Ph.D. (Cochin University of Science and Technology)
Joined SCMS School of Engineering and Technology, Karukutty on 03.05.2021
Post-Doctoral Fellow at CUSAT (17.07.2019 - 02.05.2021)
DST Research Project Fellow at CUSAT (17.04.2012 to 07.03.2013)
KSCSTE Research Project Fellow at U.C. College, Aluva (22.03.2011-16.04.2013)
Key Responsibilities Held
Responsibilities Held - During Post –Doctoral Research
One among the conveners of International Conference, MatCon-2021
Handled labs for integrated M.Sc. Students during Post-Doctoral period
Handling classes for B. Tech students for semester I and II
Thin Film Photovoltaics
Nanomaterials for optoelectronic applications
Implementing ZnO nanomaterials in P3HT:PCBM based hybrid solar cell. R. Geethu, K. S. Ranjith, R.T. Rajendra Kumar, K. P. Vijayakumar Published in “Advanced polymeric systems: Applications in nanostructured materials, composites and biomedical fields”, Chapter 3, 2021, River Publishers (Thomason Reuters Book Citation Index indexed); ISBN: 978-87-7022-136-8 (Hardback), 978-87-7022-135-1 (Ebook), Editors : Didier Rouxel, K. M. Praveen, Indu Raj, Sandhya Gopalakrishnan, Nandakumar Kalarikkal, Sabu Thomas. (Peer Reviewed).
Investigation on structural, optical and optoelectronic properties of thin film GaSe, CuGaSe, CuInGaSe Geethu R, Binitha.S, Leena.C.M, Neema Raveendran, Rary Varghese Koottala, Dhanya.S, Lyjo.K.Joseph, Rachel Reena Philip, published in a proceedings of UGC sponsored national level seminar “Modern Trends in Electronic Communication and Signal Processing”, ISBN :978-93-80697-73-4
Journal publications – UGC approved
A novel, facile and efficient two step hydrothermal route for WS2 nanosheets and its optimistic exposure as competent industrial level sonocatalyst, Santhosh M V; R. Geethu; Devaky K S (Accepted Journal of Materials Science: Materials in Electronics, 2021)
Overcoming consistency constrains of ITO/ZnO/P3HT:PCBM/Ag solar cell by open air annealing and its systematic stability study under inborn conditions R. Geethu, Santhosh, C. Sudha Kartha, K. P. Vijayakumar, Journal of Materials Science: Materials in Electronics, 30 (2019) 18981–18989.
Eco-friendly and non-toxic thin film solar cell employing spray pyrolysed p-CZTS and n-SnS: Cu—a novel approach Gisa Grace Ninan, M. R. Rajesh Menon, R. Geethu, D. R. Deepu, C. Sudha Kartha, K. P. Vijayakumar, Journal of Materials Science: Materials in Electronics, 29 (23) (2018) 20455-20461.
Improving the performance of ITO/ZnO/P3HT:PCBM/Ag solar cells by tuning the surface roughness of sprayed ZnO. R. Geethu, C. Sudha Kartha, K.P. Vijayakumar Solar Energy, 120 (2015) 65–71.
Control of interconnected ZnO nanowires to vertically aligned ZnO nanorod arrays by tailoring the underlying spray deposited ZnO seed layer. K. S. Ranjith, R. Geethu, K. P. Vijayakumar, R. T. Rajendrakumar Materials Research Bulletin, 60 (2014) 584–588.
Spray pyrolysed microporous TiO2 thin films by optimization of substrate temperature for all sprayed solar cells. M. V. Santhosh, D. R. Deepu, R. Geethu, C. Sudha Kartha, K. P. Vijayakumar. Semiconductor Science and Technology, 29 (11) (2014) 115026.
Optoelectronic and Thermoelectric properties in Ga Doped ?-PbS2 nanostructured thin films. R. Geethu, Rajani Jacob, T. Shripathi, G. S. Okram, V. Ganesan, Shilpa Tripathi, Anees Fatima, Sreenivasan P.V, Urmila K.S, B. Pradeep, Rachel Reena Philip, Applied Surface Science, 258 (17) (2012) 6257–6260.
