Department of Chemical Physics

Weizmann Institute of Science

Perlman Chemical Science Building, Room 617

Email: tapiphysics@gmail.com

tapan-kumar.das@weizmann.ac.il

Web: http://tapiphysics.wixsite.com/tapandas/research

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I. Academic qualifications

• Post-doctoral fellow, Weizmann Institute of Science, Israel (2019-till date)

• Research Associate, Indian Institute of Technology Bombay, Powai, India (2018-2019)

• PhD in Physics with 8.15 CGPA, Indian Institute of Technology Madras, Chennai, India. PhD Dissertation (2018) on “Structural, optical and microstructural properties of TiO2 photoanode and (Cd,Zn)Se quantum dots for sensitized solar cells”

• M.Phil. Physics 1st Div. with 77 %, Ravenshaw University, Cuttack (India).

• M.Sc. Physics 1st Div. with 77 %, Ravenshaw University, Cuttack (India).

• B. Sc. Honors in Physics 1st Div. with 68 %, Kendrapara College, Utkal University, Bhubaneswar, (India).

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II. Academic Honors and Funding

• Qualified Graduate Aptitude Test in Engineering (GATE) 2012.

• A life time member of Electron Microscope Society of India (EMSI), Affiliated to International Federation of Societies for Microscopy.

• Recipient of Student project funding from “Research Scholar Innovative Student Project (RSIP) 2015-2016” by Center for IC & SR, IIT Madras

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​III. Academic Awards

• Recipient of Institute Research Award, IIT Madras :2018-2019: Best research scholars who has done excellent research work.

• Recipient of Mrs. Abayambal & Mr. Natarajan Award-2018:2018-2019: Best Ph.D. thesis in Energy/Physics.

• Recipient of Bhagyalakshmi & Krishna Ayengar Award:2018-2019: Best project in the field of Solar & alternative energy application.

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IV. Skills and Research Expertise: ​

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• Experience in interdisciplinary projects of material science, physics and chemistry involving spin dependent electron transfer through chiral molecules and semiconductor materials in spintronic device, particularly for Magnetoresistance and spin Hall device.

• Expertise on the fabrication of spintronic device in clean room facilities using mask aligner, Micro writer, photolithography workstation, thermal evaporator, atomic layer deposition (ALD), RF sputtering and wire bonder.

• Expertise on fabrication of sensitized solar cell and quantum dot light emitting devices.

• Extensive study the microstructure and structure of semiconductor nanostructures using high resolution transmission electron microscope (HRTEM) and Raman spectroscope.

• Skilled in various characterization techniques;

  • Thin film techniques: Photolithography (mask aligner, MA6), MicroWriter (ML3 Pro), thermal evaporator (ODEM evaporator), ALD (FIJI F200), RF sputtering (AJA sputtering), anodization, doctor-blade and electrophoretic deposition.

  • Electrical and Magnetic studies: Resistivity, photoconductivity, magnetoresistance and Hall measurement.

  • Microscopy: HRTEM (FEI TITAN 300 kV, FEI Tecnai F20, Phillips CM12), FESEM (Quanta 400, Quanta 200, InspectF, FEI), FEI Versa 3D Dual-beam SEM. (Institute operator of HRTEM and FESEM for 3 years)

  • Spectroscopy: Raman, UV/Visible absorption, circular dichroism (CD), PL, XRD, EPR, Diffuse reflectance. (Department Raman spectroscopy operator for one year)

  • Electrical and magnetic studies: Magnetoresistance, photoconductivity, Hall device.

  • Solar cell characterization techniques: IV-measurement, QE, EIS, OCVD. 

• Semiconductor electronic properties analysis: Experience in analyzing of magnetoresistance at room temperature and cryogenic temperature (4K) and resistivity of semiconductor materials at room temperature and cryogenic temperature (70K).

• Computer Skills and the software analysis: PeakFit (for EELS, Raman and XPS spectral profile fitting), Rietveld refinement, EIS spectral simulation, Vesta (crystal structure modeling), Origin, Photoshop, Microsoft office, crystallographic design. Digital micrograph design.

• Organizer: Organized an event titled on “An Open Day on Optics (2016)” a lecture series, demo and lab visit, an one day workshop on Research Scholars Day (2015), and organize an one day workshop on “Photovoltaic: Fundamentals, Device Characterization, Simulation and Emerging Concepts (2018)” in the department of physics Indian Institute of Technology, Madras, India.

