Dr. Palas Roy Assistant Professor
School of Basic Sciences

Research Interests

Photodynamics in Molecules and Materials
Time-resolved Emission and Absorption Spectroscopy
Time-resolved Vibrational Spectroscopy

Photodynamics of Next-genertation Optoelectronic Materials

Efficient Control and Harvesting Photo-generated Carriers

Contact Details

  • SBS 233
  • palasroy@iitbbs.ac.in

Other Profile Link(s)


 Degree Discipline Year School
  BSc Chemistry (Hons) 2006-2009 Krishnath College (University of Kalyani))
  MSc Chemistry 2009-2011 Indian Institute of Technology Kharagpur
  PhD Experimental Physical Chemistry 2011-2017 Tata Institute of Fundamental Research (TIFR) Mumbai


Dr. Palas Roy has joined IIT Bhubaneswar as an Assistant Professor in the School of Basic Sciences (Chemistry). He is a native of Berhampore (Murshidabad) in West Bengal. He did his BSc (Chemistry Honours) from Krishnath College Berhampore (University of Kalyani). He further went on to complete his MSc (Chemistry) from IIT Kharagpur and pursued his Ph.D. from Tata Institute of Fundamental Research Mumbai (TIFR). His dissertation focused on the “Probing the Fate of Excitons in Organic Semiconductors”. His research interests include developing femtosecond spectroscopic tools to characterise excited state in organic semiconductors. Dr. Palas Roy has also worked as a Postdoctoral Research Fellow at Northwestern University, USA and Senior Research Associate at the University of East Anglia (UEA), UK. His postdoctoral work focused on developing femtosecond spectroscopic tools for studies of molecular photoswitches and dimers.


He received several awards for securing university topper position during BSc. His PhD was selected for the “2018 IUPAC-Solvay International Award for Young Chemists” (one of five winners worldwide) and “2019-Best PhD thesis award at TIFR”. He received Travel Grant from the Royal Society of Chemistry (RSC) for attending an international conference (HOPV-2016) in the UK. His postdoctoral work at UEA received a “2021-Special Merit in Research Award” and oral presentation at several international conferences.


At IIT Bhubaneswar, Dr. Roy plans to investigate photodynamics in next-generation energy materials using time-resolved spectroscopy and provide design principle to improve their efficiency. Current focus of his Photodynamics Resaerch (PR) group is to control and efficiently harvest photogenearted triplet and charges.


Group Theory and Spectroscopy (MSc Spring 2022-23)
Chemistry (BTech Spring 2022-23, Autumn 2023-24)
Chemistry Laboratory (BTech Autumn 2023-24)


Control and Harvest of photogenerated singlet, triplet and charges in novel Optoelectronic materials 

Recent Publications (International Journals)

