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Welcome to Ultrafast Spectroscopy and Optoelectronics Lab (USOL)

PUBLICATIONS

  1. Upadhyay, B.; Maity, D.; Anil, S.; Narayan, T. N.; Pal, S. K. Trnsient Optical Modulation in Vanadium and Selenium Doped MoS2 by Carrier-Carrier and Carrier Phonon Interaction. Advanced Optical Materilas 2401351 (2024).
  2. Kundar, M., Gayen, K., Ray, R., Pal, S. K., & Kushavah, D. Highly Stable Two-dimensional Ruddlesden-Popper Perovskite Based Resistive Switching Memory Devices. Nanoscale (2024).
  3. Soni, A.; Ghosal, S.; Kundar, M.; Pati, S.K.; Pal, S. K. "Long-Lived Interlayer Excitons in WS2/Ruddlesden–Popper Perovskite van der Waals Heterostructures" ACS Appl. Mater. Interfaces, 16 (27), 35841-35851 (2024)
  4. Maity, D., Upadhyay, B., Panda, J. J., Sahoo, K. R., Rajalakshmi, G., Pal, S. K., & Narayanan, T. N. Tuning the valley depolarization dynamics in selenium and vanadium alloyed monolayer MoS2. Physical Review Materials, 8(6), 064004 (2024).
  5. Bhandari, S., Kundar, M., & Pal, S. K. Impact of tin doping on charge carrier dynamics of a two-dimensional lead halide perovskite. Journal of Physics D: Applied Physics, 57(37), 375103 (2024).
  6. Bhandari, S., Kundar, M. Chakraborty, M. Pal, S.K; Exciton dynamics in two-dimensional metal halide perovskite: The impact of film processing. J. Chem. Phys.160 (4): 044709 (2024)
  7. Kundar, M., Kumar, P., Sharma, S.K., Singh, R. and Pal, S.K., Stable Perovskite Solar Cells Based on Direct Surface Passivation Employing 2D Perovskites. Sol. RRL. 7: 2300572 (2023).
  8. Kushavah, D.; Mushtaq, A.; Pal, S. K. Ultrafast and Nonlinear Optical Properties of Two-Dimensional Mo-doped Dual Phase Inorganic Lead Halide Perovskite J. Phys. Chem. C 127, 40, 20014–20025 (2023).
  9. Upadhyay, B.; Sharma, R.; Maity, D.; Narayan, T. N.; Pal, S. K. Ultrafast carrier dynamics in vanadium doped MoS2 alloys Nanoscale 15, 16344-16353 (2023).
  10. Verma, A.; Soni, A.; Sarkar, A. S.; Pal, S. K. Defect-mediated saturable absorption and carrier dynamics in tin(II) monosulfide quantum dots Opt. Lett.", 48, 4641-4644 (2023)
  11. Singh, R.; Kundar, M.; Pal, S. K.; Sharma, S. K. Bandgap Engineered Double-Cation/Double-Halide (DCDH) Quasi-Cubic Perovskite for Highly Efficient (> 36%) Indoor Photovoltaics" IEEE Journal of Photovoltaics (2023)
  12. Kundar, M.; Bhandari, S.; Chung, S.; Cho K.; harma, S.K.; Singh, S.; Pal, S. K. "Surface Passivation by Sulfur-Based 2D (TEA)2PbI4 for Stable and Efficient Perovskite Solar Cells" ACS Omega, 14 12842–12852 (2023).
  13. Soni, A.; Kushavah, D.; Lu, L.-S.; Chang, W.-H.; Pal, S. K. "Efficient Multiple Exciton Generation in Monolayer MoS2" Journal of Physical Chemistry Letters, 14 2965–2972 (2023).
  14. Nagaraju, N., Kushavah, D., Ghosh, S., Pal, S.K. "Photophysical, electrochemical and electron donating properties of rhodanine-3-acetic acid-linked structural isomers" Chemical Physics, 566 111793 (2023).
