Photosciences and Photonics : Narayanan Unni K N » Publications & Conferences

    Publications

  1. Swetha Sasidharan, Anooja Jagadeesh, Sourava C Pradhan, Balagopal N Nair, Abdul Azeez Peer Mohamed, KN Narayanan Unni, Suraj Soman, Unnikrishnan Nair Saraswathy Hareesh, ZnO hierarchical structures as sacrificial inclusions for enhanced performance under full sun and indoor light in bifacial dye sensitized solar cells, Solar Energy 2021, 226, 214-224.
  2. Vibhu Darshan, VR Rajeev, KN Narayanan Unni, Enhanced performance of room temperature ammonia sensors using morphology-controlled organic field-effect transistors, Organic Electronics 2021,106280
  3. Solanki, A.; Awasthi, A.; Unni, K. N. N.; Deepak, An efficient and facile method to develop defect-free OLED displays. Semicond Sci Tech 2021, 36 (6).
  4. Kamenan, K. A.; Jagadeesh, A.; Kre, N. R.; Assanvo, E. F.; Soman, S.; Unni, K. N. N., Natural rubber (Hevea Brasiliensis)-based quasi-solid electrolyte as a potential candidate for arresting recombination and improving performance in aqueous dye- sensitized solar cells (Apr, 10.1007/s10854-021-05979-3, 2021). J Mater Sci-Mater El 2021, 32 (11), 14217-14217.
  5. Kamenan, K. A.; Jagadeesh, A.; Kre, N. R.; Assanvo, E. F.; Soman, S.; Unni, K. N. N., Natural rubber (Hevea Brasiliensis)-based quasi-solid electrolyte as a potential candidate for arresting recombination and improving performance in aqueous dye-sensitized solar cells. J Mater Sci-Mater El 2021, 32 (11), 14207-14216.
  6. Narayanan, A. P.; Unni, K. N. N.; Surendran, K. P., Aerogels of V2O5 nanowires reinforced by polyaniline for electromagnetic interference shielding. Chem Eng J 2021, 408.
  7. Rajeev, V. R.; Paulose, A. K.; Unni, K. N. N., Ammonia gas detection using field-effect transistor based on a solution-processable organic semiconductor (vol 158, pg 271, 2018). Vacuum 2021, 184.
  8. Sasidharan, S.; Pradhan, S. C.; Jagadeesh, A.; Nair, B. N.; Mohamed, A. A. P.; Unni, K. N. N.; Soman, S.; Hareesh, U. N. S., Bifacial Dye-Sensitized Solar Cells with Enhanced Light Scattering and Improved Power Conversion Efficiency under Full Sun and Indoor Light Conditions. Acs Appl Energ Mater 2020, 3 (12), 12584-12595.
  9. Manuraj, M.; Jyothilakshmi, S.; Unni, K. N. N.; Rakhi, R. B., MoSe(2)nanoflowers as efficient electrode materials for supercapacitors. J Mater Sci-Mater El 2020, 31 (22), 20571-20577.
  10. Manuraj, M.; Chacko, J.; Unni, K. N. N.; Rakhi, R. B., Heterostructured MoS2-RuO2 nanocomposite: A promising electrode material for supercapacitors. J Alloy Compd 2020, 836.
  11. Kakekochi, V.; Gangadharappa, S. C.; Nikhil, P. P.; Chandrasekharan, K.; Darshan, V.; Unni, K. N. N.; Dalimba, U. K., Butterfly-Shaped Thiophene-Pyridine Hybrids: Green Electroluminescence and Large Third-Order Optical Nonlinearities. Chempluschem 2020, 85 (8), 1762-1777.
  12. Hanna, B.; Manuraj, M.; Surendran, K. P.; Unni, K. N. N., Opto-electronic properties of solution-processed zinc oxide thin films: role of solvents and doping. J Mater Sci-Mater El 2020, 31 (16), 13570-13577.
  13. Manuraj, M.; Nair, K. V. K.; Unni, K. N. N.; Rakhi, R. B., High performance supercapacitors based on MoS2 nanostructures with near commercial mass loading. J Alloy Compd 2020, 819.