1Palas Roy, ≠ Andy S. Sardjan,≠ Wojciech Danowski, Wesley R. Browne, Ben. L. Feringa@ and Stephen R. Meech@; “Control of Photoconversion Yield in Unidirectional Photomolecular Motors by Push-Pull Substituents” J. Am. Chem. Soc. X. xxxx (2023) DOI: 10.1021/jacs.3c06070 (≠equal contribution)
2Pragya Verma, Mariusz Tasior, Palas Roy, Stephen R. Meech@, Daniel T. Gryko, and Eric Vauthey@; “Excited-state Symmetry Breaking in Quadrupolar Pull-push-pull Molecules: Dicyanovinyl vs. Cyanophenyl Acceptors” Phys. Chem. Chem. Phys. (2023 Advance Article)
3Palas Roy, Wesley R. Browne, Ben. L. Feringa@ and Stephen R. Meech@; 'Ultrafast motion in a third generation photomolecular motor' Nature Communications 14. 1253 (2023) DOI: 10.1038/s41467-023-36777-6 (Editors’ Highlight)
4Kiri Addison, Palas Roy, Giovanni Bressan, Karolina Skudaite, Josh Robb, Philip B. C. Page, Eleanor K. Ashworth, James N. Bull and Stephen R. Meech@; “Photophysics of the Red-form Kaede Chromophore” Chemical Science, (2023, Just Accepted) DOI: 10.1039/D3SC00368J
5Palas Roy, Faisal Al-Kahtani, Andrew N. Cammidge, and Stephen R. Meech@; “Solvent Tuning Excited State Structural Dynamics in a Novel Bianthryl”, J. Phys. Chem. Lett. X, XX (2023) DOI: 10.1021/acs.jpclett.2c03469
6Palas Roy, Gokul T. Anandan, Nagaraj Nayak, Anil Kumar, and Jyotishman Dasgupta@; “Raman Snapshots of Side-Chain Dependent Polaron Dynamics in PolyThiophene Films” J. Phys. Chem. B X, XX (2023). DOI: 10.1021/acs.jpcb.2c06185
7Giovanni Bressan, Michael Jirasek, Palas Roy, Harry Anderson, Stephen R. Meech@ and Ismael Heisler@;“Population and Coherence Dynamics in Large Conjugated Porphyrin Nanorings”, Chem. Sci. 13, 9624 (2022). DOI: 10.1039/D2SC01971J
8Palas Roy, Andy S. Sardjan, Arjen Cnossen, Wesley R. Browne, Ben. L. Feringa@ and Stephen R. Meech@; “Excited State Structure Correlates with Efficient Photoconversion in Unidirectional Motors” J. Phys. Chem. Lett. 12, 3367 (2021). DOI: 10.1021/acs.jpclett.1c00710
9Palas Roy, Giovanni Bressan, Jacob Gretton, Andrew N. Cammidge, and Stephen R. Meech@; “Ultrafast Excimer Formation and Solvent Controlled Symmetry Breaking Charge Separation in the Excitonically Coupled Subphthalocyanine Dimer” Angew. Chem. Int. Ed. 60, 10568 (2021). DOI: 10.1002/anie.202101572
10Palas Roy, Andy S. Sardjan, Wojciech Danowski, Wesley R. Browne, Ben. L. Feringa@ and Stephen R. Meech@; “Photophysics of First-Generation Photomolecular Motors: Resolving Roles of Temperature, Friction, and Medium Polarity” J. Phys. Chem. A. 125, 1711 (2021). DOI: 10.1021/acs.jpca.0c11050
11Palas Roy@ “Hot-carriers in Organic Photovoltaics” Pure Appl. Chem. 93, 223 (2021). DOI: 10.1515/pac-2020-1001 (Invited article)