  15. Mushtaq, A., Pradhan, B., Kushavah, D., Zhang, Y., Naumenko, D., Amenitsch, H., Hofkens, J. and Pal, S.K., "Femtosecond induced third-order optical nonlinearity in quasi 2D Ruddlesden–Popper perovskite film deciphered using Z-scan." Materials Advances., 3, 8211-8219 (2022).
  16. Soni, A., Pal, S. K., Valley Degree of Freedom in Two-Dimensional van der Waals Materials. Journal of Physics D: Applied Physics, 55 303003. (2022).
  17. Upadhyay, B., Thakur, D., Pramanick, B., Bhandari, S., Balakrishnan, V., & Pal, S. K. Anomalous emission behavior of exciton at low temperature in monolayer WS2. Journal of Physics D: Applied Physics, 55 235105 (2022).
  18. Nagaraju, N., Kushavah, D., Kumar, S., Ray, R., Gambhir, D., Ghosh, S., Pal, S.K. "Through structural isomerism: positional effect of alkyne functionality on molecular optical properties." Phys. Chem. Chem. Phys., 24, 3303-3311 (2022).
  19. Sarkar, A. S., Kumari, A., Anchala, Nakka, N., Ray, R., Stratakis, E., & Pal, S. K. "Excitation dependent photoluminescence from quantum confined ultrasmall SnS sheets." Applied Physics Letters 119.24 (2021): 241902.
  20. Soni, A.; Kushavah, D.; Lu, L.-S.; Chang, W.-H.; Pal, S. K. "Ultrafast Exciton Trapping and Exciton–exciton Annihilation in Large-area Cvd-grown Monolayer WS2. The Journal of Physical Chemistry C (2021).
  21. Mushtaq, A., Pradhan, B., Kushavah, D., Zhang, Y., Wolf, M., Schrenker, N., Fron, E., Bals, S., Hofkens, J., Debroye, E., Pal, S.K.; Third-Order Nonlinear Optical Properties and Saturation of Two-Photon Absorption in Lead-Free Double Perovskite Nanocrystals under Femtosecond Excitation. ACS Photonics. (2021).
  22. Wadhwa R., Agrawal A.V., Kushavah D., Mushtaq A., Pal S.K., Kumar M. Investigation of charge transport and band alignment of MoS2-ReS2 heterointerface for high performance and self-driven broadband photodetection. Applied Surface Science. 2021 Aug 20:150949.
  23. Ray, R., Pal, S.K. Solution-Processed Photoinduced Multilevel Resistive Switching Devices Based on Lead-Free All-Inorganic perovskite, IEEE Electron Device Letters. (2021) Jul 5.
  24. Kushavah D., Mushtaq A., Ghosh S., Pal S.K. Ultrafast and nonlinear optical properties of two-dimensional CdSe nanostructures prepared using MoS2 nanosheets as template, Physica E: Low-dimensional Systems and Nanostructures. 2021 Jun 1;130:114682.
  25. Ghosh S., Ray R., Pal S.K. Ultrafast Many-Particle Phenomena in Lead Bromide Hybrid Perovskite Nanocrystals Under Strong Optical Excitation, The Journal of Physical Chemistry C. (2021) Feb 1;125(5):3198-205.
  26. Ray, R., Nakka, N.; Pal, S. K. High-performance perovskite photodetectors based on CH3NH3PbBr3 quantum dot/TiO2 heterojunction, Nanotechnology 2020, 32(8), p.085201.
  27. Kumar, A.; Rao, V. N; Kumar, A.; Mushtaq, A.; Sharma, L.; Halder, A.; Pal, S. K.; Shankar, M. V.; Krishnan, V. Three-Dimensional Carbonaceous Aerogels Embedded with RhSrTiO3 for Enhanced Hydrogen Evolution Triggered by Efficient Charge Transfer and Light Absorption, ACS Appl. Energy Mater. 2020, 3, 12134.
