1. I. Vijitha, N. Raveendran, S. Poovattil, N. Jacob, C. Vijayakumar,* B. Deb*; Studies on the Doping Mechanism of Conjugated Thienothiophene Polymer/MWCNT Hybrids for Thermoelectric ApplicationMacromol. Mater. Eng. 2022, 2100916.

  2. J. K. Pious, C. Muthu, C. Vijayakumar*; Organic Spacer Cation Assisted Modulation of the Structure and Properties of Bismuth Halide PerovskitesAcc. Chem. Res. 2022, 55, 3, 275–285.

  3. A. Ajayakumar, C. Muthu, A. V. Dev, J. K. Pious, C. Vijayakumar*; Two-Dimensional Halide Perovskites: Approaches to Improve Optoelectronic Properties; Chem. Asian J. 2022, 17, e202101075.

  4. C. Muthu, J. K. Pious, T. Thankachan, N. Krishna, C. Vijayakumar*; Stable and Efficient White Photoluminescence from Cesium Lead Halide Perovskite Nanocrystals/ Polyfluorene Organogel Composite by Suppressing of Halide Ion Migration; Adv. Opt. Mater. 2021, 2100601.

  5. J. K. Pious, M. G. Basavarajappa, C. Muthu, R. Nishikubo, A. Saeki, S. Chakraborty, A. Takai, M. Takeuchi, C. Vijayakumar; Self-Assembled Organic Cations-Assisted Band-Edge Tailoring in Bismuth-Based Perovskites for Enhanced Visible Light Absorption and Photoconductivity; J. Phys. Chem. Lett. 2021, 12, 5758-5764.

  6. I. Vijitha, N. Raveendran, P. Arjun,  T. P. Yuvaraj, C. Vijayakumar*, B. Deb*; MWCNT/Thienothiophene based All-Organic thermoelectric composites: Enhanced performance by realigning of the Fermi level through dopingChem. Eng. J. 2021 409, 128294. 

  7. C. Muthu, A. N. Resmi, J. K. Pious, G. Dayal, N. Krishna, K. B. Jinesh,* C. Vijayakumar*; Resistive Switching in Formamidinium Lead Iodide Perovskite Nanocrystals: A Contradiction to the Bulk Form; J. Mater. Chem. C  2021 9, 288-293. 

  8. C. Muthu, J. K. Pious, P. S. Seethal, N. Krishna, C. Vijayakumar*, Formamidinium Lead Iodide Perovskite Nanocrystal/Squaraine Dye Composite based Visibly Opaque and Near‐Infrared Transmitting Material; Adv. Optical Mater., 2020, 2001130-2001138. 

  9. J. K. Pious, C. Muthu, S. Dani, A. Saeki, C. Vijayakumar*, Bismuth-Based Zero-Dimensional Perovskite-like Materials: Effect of Benzylammonium on Dielectric Confinement and Photoconductivity; Chem. Mater. 2020, 32, 6, 2647–2652.

  10. J. K. Pious, M. G. Basavarajappa, C. Muthu, N. Krishna, R. Nishikubo, A. Saeki, S. Chakraborty*, C. Vijayakumar*; Anisotropic Photoconductivity and Long-Lived Charge Carriers in Bismuth-Based One-Dimensional Perovskite with Type-IIa Band AlignmentJ. Phys. Chem. Lett. 2020, 11, 16, 6757–6762.

  11. S. Thawarkar, P. Nagarjuna, A. Bagui, R. Narayan, J. S. Panicker, C. Vijayakumar, S. P. Singh; Trifluoromethyl‐Directed Supramolecular Self‐Assembly of Fullerenes: Synthesis, Characterization and Photovoltaic ApplicationsChem. Select  2020, 5, 1115 –1121.

  12. J. K. Pious, A. Katre, C. Muthu, S. Chakraborty, S. Krishna, C. Vijayakumar*; Zero- Dimensional Lead-Free Hybrid Perovskite-like Material with a Quantum-Well Structure; Chem. Mater., 2019, 31, 1941-1945.

  13. S. Ghimire, C. Vijayakumar*, C. Muthu, K.-i. Yuyama, M. Vacha, V. Biju*; Photoinduced photoluminescence enhancement in self-assembled clusters of formamidinium lead bromide perovskite nanocrystals; Nanoscale 2019, 11, 9335-9340.

