEACHING

Publications

Publication Type: Journal Article
Year of Conference Publication Type Title
2016 Journal Article J. .I, .R, J., .Pandurangan, N., .S.Sreelatha, K., .Achuthan, K., and Sreekala, C. O., “Anthraquinones- A probe to enhance the photovoltaic properties of DSSC”, International Journal of Electrical and Computer Engineering (IJECE), 2016.
2015 Journal Article C. O. Sreekala, Jinchu, I., Sajeev, U. S., Achuthan, K., and Sreelatha, K. S., “Photoanode Engineering Using TiO2 Nanofibers for Enhancing the Photovoltaic Parameters of Natural Dye Sensitised Solar Cells”, Journal of Nano-and Electronic Physics, vol. 7, no. 4, pp. 4002-1, 2015.[Abstract]

Dye Sensitized solar cell (DSSC) have been looked upon as having the potential to modernize photovoltaic as a cost effective technology. Especially nanostructured DSSC is proposed to have the capability to boost the efficiency by limiting charge recombination, thereby increasing the charge transportation which affects the overall conversion efficiency favourably. In the present work we discuss the effect of nanofibers as photo anode for increasing the efficiency of a dye sensitized solar cell. As we know nanostructured metal oxides have paying much attention in the field of photovoltaics due to their physical properties and dimensionality. This type of geometry provides direct and spatially separated charge transport channels for electrons and holes. TiO2 single-crystalline nanofibers of different diameter are prepared by electrospinning process and TiO2 nanoparticles by doctor blade technique are used for fabricating the device using natural sensitizers.

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2015 Journal Article C. O. Sreekala, “Photovoltaic studies of dye sensitized solar cell with modified PEDOT:PSS as counter electrode”, International Journal of Advance Research in Science and Engineering, vol. 4, no. 4, pp. 90-95, 2015.
2015 Journal Article B. Krishnan, .M, A., .S, A., .J, S., Kumar.M, K., .U.S, S., and Sreekala, C. O., “Electrospun TIO2 nanofibers as a matrix to enhance the drug loading”, IJARSE, vol. 4, no. 05, 2015.
2013 Journal Article C. O. Sreekala, Roy, M. S., .S.Sreelatha, K., Kumar, K. B. S. P., and Jinchu, I., “Functionalized Multi Walled Carbon Nanotubes (MWCNTs) for enhanced Photocurrent in Dye Sensitized Solar Cells”, Journal Of Nanostructure in Chemistry, vol. 3, 2013.[Abstract]

The influence of the incorporation of nitric acid-treated (functionalized) multi-walled carbon nanotubes (f-MWCNTs) and unmodified MWCNTs in TiO2 films are investigated by observing the photocurrent-voltage characteristics of dye-sensitized solar cells (DSSCs) with and without MWCNTs. The short-circuit photocurrent (J sc) of the modified DSSC increased by 46% compared with that of a cell with plain TiO2 film. The open-circuit voltage remained the same for all cases. The enhanced J sc is explained by the increased surface area of the film, enhanced cluster formation of TiO2 particles around f-MWCNTs, and improved interconnectivity of TiO2 particles in the presence of f-MWCNTs. The efficiency of the cell increased by 45% due to J sc enhancement.

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2012 Journal Article C. O. Sreekala, Jinchu, I., Sreelatha, K. S., Janu, Y., Prasad, N., Kumar, M., Sadh, A. K., and Roy, M. S., “Influence of Solvents and Surface Treatment on Photovoltaic Response of DSSC Based on Natural Curcumin Dye”, Photovoltaics, IEEE Journal of, vol. 2, pp. 312–319, 2012.[Abstract]

Dye-sensitized solar cells have recently drawn much attention because of their cost effectiveness and easy manufacturing process. However, the challenge lies in minimizing the cost of sensitizer dyes and the platinum-based counter electrode. Natural dyes such as red cabbage, red perilla, rosella, blue pea, and curcumin represent a low-cost, environmentally friendly alternative to costly ruthenium-based complexes for sensitization of nc-TiO$_2$. Attempts are being made to improve the efficiency of a cell based on natural dyes by way of selecting a proper sensitizer, modifying the surface of a working electrode by chemical treatment, and replacing a platinum-based counter electrode. We have adopted two approaches to improve the photovoltaic response of a cell, i.e., 1) modifying the surface of a working electrode by treating it with HCl and TiCl$_4$ and 2) using different organic solvents to enhance the extent of sensitization. PEDOT:PSS grown over graphite-coated fluorine-doped tin oxide is used as a counter electrode to catalyze the reduction of triiodide (${rm I}_3^ -$) to iodide (I$^-$). A TiCl$_4$ -treated photoelectrode, on sensitization with curcumin, gives maximum power conversion efficiency. The impact of the solvent's polarity in dye diffusion was determined with cyclic voltametry. Kelvin probe, SEM, and Raman spectroscopy are employed to justify the surface modification of nc-TiO$_2$ induced by TiCl$_4$ treatment.