Structural, optical, electrical and low temperature thermoelectric studies on the ordered vacancy compound AgGa3Se5. Rajani Jacob, R. Geethu, T. Shripathi, G. S. Okram, V. Ganesan, B. Pradeep, K. S. Urmila and Rachel Reena Philip, physica status solidi (b), 249(6) (2012) 1271-1276
Structural studies and valence band splitting parameters in ordered vacancy compound AgGa7Se12 Rajani Jacob, R. Geethu, T. Shripathi, V. Ganesan, U. P. Deshpande, Shilpa Tripathi, B. Pradeep, Rachel Reena Philip, Journal of Inorganic and Organometallic Polymers and Materials, 23 (2) (2012) 424-431.
Optoelectronic and Low temperature thermoelectric effects in the OVC n-CuIn3Se5 thin films. Rajani Jacob, R. Geethu, T Shripathi, G S Okram, V Ganesan, B.Pradeep, Urmila K.S and Rachel Reena Philip, physica status solidi (a), 209(11) (2012) 2195-2200.
Conference Publication- UGC approved
Solar Cells With High Open Circuit Voltage Using Thiophene Based Synthesized Copolymer R. Geethu, C. P. Anjali, K. Sreekumar, C. Sudha Kartha, K. P. Vijayakumar, AIP Conf. Proc. 2082, 050002 (2019)
On the improvement of photovoltaic action of ZnO/P3HT:PCBM by roughness of window layer Geethu R, M. R. Rajesh Menon, C. Sudha Kartha, K. P. Vijayakumar, AIP Conf. Proc. 1591, 636 (2014)
Preparation and Characterization Of Solar Cell Of A Novel Configuration ITO/n-OVC/p-CIS/In. Geethu R, Dhanya S, Rajani Jacob, Sreenivasan P.V, T. Shripathi and Rachel Reena Philip, AIP Conf. Proc. 1447, 1065 (2012).
The Effect of Ga Doping on the Physical Properties of Lead Sulphide Thin Films, Reshmi Radhakrishnan, Hiba Rahman, Dhanya S., Geethu R, Nafsia Karim, Faseela K, Sreenivasan P.V, Pradeep B, Rachel Reena Philip, AIP Conf. Proc. 1391, 585-587 (2011).
Other Conference Publications
Fabrication and characterization of photovoltaic cell with novel configuration ITO/n-CuIn3Se5/p-CIS/In Geethu R, Rajani Jacob, Sreenivasan P. V., Shripathi T., Okram G. S. and Racheal Reena Philip, IOP Conf. Series: Materials Science and Engineering 73, 012057 (2015)
Micro/nano structured inorganic materials for hybrid solar cell application, Geethu R, K. Sreekumar and K. P. Vijayakumar., “INVITED TALK” on International Online Conference on Nano Materials (ICN 2021) held at Mahatma Gandhi University, Kottayam, Kerala during 09th-11th April 2021.
Copper tin sulphide ? Possibilities in the field of clean green energy, Geethu, R., Sreekumar, K., Virtual International Conference on Surface Chemistry, SUCH-2020, 27-28 August 2020, Annamalai University, Tamil Nadu.
An attempt towards all sprayed organic solar cell, Geethu R., Sreekumar, K., Vijaykumar, K. P., STAM 2020, 14-16 January, Mar Athanasius College, Kothamangalam
Hybrid solar cells based on P3HT:PCBM: Effect of different solvents and blend ratio on device performance, R. Geethu., C. Sudha Kartha, K. P. Vijayakumar, National seminar, ASCII 2018, 14-16 February, Department of Instrumentation, CUSAT, Kochi
Modification in ZnO morphology and device architecture for improving ZnO/P3HT:PCBM solar cell performance, R. Geethu, K. S. Ranjith, R.T. Rajendra Kumar, K. P. Vijayakumara, International conference ICAPM 2017, 7-9 April, Department of Chemistry, M. G. University, Kottayam.