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V. Publications:

1. Tapan Kumar Das, P. Ilaiyaraja, Pavana S.V. Mocherla, G.M. Bhalerao, C. Sudakar, “Influence of surface disorder, oxygen defects and bandgap in TiO2 nanostructures on the photovoltaic properties of dye sensitized solar cells” Solar Energy Materials & Solar Cells 144 (2016) 194–209.

2. Tapan Kumar Das, P. Ilaiyaraja, C. Sudakar, “Coexistence of strongly and weakly confined energy levels in (Cd,Zn)Se quantum dots: Tailoring the near-band-edge and defect-levels for white light emission” Journal of Applied Physics 121, 183102 (2017)

3. P. Ilaiyaraja, Tapan Kumar Das, Pavana S.V. Mocherla and C. Sudakar, “Well-connected Microsphere-Nanoparticulate TiO2 Composites as High Performance Photoanode for Dye Sensitized Solar Cell” Solar Energy Materials & Solar Cells 169 (2017) 86–97.

4. Tapan Kumar Das, P. Ilaiyaraja, and C. Sudakar, “Template assisted nanoporous TiO2 nanoparticles: The effect of oxygen vacancy defects on photovoltaic performance on DSSC and QDSSC” Solar Energy 159 (2018) 920-929.

5. Tapan Kumar Das, P. Ilaiyaraja, and C. Sudakar, “Whispering-gallery mode assisted enhancement in the power conversion efficiency of DSSC and QDSSC devices using TiO2 microsphere photoanodes” ACS Appl. Energy Mater., 1 (2018) 765–774.

6. P. Ilaiyaraja, Benadict Rakesh, Tapan Kumar Das, Pavana S.V. Mocherla and C. Sudakar “CuInS2 Quantum Dot Sensitized Solar Cells with High Voc » 0.9V achieved using Microsphere-Nanoparticulate TiO2 Composite Photoanode” Solar Energy Materials & Solar Cells 178 (2018) 208–222.

7. Tapan Kumar Das, P. Ilaiyaraja, and C. Sudakar, “Whispering Gallery Mode Enabled Efficiency Enhancement: Defect and Size Controlled CdSe Quantum Dot Sensitized Whisperonic Solar Cells” Scientific Reports, 8 (2018) 9709.

8. P. Ilaiyaraja, Tapan Kumar Das, Pavana S.V. Mocherla and C. Sudakar “Optical Whispering Gallery Enabled Enhanced Photovoltaic Efficiency of CdS-CuInS2 Thin Film Sensitized Whisperonic Solar Cells” Journal of Physical Chemistry C, 123 (2019) 1579-1586.

9. C. Sudakar, Tapan Kumar Das and P. Ilaiyaraja, “Whisperonic Solar Cells” EU PVSEC Proceedings 2018, DOI: 10.4229/35thEUPVSEC20182018-1AO.3.5.

10. Sumit Kumar Sharma, Chinmay Phadnis, Tapan Kumar Das, Balasubramaniam Kavaipatti, Arindam Chowdhury, Aswani Yella, “Reversible Dimensionality Tuning of Hybrid Perovskites with Humidity: Visualization and Application to Stable Solar Cells” Chemistry of Materials, 31, (2019), 9, 3111-3117.

11. Vikas Sharma, Tapan Kumar Das, P. Ilaiyaraja and C. Sudakar “Oxygen non-stoichiometry in TiO2 and ZnO nano rods: Effect on the photovoltaic properties of Dye and Sb2S3 sensitized solar cells” Solar Energy 191, (2019) 400-409.

12. Debjit Manna, Tapan Kumar Das, Aswani Yella, “Tunable and Stable White Light Emission in Bi3+ Alloyed Cs2AgInCl6 Double Perovskite Nanocrystals” Chemistry of Materials, 31, (2019), 24, 10063-10070.

13. Athrey C D, Tapan Kumar Das, P. Ilaiyaraja and C. Sudakar, “Quantum Dot Sensitized Whisperonic Solar Cells -Improving Efficiency Through Whispering Gallery Modes” Frontiers in Materials, 6, (2019), 282, 1-8.