  28. Nariyangadu, S. B.; Choedak, T.; Malar, E. J. P.; Chen, J.; Thyrhaug, E.; Kumar, P.; Zhou, J.; Yechuri, V.; Pal, S. K.; Lidin, S.; Thangadhorai, K. N.; Karki, K. J.; Pullerits, Tönu New Nonlinear Optical Crystal of Rhodamine 590 Acid Phthalate, ACS Omega 2020, 5, 20863.
  29. Ray, R.; Sarkar, A. S.; Pal, S. K. Improving Carrier Transport in Polymer Films by Incorporating MoS2 Nanosheets J. Phys. D: Appl. Phys. 2020, 12, 53(27), 275109
  30. Ghosh, S.; Shi, Q.; Pradhan, B.; Mushtaq, A.; Acharya, S.; Karki, K. J.; Pullerits, T.; Pal, S. K. Light-Induced Defect Healing and Strong Many-Body Interactions in Formamidinium Lead Bromide Perovskite Nanocrystals J. Phys. Chem. Lett. 2020, 11, 1239−1246.
  31. Salam, A. S.; Mushtaq, A.; Kushavah, D; Pal, S. K. Liquid exfoliation of electronic grade ultrathin tin(II) sulfide (SnS) with intriguing optical response NPJ 2D Mater. Appl. 2020,4,1.
  32. Ray, R.; Sarkar, A. S.; Pal, S. K. Improving Performance and Moisture Stability of Perovskite Solar Cells through Interface Engineering with Polymer-2D MoS2 Nanohybrid Sol. Energy 2019, 13, 95.
  33. Pradhan, B; Mushtaq, A; Roy, D; Sain, S: Das, B; Ghorai, U. K.; Pal, S. K.; Acharya, S Mixed-Halide Perovskite Nanocubes into Phase-Stable Single-Crystalline Uniform Luminescent Nanowires J. Phys. Chem. Lett. 2019, 10, 1805−1812.
  34. Mushtaq, A.; Kushavah, D; Ghosh, S.; Pal, S. K.; Nonlinear optical properties of benzylamine lead (II) bromide perovskite microdisks in femtosecond regime. Appl. Phys. Lett. 2019, 114, 051902.
  35. Sarkar, A.S.; Mushtaq, A.; Pal, S.K.; Strong many-body interactions in ultrathin anisotropic tin (II) monosulfide 2019 (arXiv preprint arXiv:1811.00209).
  36. Ghosh, S.; Kushavah, D; Pal, S. K.; Unravelling the Role of Surface Traps on Carrier Relaxation and Transfer Dynamics in Ultrasmall Semiconductor Nanocrystals. J. Phys. Chem. C 2018, 122, 21677.
  37. Ghosh, S.; Shi, Q.; Pradhan, B; Kumar, P.; Wang, Z.; Pal, S. K.; Acharya, Sombrata; Pullerits, T; and Karki, K. J. Phonon Coupling with Excitons and Free Carriers in Formamidinium Lead Bromide Perovskite Nanocrystals. J. Phys. Chem. Lett. 2018, 9, 4245.
  38. Kumar, P.; Ray, R.; Adel, P.; Luebkemann, F.; Dorfs, D.; Pal, S. K. Role of ZnS Segment on Charge Carrier Dynamics and Photoluminescence Property of CdSe@CdS/ZnS Quantum Rods, J. Phys. Chem. C 2018, 122, 6379.
  39. Shi, Q.; Ghosh, S.; Sarkar, A. S.; Kumar, P.; Wang, Z.; Pal, S. K.; Pullerits, T; and Karki, K. J. Variation in the Photocurrent Response Due to Different Emissive States in Methylammonium Lead Bromide Perovskites J. Phys. Chem. C 2018, 122, 3818.
  40. Sarkar, A. S.; Pal, S. K. Phonon Shift in Chemically Exfoliated WS2 Nanosheet, AIP Conf. Proc. 2018, 1942, 90046.
  41. Sarkar, A. S.; Rao A. D.; Jagdish A.K.; Gupta A.; Nandi C. K.; Ramamurthy P. C.; Pal, S. K. Facile embedding of gold nanostructures in the hole transporting layer for efficient polymer solar cells, Organic Electronics, Available online 19 December 2017, ISSN 1566-1199.