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2012 Journal Article C. O. Sreekala, 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-Mems, Nano and Smart Systems, vol. 403, 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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2012 Journal Article C. O. Sreekala, “Studies on organic bulk Heterojunction devices for photovoltaic solar cell applications”, p. 121, 2012.[Abstract]

Dye-sensitized solar cells are emerging as most promising cost effective, easy to fabricate without involving sophisticated lithographic technique being employed towards aking
conventional solar cells. DSSC works on a principle similar to photosynthesis. We have used some anthocyanine pigment of flowers for sensitization of nanocrystalline TiO2. It has been found that sensitizer substantially enhances the photoconductivity of the material and also broadens the photoaction spectrum towards lower photon energy.

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Publication Type: Conference Paper
Year of Conference Publication Type Title
2011 Conference Paper K. Dr. Achuthan, Sreelatha, K. S., Surendran, S., Dr. Diwakar, S., Prema Nedungadi, Humphreys, S., Sreekala, C. O., Pillai, Z. S., Raman, R., Deepthi, A., Gangadharan, R., Appukuttan, S., 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 (Amrita 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. More »»
2011 Conference Paper C. O. Sreekala, Sreelatha, K. S., and Roy, M. S., “Hybrid Bulk Heterojunction Solar Cells based on Metal Phthalocyanines”, in National Seminar on Trends in Physical Sciences (TriPS-2011), SreeSankara College, Kalady, Kerala, 2011.
2010 Conference Paper K. B. S. Pavan Kumar, Sreelatha, K. S., .S.Roy, M., and Sreekala, C. O., “Improvement in Conversion Efficiency of Dye-sensitized Solar Cells Using Functionalized Multi-wall Carbon Nanotubes in the TiO2 Sensitization Process”, in International Conference in nanotechnology for Sustainable Energy-2010, organized by European Science Foundation (ESF), Innsbruck, Austria, 2010.
2010 Conference Paper C. O. Sreekala, Sreelatha, K. S., and Roy, M. S., “Electrical and Optical Studies of Bulk Hetrojunction Device Based on CuPc and ZnS”, in International conference on Materials for the Millennium (MatCon 2010), University of Science and technology, Kochi, Kerala, 2010.
2010 Conference Paper Y. Janu, Roy, M. S., Sreekala, C. O., and .S.Sreelatha, K., “Enhancement of Photovoltaic Properties by the Surface Treatment of Nanostructured TiO2 in DSSCs using Curcumin Dye as Sensitizer”, in International Conference on Photochemical Conversion on Solar Energy (icpse-2010), Amrita Vishwa Vidyapeetham, Coimbatore, 2010.
2008 Conference Paper C. O. Sreekala, Balraju, P., Deol, Y. S., Pradeep, P., and Roy, M. S., “Photo Response in Zinc Oxide Doped Alizarin Thin Film”, in Thermophysical Properties of Materials and Devices: IVth National Conference on Thermophysical Properties-NCTP'07, 2008.[Abstract]

Hybrid structure based on organic and inorganic materials are emerging as most promising materials for photovoltaic applications. We have designed a hybrid structurc based on Alizarin (1, 2 dihydroxy anthraquinone) and a wide band gap zinc oxide. Alizarin acts as donor and zinc oxide acts as an acceptor material. The device having configuration of ITO/Aln:ZnO/Ag was characterized by analyzing its optical and electrical characteristics. It is found that the doping with zinc oxide imparts an accelerated improvement in device performance particularly in terms of its photo response. Impedance analysis of the device was carried out by recording Cole‐Cole plot in between real and imaginary impedance under biasing varying from 0 to 5 V.

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Publication Type: Conference Proceedings
Year of Conference Publication Type Title
2008 Conference Proceedings K. S. Sreelatha, Roy, M. S., and Sreekala, C. O., “Photoelectrical Properties of Bulk Heterojunction Devices Based on Rose Bengal and TiO2 Nanoparticle”, Proceeding of the International Conference on Solar Cells IC-SOLACE 2008. pp. 390-392, 2008.

 

Faculty Details