12Dale Green, Palas Roy, Christopher R. Hall, James N. Iuliano, Garth A. Jones, Andras Lukacs, Peter J. Tonge and Stephen R. Meech@; “Excited State Resonance Raman of Flavin Mononucleotide: Comparison of Theory and Experiment” J. Phys. Chem. A. 125, 6171 (2021). DOI: 10.1021/acs.jpca.1c04063
13Palas Roy@, and Jyotishman Dasgupta; “Temporal Probing of Excitons in Organic Semiconductors” Pure Appl. Chem. 92, 707 (2020). DOI:10.1515/pac-2018-1230 (Invited article)
14Andy S. Sardjan, Palas Roy, Giovanni Bressan, Laura Comprido, Wesley R. Browne, Ben. L. Feringa@ and Stephen R. Meech@; “Ultrafast Excited State Dynamics in a First Generation Photomolecular Motor” ChemPhysChem 21, 594 (2020). DOI: 10.1002/cphc.201901179 (Journal Cover Feature)
15Shawn Irgen-Gioro, Palas Roy, Suyog Padgaonkar, and Elad Harel@; “Low Energy Excited State Vibrations Revealed in Conjugated Co-Polymer PCDTBT” J. Chem. Phys. 152, 044201 (2020). DOI:10.1063/1.5132299
16KC Krishnapriya≠, Palas Roy≠, Ulrike Salzner, Jyotishman Dasgupta@ and Satish Patil@; “Spin Density Encodes Intramolecular Singlet Fission in Pentacene Dimers” Nat. Commun. 10, 1 (2019). DOI: 10.1038/s41467-018-07736-3 (≠equal contribution)
17Palas Roy, Shreetama Karmakar, and Jyotishman Dasgupta@; “Femtosecond Stimulated Raman Spectroscopy” Book Chapter-9 in “Molecular and Laser Spectroscopy: Advances and Applications” by Prof. V. P. Gupta, Elsevier 193-215 (2018). DOI:10.1016/B978-0-12-849883-5.00009-7
18Palas Roy, Ajay Jha, Vineeth B. Yasarapudi, Thulasi Ram, Boregowda Puttaraju, Satish Patil and Jyotishman Dasgupta@; “Ultrafast bridge planarization in donor-π-acceptor copolymers drives intramolecular charge transfer” Nat. Commun. 8, 1 (2017). DOI: 10.1038/s41467-017-01928-z
19Melby Johny, K. Vijayalakshmi, Ankita Das, Palas Roy, Aseem Mishra and Jyotishman Dasgupta@; “Modulating Phe-Phe dipeptide aggregation landscape by covalent attachment of an Azobenzene photoswitch” Chem. Commun. 53, 9348 (2017). DOI: 10.1039/C7CC04106C
20Tushita Mukhopadhyay, Boregowda Puttaraju, Palas Roy, Jyotishman Dasgupta, Andreas Meyer, Alexander Rudnick, Steffen Tscheuschner, Frank-Julian Kahle, Anna Köhler, and Satish Patil@; “Facile Synthesis and Chain-length Dependent Optical and Structural Properties of Diketopyrrolopyrrole-based Oligomers” Chem. Eur. J. 23, 13718 (2017). DOI: 10.1002/chem.201702131
21Palas Roy, Ajay Jha, and Jyotishman Dasgupta@; “Photoinduced Charge Generation Rates in Soluble P3HT:PCBM Nano-aggregates Predict the Solvent-dependent Film Morphology” Nanoscale 8, 2768 (2016). DOI: 10.1039/C5NR06445G