  42. Sarkar, A. S.; Pal, S. K. A van der Waals p-n Heterojunction Based on Polymer-2D Layered MoS2 for Solution Processable Electronics, The Journal of Physical Chemistry C 121, no. 40 (2017) 21945.
  43. Ghosh, S.; Pal, S. K.; Karki, K. J.; Pullerits, T. N. Ion Migration Heals Trapping Centers in CH3NH3PbBr3 Perovskite, ACS Energy Letters, 2 (2017) 2133.
  44. Mushtaq, A.; Ghosh, S.; Sarkar, A. S.; Pal, S. K. Multiple Exciton Harvesting at Zero-Dimensional/Two-Dimensional Heterostructures, ACS Energy Letters, 2 (2017) 1879.
  45. Sarkar, A.; Pal, S. K. Electron-Phonon Interaction in Organic/2D-Transition Metal Dichalcogenide Heterojunctions: A Temperature-Dependent Raman Spectroscopic Study, ACS Omega, 2 (2017) 4333.
  46. Ghosh, S.; Ghosh, M.; Kumar, P.; Sarkar, A. S.; Pal, S. K. Quenching of the excitonic emission of ZnO quantum dots due to Auger-assisted hole transfer to CdS quantum dots J. Phys. Chem. C 2016, 120, 27717.
  47. Kumar, P.; Pal, S. K. Ultrafast multiexponential electron injection dynamics at a dye and ZnO QD interface: a combined spectroscopic and first principles study Phys. Chem. Chem. Phys. 2016, 18, 29571.
  48. Kumar, P.; Kumar, S.; Ghosh, S; Pal, S. K. Femtosecond insights into direct electron injection in dye anchored ZnO QDs following charge transfer excitation Phys. Chem. Chem. Phys. 2016, 18, 20672.
  49. Kumar, S.; Singh, P.; Kumar, P.; Srivastava, R.; Pal, S. K.; Ghosh, S. Exploring Emissive Charge Transfer Process in Zero-Twist Donor-Acceptor Molecular Design as Dual State Emitter J. Phys. Chem. C 2016, 120, 12723.
  50. Sarkar, A. S.; Kalyani, V.; Gonsalves, K. E.; Pradeep, C. P., Pal, S. K. Ion mediated charge carrier transport in a novel radiation sensitive polyoxometalate-polymer hybrid RSC Adv. 2016, 6, 44838.
  51. Kumar, P; Pal, S. K. Ab Initio Assessment of the Structural and Optoelectronic Properties of Organic-ZnO Nanoclusters J. Phys. Chem. A 2015, 119, 10067.
  52. Sarkar, A. S.; Pal, S. K.; Exponentially distributed trap-controlled space charge limited conduction in graphene oxide films J. Phys. D: Appl. Phys. 2015, 48, 445501.
  53. Pal, S. K. Versatile photoluminescence from graphene and its derivatives Carbon 2015, 88, 86. (Review Article).
  54. Kalyani, V.; Satyanarayana, V. S. V.; Sarkar, A. S.; Kumar, A.; Pal, S. K.; Ghosh, S.; Gonsalves, K. E.; Pradeep, C. P. A Radiation sensitive hybrid polymer based on anMn-Anderson polyoxometalate cluster and a UV active organic monomer: synergistic effects lead to improved photocurrent in a photoresponse device RSC Adv.2015, 5, 36727.
  55. Kumar, P; Pascher, T; Tachiya, M.; Pal, S. K. Global analysis of quenching of the time-resolved emission of ZnO nanocrystals by adsorbed rhodamine B on the basis of Tachiya theory J. Photobiol. Photochem. A: Chem.2015, 296, 35.
  56. Chakraborti, H.; Pal, S. K. Assessment of amine functionalized graphene nanoflakes for anode materials in Li-Ion batteries: An ab initio study Chem. Phys. Lett. 2014, 600, 118.