  14. Soman, A.; Sajeev, A. K.; Rajeev, K.; Unni, K. N. N., Reversible Shift from Excitonic to Excimer Emission in Fluorescent Organic Light-Emitting Diodes: Dependence on Deposition Parameters and Electrical Bias. Acs Omega 2020, 5 (3), 1698-1707.
  15. Hemavathi, B.; Jayadev, V.; Ramamurthy, P. C.; Pai, R. K.; Unni, K. N. N.; Ahipa, T. N.; Soman, S.; Balakrishna, R. G., Variation of the donor and acceptor in D-A-pi-A based cyanopyridine dyes and its effect on dye sensitized solar cells. New J Chem 2019, 43 (39), 15673-15680.
  16. Mohan, K. N. M.; Unni, K. N. N.; Rakhi, R. B., 2D organic-inorganic hybrid composite material as a high-performance supercapacitor electrode. Vacuum 2019, 166, 335-340.
  17. Allison, I.; Lim, H.; Shukla, A.; Ahmad, V.; Hasan, M.; Deshmukh, K.; Wawrzinek, R.; McGregor, S. K. M.; Clegg, J.; Divya, V. V.; Govind, C.; Suresh, C. H.; Karunakaran, V.; Unni, K. N. N.; Ajayaghosh, A.; Namdas, E. B.; Lo, S. C., Solution Processable Deep-Red Phosphorescent Pt(II) Complex: Direct Conversion from Its Pt(IV) Species via a Base-Promoted Reduction. Acs Appl Electron Ma 2019, 1 (7), 1304-1313.
  18. Soman, A.; Unni, K. N. N., Enhancement in electron transport and exciton confinement in OLEDs: role of n-type doping and electron blocking layers. Eur Phys J-Appl Phys 2019, 86 (1).
  19. Deepthi, K.; Amal, R. R. B.; Rajeev, V. R.; Unni, K. N. N.; Gowd, E. B., Directed Assembly of Hierarchical Supramolecular Block Copolymers: A Strategy To Create Donor Acceptor Charge-Transfer Stacks. Macromolecules 2019, 52 (7), 2889-2899.
  20. Malov, V. V.; Ghosh, T.; Nair, V. C.; Maslov, M. M.; Katin, K. P.; Unni, K. N. N.; Tameev, A. R., Hole mobility in thieno[3,2-b]thiophene oligomers. Mendeleev Commun 2019, 29 (2), 218-219.
  21. Santhini, P. V.; Jayadev, V.; Pradhan, S. C.; Lingamoorthy, S.; Nitha, P. R.; Chaithanya, M. V.; Mishra, R. K.; Unni, K. N. N.; John, J.; Soman, S., Indolo[3,2-b]indole donor-based D–A dyes for DSCs: investigating the role of -spacers towards recombination. New J Chem 2019, 43 (2), 862-873.
  22. Rajeev, V. R.; Paulose, A. K.; Unni, K. N. N., Ammonia gas detection using field-effect transistor based on a solution-processable organic semiconductor. Vacuum 2018, 158, 271-277.
  23. Hemavathi, B.; Jayadev, V.; Pradhan, S. C.; Gokul, G.; Jagadish, K.; Chandrashekara, G. K.; Ramamurthy, P. C.; Pai, R. K.; Unni, K. N. N.; Ahipa, T. N.; Soman, S.; Balakrishna, R. G., Aggregation induced light harvesting of molecularly engineered D-A-pi-A carbazole dyes for dye-sensitized solar cells. Sol Energy 2018, 174, 1085-1096.
  24. Remya, R.; Gayathri, P. T. G.; Unni, K. N. N.; Deb, B., Physicochemical Studies on Nafion (R) Modified ZnO Interlayers for Enhanced Electron Transport in the Inverted Polymer Solar Cells. Chemistryselect 2018, 3 (35), 9995-10001.
  25. Krishna, A.; Darshan, V.; Suresh, C. H.; Unni, K. N. N.; Varma, R. L., Solution processable carbazole derivatives for dopant free single molecule white electroluminescence by room temperature phosphorescence. J Photoch Photobio A 2018, 360, 249-254.