Conferences (International)

12023 Time-resolved Vibrational Spectroscopy; Invited Talk on 'Molecular Movies: Ultrafast Raman Snapshots of Unidirectional Motors?'
22019 IUPAC World Chemistry Congress, Paris; Posters presentation “Probing the Fate of Exciton in Organic Semiconductors”.
32016 International Conference on Hybrid and Organic Photovoltaics-2016, Swansea, UK; Oral presentation “Tracking Exciton Dynamics in Low-Bandgap Conjugated Polymers using Femtosecond Stimulated Raman Spectroscopy”.
42016 International Conference on Optics Within Life Sciences, TIFR/IITB, India
52014 Advances in Spectroscopy and Ultrafast Dynamics-2014 symposium, IACS, Kolkata, India; Poster presentation “Capturing Photoinduced Charge Transfer States of P3HT:PCBM Mixtures in Solution”.
62012 Workshop at 23rd International Conference on Raman Spectroscopy, IISC-Bangalore, India

Conferences (National)

12023 Kaleidoscope: A Discussion Meeting in Chemistry; Invited Talk on 'Can Ultrafast Science Help Optimise Unidirectional Motor Performance?'
22022 Chemistry Research Day, UEA; Oral presentation 'Ultrafast Charge Separation in Covalently Linked Anthracene Dimer'
32021 Chemistry Research Day, UEA; Oral presentation “Ultrafast Raman Snapshot of Unidirectional Motors in Motion”.
42021 Chemistry Seminar Series, UEA; Oral presentation “Ultrafast photophysics of molecular dimers”.
52020 Chemistry Research Day, UEA; Oral presentation “Excited state structural correlation for efficient photoconversion in artificial motors”.
62016 TIFR-DCS annual talks, India; Posters presentations “Ultrafast Exciton and Charge Dynamics in Organic Semiconductors” and “Tracking Singlet Fission in Semiconducting Organic Nanoparticles”.
72016 National Conference on Recent Advances in Optical Sciences-II, Hyderabad, India; Oral presentation “Photoinduced Charge Generation Rates in Soluble P3HT:PCBM Nano-aggregates Predict the Solvent Dependent Film Morphology”.
82016 National Workshop on Fluorescence and Raman Techniques, TIFR, India
92016 Modern Trends in Electron Transfer Chemistry: From Molecular Electronics to Devices, ICTS, Bangalore, India; Poster presentation “Tracking Exciton Dynamics in Low Band-gap Conjugated Polymers using Femtosecond Stimulated Raman Spectroscopy”.
102013 FCS Satellite Confocal Workshop-2013, IISC-Bangalore, India

Academic Honors & Awards

  • Special Merit in Research Award, University of East Anglia, UK (https://sites.google.com/view/2021researchersummit/special-merit-winners).
  • Best PhD Thesis, Department of Chemical Sciences (DCS), TIFR, India.
  • IUPAC-Solvay International Award for Young Chemists, One of the five winners worldwide for my PhD thesis at TIFR, India (https://iupac.org/winners-2018-iupac-solvay-international-award-young-chemists/).
  • Best Poster Prize, Annual Meeting of Department of Chemical Sciences (DCS), TIFR, India (judged by Prof. Martin Gruebele, University of Illinois-Urbana Champaign).
  • Travel Grant by Royal Society of Chemistry (RSC) for attending international conference on Hybrid and Organic Photovoltaics-2016 (HOPV-16), Swansea, UK.
  • Qualified NET Research Fellowship in Chemical Sciences (JRF 57)
  • Qualified GATE in Chemistry (rank-9)
  • Medal & Certificate for University Topper in BSc Chemistry (Hons), University of Kalyani, India.
  • Medal & Certificate of Merit In Memory of Prof. D.N. Roy, University of Kalyani, India.
  • Medal & Certificate of Merit for Excellence in Chemistry Hons., University of Kalyani, India.
  • Medal & Certificate of Merit In Memory of Prof. Khagendra Chandra Karmakar, University of Kalyani, India.

Research Scholar

Postdoctoral candidates
Currently PR group does not have funded postdoctoral opportunities. However, any prospective candidates can apply for NPDF fellowships. If you are interested, please send the resumes and a brief summary of research interests to palasroy@iitbbs.ac.in
PhD students
Currently PR group has one PhD student and is looking to recruit interested and motivated candidates. The projects will be focused on the photodynamics study in emerging energy materials. If you are interested, kindly send the resumes to palasroy@iitbbs.ac.in

Professional Experience

2023-Till Date          Assistant Professor, IIT Bhubaneswar (IITBBS), Odisha, India                                                                                   2019-2023               Senior Research Associate, University of East Anglia (UEA), Norwich, UK                                                            2018-2019               Postdoctoral Research Fellow, Northwestern University (NU), Illinois, US                          


2023      Faculty Advisor (MSc Chemistry, ITEP Chemistry and BTech), IITBBS
2023      School Exam Coordinator (School of Basic Sciences) for Spring end-semester BTech exam, IITBBS
2023      Liaison Officer for Hon'ble MP Shri Biplab Kumar Deb during IIT Council Meeting 2023 at IITBBS
2023      Faculty Coordinator for G20-Open Day Exhibition at IITBBS
2023      Faculty Trainer for improving presentation skill of final year PhD students at IIT Bhubaneswar
2016-Till date Reviewed research papers from different international Physical Chemistry journals
2016      Involved in organising the international conference on ‘Optics within Life sciences 2016’ at TIFR
2013-17 Demonstrated basic science experiments using femtosecond laser systems to school students during the annual science outreach programme ‘Frontiers of Sciences’ at TIFR-Mumbai

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