  57. Kumar, P.; Pal, S. K. Role of decoupled defect transitions of ZnO nanocrystals in energy transfer J. Photobiol. Photochem. A: Chem.2014, 278, 46.
  58. Chakraborti, H.; Bramhaiah, K.; John, N. S.; Pal, S. K. Excited state electron transfer from aminopyrene to graphene: a combined experimental and theoretical study Phys. Chem. Chem. Phys. 2013, 15, 19932.
  59. Chakraborti, H.; Sinha, S; Ghosh, S; Pal, S. K. Interfacing water soluble nanomaterials with fluorescence chemosensing : graphene quantum dot to detect Hg2+ in 100% aqueous solution Mater. Lett. 2013, 97, 78-80.
  60. Pal, S. K.; Mereshchenko, A. S.; Butaeva, E. V.; El-Khoury, P. Z.; Tarnovsky, A. N. Global sampling of the photochemical reaction paths of bromoform by ultrafast deep-UV through near-IR transient absorption and ab initio multiconfigurational calculations J. Chem. Phys. 2013, 138, 124501.
  61. El-Khoury, P. et al. Towards Controlling Photochemical Reactivity in Small Polyatomic Molecules in Solution: Difluorodiiodomethane EPJ Web of Conferences 41, 05031 (2013).
  62. Tarnovsky, A. N. et al. Short-Time Events, Coherence, and Structural Dynamics in Photochemistry of Aqueous Halogenated Transition Metal Dianions EPJ Web of Conferences 41, 05038 (2013).
  63. Mereshchenko, A. S.; Pal, S. K.; Karabaeva, K. E.; El-Khoury, P.; Tarnovsky, A. N. Photochemistry of Monochloro Complexes of Copper(II) in Methanol Probed by Ultrafast Transient Absorption Spectroscopy J. Phys. Chem. A 2012, 116, 2791.
  64. Pal, S. K.; Mereshchenko, A. S.; El-Khoury, P.; Tarnovsky, A. N. Femtosecond photolysis of CH2Br2 in acetonitrile: capturing the bromomethyl radical and bromine-atom charge transfer complex through deep-to-near UV probing Chem. Phys. Lett. 2011, 507, 69.
  65. Pal, S. K.; Kesti, T.; Maiti, M.; Zhang, F.; Inganas, O.; Hellstrom, S.; Andersson, M. R.; Oswald, F.; Langa, F.; Osterman, T.; Pascher, T.; Yartsev, A.; Sundstrom, V. Geminate Charge Recombination in Polymer/Fullerene Bulk Heterojunction Films and Implications for Solar Cell Function J. Am. Chem. Soc. 2010, 132, 12440.
  66. El-Khoury, P.; Pal, S. K.; Mereshchenko, A. S.; Tarnovsky, A. N. The formation and back isomerization of iso-H2C-Br-Br on a 100-ps time scale following 255-nm excitation of CH2Br2 in acetonitrile Chem. Phys. Lett. 2010, 493, 61.
  67. Pal, S. K.; Sundstrom, V.; Galoppini, E.; Persson, P. Calculations of Interfacial Interactions in Pyrene-Ipa Rod Sensitized Nanostructured TiO2 Dalton Trans. 2009, 10021.
  68. Pal, S. K.; Bhattacharya, S.; Batabyal, S. K.; Ganguly, T. Role of TiO2 nanoparticles on the photoinduced intramolecular electron transfer reaction within a novel synthesized donor-acceptor system J. Photochem. Photobiol. A: Chem. 2007, 189, 86.
  69. Mandal, P.; Sahu, T.; Misra, T.; Pal, S. K.; Ganguly, T. Experimental Investigations by using electrochemical, steady state and time resolved spectroscopic tools on the photoreactions of disubstituted indoles in presence of Tetracyanoquinodimethane (TCNQ) And a Theoretical Approach by Using Time-Dependent Density Functional Theory J. Photochem. Photobiol. A: Chem. 2007, 188, 235.