14. Chidambar Kulkarni, Amit Kumar Mondal, Tapan Kumar Das, Gal Grinbom, Francesco Tassinari, Mathijs F. J. Mabesoone, E. W. Meijer, and Ron Naaman, “Highly Efficient and Tunable Filtering of Electrons Spin by Supramolecular Chirality of Nanofiber‐Based Materials” Advanced Materials, 2020, 1904965.

15. Vikas Sharma, Tapan Kumar Das, P. Ilaiyaraja and C. Sudakar, “Growth of Sb2S3 Semiconductor Thin Film on Different Morphologies of TiO2 Nanostructures” (Under review in Materials Research Bulletin, Submission no: MRB_2020_34).

16. Debjit Manna, Jiban Kangsabanik, Tapan Kumar Das, Debashish Das, Aftab Alam and Aswani Yella, “Lattice Dynamics and Electron-Phonon Coupling in Lead-Free Cs2AgIn1-xBixCl6 Double Perovskite Nanocrystals” (Under review in The Journal of Physical Chemistry Letters, Manuscript ID: jz-2020-002068).

Patents:

1. C. Sudakar, Tapan Kumar Das, P. Ilaiyaraja, (Intellectual Property India) “Tailoring of blue, green, green-red emission from inorganic crystalline (Cd,Zn)Se quantum dots – ZnSe amorphous phase composite for white light emitting diode application” Application number 201641030043.

2. C. Sudakar, Tapan Kumar Das, P. Ilaiyaraja, “The effect of Whispering-gallery modes (WGMs) on the power conversion efficiency of DSSC and QDSSC devices using TiO2 microsphere photoanode” (IN Patent App. TEMP/E-1/440/2018-CHE).

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Conferences Participated:

Talks:

1. International Conference on Electron Microscopy and XXXVI Annual Meeting of EMSI-2015, July 8-10, 2015, Bhabha Atomic Research Centre, Mumbai, India.

2. In house symposium 2015, Department of Physics, IIT Madras held on 14th Nov 2015.

3. In house symposium 2016, Department of Physics, IIT Madras held on 17th Nov 2016.

Posters presentations:

1. IUMRS - ICA 2013, Indian Institute of Science, Bangalore, India. Titled on “Microstructural and optical studies on ordered and disordered porous TiO2 nanostructures”.

2. International Conference on Electron Microscopy and XXXV Annual Meeting of EMSI-2014, Delhi University, Delhi, India. Titled on “TEM studies on CdSe Quantum Dot sensitized TiO2 nanostructures”.

3. International Conference on Electron Microscopy and XXXV Annual Meeting of EMSI-2014, Delhi University, Delhi, India. Titled on “Sb2S3 – TiO2 nanostructure for photovoltaic applications”.

4. 2015 MRS meeting & Exhibi-2015, San Francisco, California. Titled on “Optimizing TiO2-CdSe interface for enhancing the photovoltaic response of nanostructured solar cell”.

5. ICMAT2015 & IUMRS-ICA2015, Suntec, Singapore Titled on “Nanoporous TiO2 by Dextran Templating for Efficient Dye and Quantum Dot Sensitized Solar Cell”.

6. A workshop-seminar bringing the Nanoworld Together-2015, IIT Madras. Titled on “Defect activated photoluminescence studies of CdSe and Zn doped CdSe quantum dots”.

7. International Conference on Electron Microscopy and XXXVII Annual Meeting of EMSI-2016, Department of Metallurgical Engineering, IIT (BHU), Varanasi, UP, India. Titled on “Compositional and microstructural investigations of CdSe QDs alloys and core-shell structures”.

8. IUMRS-ICEM2016, Suntec, Singapore. Titled on “Effect of Zn metal ion on the emission and phonon vibration of CdSe QDs”.

9. 2016 MRS Fall Meeting & Exhibit-2016 in Boston, Massachusetts. Titled on “(Cd,Zn)Se Based Quantum Dot Sensitized Solar Cells Through Bandgap Engineering”.

10. International Conference on Electron Microscopy and XXXVIII Annual Meeting of EMSI-2017 Confluence Banquets & Resorts, Tamilnadu, India. Tittle on “Quantum Dot Sensitized Solar Cell: Efficient Light Harvesting Through Band-gap Engineering of CdSe and Using Composite-TiO2 Photoanode”.

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