P3HT:PCBM Thin Film Deposition Using Spray Technique For Solar Cell Application: Optimizing Spray Condition, R. Geethu., C. Sudha Kartha, K. P. Vijayakumar, National conference CTric 2017, 2-3 February, Department of Applied Chemistry, CUSAT
ITO/ZnO/P3HT:PCBM/Ag Solar Cell Prepared Under Ambient Atmosphere: Effect Of Air Annealing, R. Geethu, C. Sudha Kartha, K. P. Vijayakumar, Kerala Science Congress 2017, 29-30 January, Mar Thoma College Thiruvalla
Surface modification of transparent ZnO thin film by controlling temperature and spray rate of CSP technique for solar cell application, R. Geethu, C. Sudha Kartha and K. P. Vijayakumar, National Conference, TriPS 2015, 30-31 July, Sree Sankara College, Kalady.
A Comparative Study Of Micro Sprayed And Spin Coated P3HT:PCBM Thin Films For Optoelectronic Applications, R. Geethu, C. Sudha Kartha, K. Rajeev Kumar and K. P. Vijayakumar, International conference, ICEEE 2015, 5-7 February, organized by CUSAT, Cochin-22.
Study on device performance of ITO/ZnO/Polymer/Ag using polymers, MEHPPV and P3HT, R. Geethu, C. Sudha Kartha, K.P. Vijayakumar, International conference, ICSET 2014, 11-13 Dec at PSG College, Coimbatore.
A comparative study on the optoelectronic properties of Ga doped nanostructured films of CdS and PbS, Geethu R, Rajani Jacob, Anees Fatima, Shilpa Tripathi, T.Shripathi and Rachel Reena Philip, Third International conference on frontiers in nanoscience and technology, Cochin nano 2011 held on 14-17 August, at Cochin organised by CUSAT.
Preparation and characterization of GaSe, CuGaSe and CuInGaSe thin films, Geethu R, Binitha.S, Leena.C.M, Neema Raveendran, Rary Varghese Koottala, Dhanya.S, Lyjo.K.Joseph, Rachel Reena Philip, International Conference on Recent Trends in Material Science and Technology (ICMST), held on 29-31 October, 2010 at Thiruvananthapuram organised by IIST.
Morphological, Compositional and Optoelectronic properties of nanostructured Silver Selenide thin films, Rajani Jacob, Geethu R, T.Sripathi, V.Ganesan, Rachel Reena Philip, UGC sponsored National seminar on Emerging Trends in Optoelectronics and Solar energy Nanomarerials, EOSN-2011, Pazhassi Raja NSS college, Mattannur.
Optoelectronic properties of nanostructured AgGaSe2 thin film, Rajani Jacob, Geethu R, Rachel Reena Philip, UGC sponsored National seminar on Challenges in Nanoscience and Technology, CNT-2011, July 28-29, 2011, organised by St. Teresa’s College, Ernakulam.
Awards and Honours
Awardee of UGC-BSR - Research Fellowship in Science for Meritorious Students during doctoral degree period.
Chaired a session in the International Online Conference on Nano Materials (ICN 2021) held at Mahatma Gandhi University, Kottayam, Kerala during 09th-11th April 2021.
Technical programs attended
National workshop on Energy Materials (EM-2014), organized by Department of Physics, CUSAT
National workshop on Current Trends in Applied Physics (CTAP)- 2015, organized by Department of Physics, CUSAT
UGC-sponsored workshop on Material Characterization Tools and Techniques (2015), organized by CAM and Department of Physics, CUSAT
National workshop on Technology for Aged (NWTA-2015), organized by Centre for Enabling Technology for Aged, CUSAT
Post Graduate Diploma in Computer Application (PGDCA)
Certificate in Computer Application (CCA) – NOS, Govt. of India, New Delhi