  70. Ganguly, T.; Pal, S. K. Photoinduced electron transfer research to build model compounds of artificial photosynthesis and solar energy conversion (Review Article) J. Chin. Chem. Soc. 2006, 53, 219.
  71. Pal, S. K.; Batabyal, S. K.; Ganguly, T. Preparation and photophysical properties of nanostructured 9-cyanoanthracene Chem. Phys. Lett. 2005, 406, 420.
  72. Pal, S. K.; Sahu (nee Bhattacharya), T.; Misra, T.; Ganguly, T.; Pradhan, T. K.; De, A. Synthesis, characterization and laser flash photolysis studies of some naphthothiophenes bearing electron donor and acceptor functional groups J. Photochem. Photobiol. A: Chem. 2005, 174, 138.
  73. Sahu (nee Bhattacharya), T.; Pal, S. K.; Misra, T.; Ganguly, T. Involvements of phenyldibenzophosphole and 9-phenylcarbazole in electron transfer reactions with photoexcited 9-cyanoanthracene J. Photochem. Photobiol. A: Chem. 2005, 171, 39.
  74. Pal, S. K.; Sahu (nee Bhattacharya), T.; Misra, T.; Mallick, P. K.; Paddon-Row, M. N.; Ganguly, T. Experimental Investigation by Laser Flash Photolysis To Reveal the Optical and Electron-Donating Properties of Benzothiazole Derivatives and a Theoretical Approach by Using Time-Dependent Density Functional Theory J. Phys. Chem. A 2004, 108, 10395.
  75. Bhattacharya, T.; Pal, S. K.; Misra, T.; Saini, R. D.; Ganguly, T. Primary electron-transfer dynamics in 2-phenylindole-9- cyanoanthracene system-A comparative study with 2-methylindole Spectrochim. Acta Part A 2004, 60, 1957.
  76. Pal, S. K.; Bhattacharya, T.; Misra, T.; Saini, R. D.; Ganguly, T. Photophysics of Some Disubstituted Indoles and Their Involvements in Photoinduced Electron Transfer Reactions J. Phys. Chem. A 2003, 107, 10243.
  77. Misra, T.; Bhattacharya, T.; Pal, S. K.; De, A.; Saini, R. D.; Ganguly, T. The fate of charge separation reactions within a novel synthesized bichromophore in b cyclodextrin microenvironment Chem. Phys. Lett. 2003, 382, 167.
  78. Misra, T.; De, A. K.; Pal, S. K.; Bhattacharya, T.; Ganguly, T. Photophysical properties of 5-hydroxyindole (5HI): Laser flash photolysis study Proc. Indian Acad. Sci. (Chem. Sci.) 2002, 114, 547.

PRESENTATIONS IN CONFERENCES/ INSTITUTES

Poster:
  1. Soni, A., Pal, S. K., "Carrier multiplication in layered MoS2" at the "9th Theme Meeting on Ultrafast Sciences 2021 (UFS-2022),IISER Thirivanantpuram, Kerla, India", Nov. 03-05th, 2022.
  2. Soni, A., Pal, S. K., "Trapping and annihilation of excitons in large area monolayer WS2: an ultrafast spectroscopic insight" at the "Graphene-2022, Aachen,Germany", July 05-08th, 2022.
  3. Mushtaq, A., Pal, S. K., "An insight into saturation of two-photon absorption in lead free double perovskite nanocrystals" at the "9th Theme Meeting on Ultrafast Sciences 2021 (UFS-2022), IISER Thirivanantpuram, Kerla, India", Nov. 03-05th, 2022.
  4. Soni, A., Pal, S. K., "Understanding the role of exciton-exciton annihilation and exciton trapping on carrier relaxation in large area monolayer WS2" at the "Virtual Online Workshop - Light-Matter Interactions in Low Dimensional and Topological Photonic Materials", Jan 27-28 and Jan 31-Feb 01, 2022.