  26. Soman, A.; Manuraj, M.; Unni, K. N. N., Addressing the efficiency roll-off in a fluorescent OLED by facile electron transport layer doping and carrier confinement. Opt Mater 2018, 79, 413-419.
  27. Thurakkal, S.; Soman, A.; Unni, K. N. N.; Joseph, J.; Ramaiah, D., Simple solution processable carbazole-oxadiazole hybrids for un-doped deep-blue OLEDs. J Photoch Photobio A 2018, 358, 192-200.
  28. Thurakkal, S.; Sanju, K. S.; Soman, A.; Unni, K. N. N.; Joseph, J.; Ramaiah, D., Design and synthesis of solution processable green fluorescent D-pi-A dyads for OLED applications. New J Chem 2018, 42 (7), 5456-5464.
  29. Okamura, N.; Maeda, T.; Fujiwara, H.; Soman, A.; Unni, K. N. N.; Ajayaghosh, A.; Yagi, S., Photokinetic study on remarkable excimer phosphorescence from heteroleptic cyclometalated platinum(II) complexes bearing a benzoylated 2-phenylpyridinate ligand. Phys Chem Chem Phys 2018, 20 (1), 542-552.
  30. Hanna, B.; Surendran, K. P.; Unni, K. N. N., Low temperature-processed ZnO thin films for p-n junction-based visible-blind ultraviolet photodetectors. Rsc Adv 2018, 8 (65), 37365-37374.
  31. Sasidharan, S.; Soman, S.; Pradhan, S. C.; Unni, K. N. N.; Mohamed, A. A. P.; Nair, B. N.; Saraswathy, H. U. N., Fine tuning of compact ZnO blocking layers for enhanced photovoltaic performance in ZnO based DSSCs: a detailed insight using beta recombination, EIS, OCVD and IMVS techniques. New J Chem 2017, 41 (3), 1007-1016.
  32. Sharma, R. K.; Katiyar, M.; Rao, I. V. K.; Unni, K. N. N.; Deepak, Effect of the electric field during annealing of organic light emitting diodes for improving its on/off ratio. Phys Chem Chem Phys 2016, 18 (4), 2747-2755.
  33. Unni, K. N. N.; Majumdar, H. S.; Nambuthiry, M. A. G., Organic Electronics. Int J Photoenergy 2013, 2013.
  34. Uttwani, P. K.; Villari, B. C.; Unni, K. N. N.; Singh, R.; Awasthi, A.; Deepak, Detection of Physical Defects in Full Color Passive-Matrix OLED Display by Image Driving Techniques. J Disp Technol 2012, 8 (3), 154-161.
  35. Singh, R.; Unni, K. N. N.; Solanki, A.; Deepak, Improving the contrast ratio of OLED displays: An analysis of various techniques. Opt Mater 2012, 34 (4), 716-723.
  36. Samal, G. S.; Unni, K. N. N.; Bharat, S.; Deepak, Improved Performance of a Fluorescent Blue Organic Light Emitting Diode with Hole Blocking Materials as Dopants for Transport Layers. Tms 2010 139th Annual Meeting & Exhibition – Supplemental Proceedings, Vol 3: General Paper Selections 2010, 41-45.
  37. Samal, G. S.; Unni, K. N. N.; Bharat, S.; Gupta, S.; Deepak, Improved efficiency in fluorescent blue organic light emitting diode with a carrier confining structure. Org Electron 2009, 10 (7), 1201-1208.
  38. Unni, K. N. N.; Dabos-Seignon, S.; Pandey, A. K.; Nunzi, J. M., Influence of the polymer dielectric characteristics on the performance of pentacene organic field-effect transistors. Solid State Electron 2008, 52 (2), 179-181.
  39. Pandey, A. K.; Unni, K. N. N.; Nunzi, J. M., Pentacene/Perylene co-deposited solar cells. Thin Solid Films 2006, 511, 529-532.
  40. Alem, S.; Pandey, A. K.; Unni, K. N. N.; Nunzi, J. M.; Blanchard, P., Molecular model T6 : C-60 bulk-heterojunction solar cells. J Vac Sci Technol A 2006, 24 (3), 645-648.