  14. C. Vijayakumar*, K. K. Kartha, B. Balan, S. Poulose, M. Takeuchi*; Protein-assisted supramolecular control over fluorescence resonance energy transfer in aqueous medium; J. Phys. Chem. C  2019, 123, 13141-13146.

  15. T. Ghosh, S. Nagasawa, N. Raveendran, V. Darshan, A. Saeki, C. Vijayakumar*; Preferential face-on and edge-on orientation of thiophene oligomers by rational molecular design; Chem. Asian J. 2019, 14, 963-967.

  16. V. V. Malov, T. Ghosh, C. Vijayakumar, M. M. Maslov, K. P. Katin, K. N. N. Unni, A. R. Tameev*; Hole mobility in thieno[3,2-b]thiophene oligomers; Mendeleev Commun, 2019, 218-219.

  17. K. C. Naeem, C. Vijayakumar*; Reversible switching of solid-state luminescence by heat-induced interconversion of molecular packing; Mol. Syst. Des. Eng., 2018, 3, 142-149.

  18. J. K. Pious, M. L. Lekshmi, C. Muthu, R. B. Rakhi*, C. Vijayakumar*; Zero-Dimensional Methylammonium Bismuth Iodide-Based Lead Free Perovskite CapacitorACS Omega 2017, 2, 9, 5798–5802.

  19. K. C. Naeem, K. Neenu, C. Vijayakumar*; Effect of differential self-assembly on mechanochromic luminescence of fluorene-benzothiadiazole-based fluorophores; ACS Omega 2017, 2, 12, 9118–9126.

  20. C. Muthu, A. Vijayan, C. Vijayakumar*; CH3NH3PbBr3 Perovskite Nanocrystals as Efficient Light-Harvesting Antenna for Fluorescence Resonance Energy Transfer; Chem. Asian J. 2017, 12, 9, 988–995.

  21. T. Ghosh, J. S. Panicker, C. Vijayakumar*; Self-Assembled Organic Materials for Photovoltaic ApplicationPolymers 2017, 9, 3, 112.

  22. C. Vijayakumar*, C. Muthu, A. L. Rogach, R. Kohara, V. Biju*; Channeling Exciton Migration into Electron Transfer in Formamidinium Lead Bromide Perovskite Nanocrystal/Fullerene Composites; Angew. Chem. Int. Ed. 2017, 56, 1214–1218.

  23. J. S. Panicker, S. Nagasawa, A. Saeki*, C. Vijayakumar*; Synthesis and Optoelectronic Properties of Thiophene-Based Semiconducting Oligomers; Chem. Select 2016, 1, 6872–6879.

  24. J. S. Panicker, B. Balan*, S. Soman*, C. Vijayakumar; Understanding structure-property correlation of metal free organic dyes using interfacial electron transfer measurementsSolar Energy 2016, 139, 547–556.

  25. T. Ghosh, A. Gopal, S. Nagasawa, N. Mohan, A. Saeki*, C. Vijayakumar*; Following the TRMC trail: Optimization of photovoltaic efficiency and structure−property correlation of thiophene oligomersACS Appl. Mater. Interfaces 2016, 8, 25396−25404. 

  26. C. Muthu, S. Agarwal, A. Vijayan, P. Hazra, K. B. Jinesh*, C. Vijayakumar*; Hybrid perovskite nanoparticles for high-performance resistive random access memory devices: Control of operational parameters through chloride doping; Adv. Mater. Interfaces 2016, 3, 1600092.

  27. P. Kumar, C. Muthu, C. Vijayakumar, K. S. Narayan*; Quantum confinement effects in organic lead tribromide perovskite nanoparticles; J. Phys. Chem. C  2016, 120, 18333-18339.

  28. B. Vedhanarayanan, V. S. Nair, C. Vijayakumar, A. Ajayaghosh*; Formation of coaxial nanocables with amplified supramolecular Chirality through an interaction between carbon nanotubes and a chiral pi-gelator; Angew. Chem. Int. Ed. 2016, 55, 10345–10349.

  29. J. S. Panicker, B. Balan*, S. Soman*, T. Ghosh, C. Vijayakumar; Thiophene-bithiazole based metal-free dye as DSSC sensitizer: Effect of co-adsorbents on photovoltaic efficiency; J. Chem. Sci. 2016, 128, 101-110.