  5. Soni, A., Pal, S. K., “Exciton Dynamics in Large Area Monolayer WS2 Probed by Femtosecond Transient Absorption Spectroscopy” at the "7th Theme Meeting on Ultrafast Sciences 2021 (UFS-2021)" Dates: November 12 - 14, 2021: Venue: On-line Zoom Platform.
  6. Sarkar A. S. and Pal S. K., Solvent Exfoliation of Ultrathin Two-Dimensional Tin (II) Sulfide (SnS) for Optoelectronic Applications in the 2017 MRS Fall Meeting and Exhibits, Boston, Massachusetts, USA, 26th November to 1stDecember, 2017.
  7. Ghosh, S.; Pal, S. K. Auger-assisted hole transfer from photoexcited ZnO to CdS quantum dots in the 28th International conference on photochemistry (ICP 2017), University of Strasbourg, France, July 16-21, 2017.
  8. Sarkar, A. S.; Saxena, P.; Gupta, A.; Nandi, C. K.; Gupta, V.; Chand, S.; Pal, S. K. Plasmonic modified graphene oxide interface layer for polymer photovoltaic devices in the Foundation day of NPL, New Delhi.
  9. Sarkar, A. S.; Pal, S. K. Electrical conduction of as prepared and annealed multilayer graphene oxide thin films: A comparative study in the 8th India Singapore Symposium in Condensed Matter Physics, IIT Kanpur, February 25-27, 2015.
  10. Kumar, P.; Pal, S. K. Ultrafast Charge Transfer in Dye Sensitized ZnO Quantum Dot in the International Conference on Frontiers of Spectroscopy, BHU, January 10-12, 2015.
  11. Chakraborti, H.; Pal, S. K. Enhancement of Dye Emission in the Presence of Graphene Oxide in the National Fluorescence Workshop (FCS 2012), SINP and IICB Kolkata, December 3-7, 2012.
  12. Kumar, P.; Pal, S. K. Quenching of Visible Photoluminescence of ZnO Nanocrystals by Rhodamine B in the National Fluorescence Workshop (FCS 2012), SINP and IICB Kolkata, December 3-7, 2012.
  13. El-Khoury, P. et al. Towards Controlling Photochemical Reactivity in Small Polyatomic Molecules in Solution: Difluorodiiodomethane in the XVIIIth International Conference on Ultrafast Phenomena, 8 - 13 July 2012, Lausanne, Switzerland.
  14. Tarnovsky, A. N. et al. Short-Time Events, Coherence, and Structural Dynamics in Photochemistry of Aqueous Halogenated Transition Metal Dianions in the XVIIIth International Conference on Ultrafast Phenomena, 8 - 13 July 2012, Lausanne, Switzerland.
  15. Chakraborti, H.; Pal, S. K. Photoinduced Interactions Between Fluorescein Dye and Graphene in the National Symposium on Nanobiotechnology, IIT Mandi, June 1-2, 2012.
  16. Kumar, P.; Pal, S. K. Quenching of Defect Emission of ZnO Quantum Dot in the Presence of Fluorescein Dye in the National Symposium on Nanobiotechnology, IIT Mandi, June 1-2, 2012.
  17. Pal, S. K.; Pascher, T.; Yartsev, A.; Sundstrom, V. Fullerene Dependent Carrier Dynamics in Polymer/Fullerene Bulk Heterojunction Films in the National Symposium on Radiation & Photochemistry (NSRP - 2011), JNV University, Jodhpur, Rajasthan, March 10-12, 2011.
  18. Pal, S. K.; El-Khoury, P.; Mereshchenko, A. S.; Tarnovsky, A. N. Ultrafast Photochemistry of bromoform in solution probed in the deep-UV to near-IR spectral rangein the 3rd Asia Specific Symposium on Radiation Chemistry and 10th Bienniel Trombay Symposium on Radiation and Photochemistry, Treasure Island Resorts, Lonavala, India, September 14-17, 2010.
  19. Pal, S. K.; Pascher, T.; Yartsev, A.; Sundstrom, V. Dynamics of photogenerated charge carriers in polymer/fullerene blendsin the8th Nordic Femtochemistry Meeting, Fuglso Conference Center, Denmark, 2-4 October, 2008.