  41. Unni, K. N. N.; Pandey, A. K.; Alem, S.; Nunzi, J. M., Ambipolar organic field-effect transistor fabricated by co-evaporation of pentacene and N,N ‘-ditridecylperylene-3,4,9,10-tetracarboxylic diimide. Chem Phys Lett 2006, 421 (4-6), 554-557.
  42. Unni, K. N. N.; Dabos-Seignon, S.; Nunzi, J. M., Influence of the polymer dielectric characteristics on the performance of a quaterthiophene organic field-effect transistor (vol 41, pg 317, 2006). J Mater Sci 2006, 41 (6), 1865-1871.
  43. Tyagi, P. K.; Misra, A.; Unni, K. N. N.; Rai, P.; Singh, M. K.; Palnitkar, U.; Misra, D. S.; Le Normand, F.; Roy, M.; Kulshreshtha, S. K., Step growth in single crystal diamond grown by microwave plasma chemical vapor deposition. Diam Relat Mater 2006, 15 (2-3), 304-308.
  44. Unni, K. N. N.; Dabos-Seignon, S.; Nunzi, J. M., Influence of the polymer dielectric characteristics on the performance of a quaterthiophene organic field-effect transistor. J Mater Sci 2006, 41 (2), 317-322.
  45. Unni, K. N. N.; Pandey, A. K.; Nunzi, J. M., N-channel organic field-effect transistors using N,N ‘-ditridecylperylene-3,4,9,10-tetracarboxylic diimide and a polymeric dielectric. Chem Phys Lett 2005, 407 (1-3), 95-99.
  46. Unni, K. N. N.; Dabos-Seignon, S.; Nunzi, J. M., Improved performance of pentacene field-effect transistors using a polyimide gate dieletric layer. J Phys D Appl Phys 2005, 38 (8), 1148-1151.
  47. Unni, K. N. N.; de Bettignies, R.; Dabos-Seignon, S.; Nunzi, J. M., A nonvolatile memory element based on a quaterthiophene field-effect transistor. Mater Lett 2005, 59 (10), 1165-1168.
  48. Unni, K. N. N.; de Bettignies, R.; Dabos-Seignon, S.; Nunzi, J. M., A nonvolatile memory element based on an organic field-effect transistor. Appl Phys Lett 2004, 85 (10), 1823-1825.
  49. Unni, K. N. N.; de Bettignies, R.; Dabos-Seignon, S.; Nunzi, J. M., The memory effect of a pentacene field effect transistor with a polarizable gate dielectric. Proc Spie 2004, 5351, 166-+.
  50. Titus, E.; Singh, M. K.; Unni, K. N. N.; Tyagi, P. K.; Dua, A. K.; Roy, M.; Misra, D. S., Diamond nucleation and growth on zeolites. Diam Relat Mater 2003, 12 (10-11), 1647-1652.
  51. Unni, K. N. N., Optical characterization of europium diphthalocyanine thin films. Mater Lett 2003, 57 (15), 2215-2218.
  52. Titus, E., M. K. Singh, K.N. Narayanan Unni, P. K. Tyagi, D. S. Misra, Microporous diamond films on zeolites by CVD technique, Solid State Physics (India) 2003, 45,189
  53. Umesh Palnitkar, V.S.Shirodkar, Manoj K. Singh, Elby Titus, P.K.Tyagi, K.N.N. Unni, D.S.Misra, P.Ayuub, and D.K.Avasthi, Effect of heavy ion irradiation on self supported diamond sheets, Diam and Relat Mater 2003, 12,1771.
  54. Joseph, C. M.; Unni, K. N. N.; Menon, C. S., Static induction transistor characteristics of organic copper phthalocyanine films. Mater Lett 2001, 50 (1), 18-20.
  55. Unni, K. N. N.; Menon, C. S., Investigations on sandwich structures of metal-free phthalocyanine (H2Pc) thin films using gold electrodes. Indian J Pure Ap Phy 2001, 39 (3), 159-162.
  56. Unni, K. N. N.; Menon, C. S., Electrical and optical studies on metal-free phthalocyanine thin films. J Mater Sci Lett 2001, 20 (13), 1207-1209.
  57. Unni, K. N. N.; Menon, C. S., Electrical and optical studies on europium diphthalocyanine thin films. J Mater Sci Lett 2001, 20 (13), 1203-1205.