  20. Osterman, T; Pal, S. K.; Pascher, T.; Yartsev, A.; Sundstrom, V. Fluorescence studies of low-bandgap polyfullerene/PCBM blends: the mechanism of light-induced charge formationin STRUCTURAL DYNAMICS: METHODS AND APPLICATIONS at Algarve (Portugal), June 5-8, 2008.
  21. Pal, S. K.; Ganguly, T. Photoinduced electron transfer reaction between a novel synthesized donor-acceptor system and TiO2 nanoparticles in the National Conference on Photosciences, Jadavpur University, Kolkata, India.
  22. Pal, S. K.; Misra, T. Photophysics and electron donating properties of 5-hydroxyindole (5HI)inTrombay Symposium on Radiation and Photochemistry, Centaur Hotel, Juhu Beach, Mumbai, India, January 6-11, 2002.
Oral:
  1. Nanoscale Transition Metal Dichalcogenides: A Future for Electronic Applications in the EMCA 2017, NIT Durgapur, Durgapur, March 15-17, 2017.
  2. Polymer-MoS2 Nanoheterojuctions for Solution Processable Electronics in the NCRAMSS 2017, Shri Mata Vaishno Devi University, Katra, February 15-17, 2017.
  3. Nanoscale Polymer Grafted-MoS2 for Optoelectronic Applications in the IUMRS-ICYRAM 2016, IISC Bangalore, December 13-15, 2016.
  4. Carrier Dynamics in Dye Anchored Quantum Dots (QDs): Femtosecond Insights in the Theme Meeting of Ultrafast Sciences UFS-2015, November 19-21, SNBNCBS Kolkata.
  5. Time-Resolved Spectroscopic Studies on Photoexcited Processes in Composites of Graphene and Semiconductor Nanomaterials with Organic Molecules in the International Conference on Frontiers of Spectroscopy, BHU, January 10-12, 2015.
  6. Photoinduced Processes in Graphene and Semiconductor Nanocrystals Based Materials: Spectroscopic and First-Principles Studies in the 8th Asian Photochemistry Conference, Tirvandram, November 10-13,2014.
  7. Properties of Graphene Derivatives Relevant to Electronic Applications: Spectroscopic Studies in the National Workshop on Advanced Materials, IIT Mandi, May 27-28, 2014.
  8. Chemically Tuned Graphene Oxide for Optoelectronic Applications in the Vidyasagar-Satyendranath Bose National Workshop 2014 on Physics of Advanced Optical Materials and Photonics, SOS University, Bhubaneswar, March 26-28, 2014.
  9. Femtosecond transient absorption: a wonderful tool to study the dynamics of photovoltaic processes in the short term course on Introduction to Photonics and Its Applications, NIT Durgapur, July 29- August 02, 2013.
  10. Organic Photovoltaic Materials in the Workshop on Current Challenges in Novel materials, IIT Mandi, April 27, 2012.
  11. Plastic Solar Cells: Science, Expectations, and Challenges in the First In-House Symposium on Inter-Disciplinary Research and Development, IIT Mandi, May 7, 2011.
  12. Charge carrier dynamics in conjugated polymer/fullerene bulk heterojunction films in the Centre for Energy Studies, IIT Delhi, February 18, 2011.
  13. Ultrafast Photochemistry of bromoform in solution probed in the deep-UV to near -IR spectral range in the 65th OSU International Molecular Spectroscopy Symposium Department of Chemistry,The Ohio State University, Columbus, Ohio 43210 USA, June 21-25, 2010.
  14. Life cycle of charges in conjugated polymer/fullerene blends in the Dept. of Optical Spectroscopy of Conjugated Materials, Max Planck Institute for Polymer Research, Mainz, Germany, January 16, 2009.
  15. Enhancement of longevity of photogenerated charge separated species in b-Cyclodextrin microenvironment in the Fourth Asian Photochemistry Conference at Grand Hotel, Taipei, Taiwan, January 5-10, 2005.