  58. Unni, K. N. N.; Menon, C. S., Electrical and optical studies on nickel phthalocyanine thin films. J Mater Sci Lett 2000, 19 (22), 2003-2005.
  59. Unni, K. N. N.; Menon, C. S., Electrical, optical and structural studies on nickel phthalocyanine thin films. Mater Lett 2000, 45 (6), 326-330.
  60. Unni, K. N. N.; Menon, C. S., Studies on the transport properties of nickel phthalocyanine thin films using gold electrodes. Solid State Physics, Vol 41, 1998 1999, 466-467.
  61. N. Narayanan Unni and C. S. Menon, Grain size determination of vacuum evaporated thin films of nickel phthalocyanine, Asian Journal of Physics, 1997 6, 417
    Conferences (International)

  • OLED Display Fabrication, Defect Detection and Light Outcoupling, Deepak, K. N. Narayanan Unni, Boby C Villari, A. Awasthi, P. Uttwani, A. Solanki (Invited talk, ICLA-2012, Hyderabad, February 2012)
  • New processing technique of photolithography to make defect-free organic light emitting diode display, K. N. Narayanan Unni, Deepak, R. Singh, A. Awasthi, A. Solanki, International workshop on physics of semiconductor devices, IIT Kanpur, Dec 19-22, 2011
  • Design and optimization of a silver based microcavitynfor organic light emitting diode, R. Singh, V. Shukla, K. N. Narayanan Unni, International workshop on physics of semiconductor devices, IIT Kanpur, Dec 19-22, 2011
  • Improved Performance of a Fluorescent Blue Organic Light Emitting Diode with Hole Blocking Materials as Dopants for Transport Layers, G S Samal, K. N. Narayanan Unni, S Bharat, Deepak, TMS Annual Meeting 2010, Feb 14-18, 2010, Seattle, USA
  • Optimization of oxygen plasma process parameters for organic light emitting diode displays, K. N. Narayanan Unni, A. Awasti, J. Harshitha, S. S. Bhagwat, ASID-06, October 8-12, New Delhi, India
  • Pentacene-perylene codeposited solar cell, A. K. Pandey, K. N. N. Unni and J.-M. Nunzi, E-MRS 2005 Spring meeting, May 31-June 3, Strasbourg, France
  • Improved performance of organic nano-composite solar cells with reverse bias annealing A. K. Pandey, K. N. N. Unni, H. Wang, C. C. Oey, A. B. Djurisic, M. H. Xie, Y. H. Leung, K. K. Y. Man, W. K. Chan, P. C. Chui and J. -M. Nunzi, 10th International Conference ERPOSE , 10-15 July 2005, Cargese, France
  • Influence of polymer dielectric characteristics on the performance of a pentacene organic field-effect transistor K. N. Narayanan Unni, Ajay K. Pandey, Sylvie-Dabos Seignon, Jean-Michel Nunzi, Photonics 2004, Jan 9-11, Cochin, India
  • Memory effect of a pentacene field effect transistor with a ferroelectric polymer as gate insulator K. N. Narayanan Unni, Remi de Bettignies, Sylvie Dabos-Seignon, Jean-Michel Nunzi, Photonics west (SPIE) 2004, Jan 25-29, San Jose USA
  • Microporous diamond films on zeolites, E. Titus, M. K. Singh, K. N. N. Unni, P. K. Tyagi and D. S. Misra, 8th International Conference: New Diamond Science and Technology 2002,21-26 July, Melbourne, Australia
  • Effect of heavy ion irradiation on self supported diamond sheets, U. Palnitkar, V.S.Shirodkar, M. K. Singh, E. Titus, P. K. Tyagi, K. N. N. Unni, D.S.Misra, P. Ayuub, and D. K. Avasthi, 8th International Conference: New Diamond Science and Technology 2002, 21-26 July, Melbourne, Australia
  • Memory effect of a quaterthiophene organic field effect transistor with a polarizable dielectric K. N. Narayanan Unni, Remi de Bettignies, Sylvie Dabos-Seignon, Jean-Michel Nunzi, Materials Research Society Symposium, April 12-15, 2004, San Francisco, USA