  30. K. C. Naeem, A. Subhakumari, S. Varughese, C. Vijayakumar*; Heteroatom induced contrasting effects on the stimuli responsive properties of anthracene based donor–pi–acceptor fluorophores; J. Mater. Chem. C 2015, 3, 10225-10231.

  31. T. Ghosh, A. Gopal, A. Saeki*, S. Seki, C. Vijayakumar*; p/n-Polarity of thiophene oligomers in photovoltaic cells: role of molecular vs. supramolecular propertiesPhys. Chem. Chem. Phys. 2015, 17, 10630-10639.

  32. S. Prasanthkumar, S. Ghosh, C. Vijayakumar, A. Saeki, S. Seki, A. Ajayaghosh*; Organic donor-acceptor assemblies form coaxial p–n heterojunctions with high photoconductivityAngew. Chem. Int. Ed. 2015, 54, 946–950.

  33. C. Muthu, S. R. Nagamma, C. Vijayakumar*; Luminescent hybrid perovskite nanoparticles as a new platform for selective detection of 2,4,6-trinitrophenol; RSC Adv. 2014, 4, 55908–55911.

  34. K. Kartha, A. Sandeep, C. Vijayakumar, M. Takeuchi*, A. Ajayaghosh*; A carbazole–fluorene molecular hybrid for quantitative detection of TNT using a combined fluorescence and quartz crystal microbalance methodPhys. Chem. Chem. Phys. 2014, 16, 18896–18901.

  35. M. Tsuji, A. Saeki*, Y. Koizumi, N. Matsuyama, C. Vijayakumar, S. Seki*; Benzobisthiazole as weak donor for improved photovoltaic performance: Microwave conductivity technique assisted molecular engineering; Adv. Funct. Mater. 2014, 24, 28–36.

  36. B. Balan, C. Vijayakumar, A. Saeki*, Y. Koizumi, M. Tsujia, S. Seki*; Optical and electrical properties of dithienothiophene based conjugated polymers: medium donor vs. weak, medium, and strong acceptors; Polym. Chem. 2013, 4, 2293–2303.

  37. Y. Koizumi*, M. Ide, A. Saeki, C. Vijayakumar, B. Balan, M. Kawamoto, S. Seki*; Thienoisoindigo-based low-band gap polymers for organic electronic devices; Polym. Chem. 2013, 4, 484–494.

  38. A. Saeki*, S. Yoshikawa, M. Tsuji, Y. Koizumi, M. Ide, C. Vijayakumar, S. Seki; A versatile approach to organic photovoltaics evaluation using white light pulse and microwave conductivity; J. Am. Chem. Soc. 2012, 134, 19035–19042. 

  39. C. Vijayakumar, B. Balan, A. Saeki*, T. Tsuda, S. Kuwabata, S. Seki*; Gold nanoparticle assisted self-assembly and enhancement of charge carrier mobilities of a conjugated polymer; J. Phys. Chem. C 2012, 116, 17343–17350.

  40. C. Vijayakumar, A. Saeki*, S. Seki*; Optoelectronic properties of dicyanofluorene based n-type polymers; Chem. Asian J. 2012, 7, 1845–1852.

  41. B. Balan, C. Vijayakumar, M. Tsuji, A. Saeki*, S. Seki*; Detection and distinction of DNT and TNT with a fluorescent conjugated polymer using microwave conductivity techniqueJ. Phys. Chem. B 2012, 116, 10371−10378.

  42. B. Balan, C. Vijayakumar, A. Saeki*, Y. Koizumi, S. Seki*; p/n Switching of ambipolar bithiazole-benzothiadiazole-based polymers in photovoltaic cells; Macromolecules 2012, 45, 2709–2719.

  43. S. Seki*, A. Saeki, W. Choi, Y. Maeyoshi, M. Omichi, A. Asano, K. Enomoto, C. Vijayakumar, M. Sugimoto, S. Tsukuda, S.-i. Tanaka; Semiconducting cross-linked polymer nanowires prepared by high- energy single-particle track reactionsJ. Phys. Chem. B 2012, 116, 12857−12863.

  44. B. Balan, C. Vijayakumar, S. Ogi, M. Takeuchi*; Oligofluorene-based nanoparticles in aqueous medium: Hydrogen bond assisted modulation of functional properties and color-tunable FRET emissionJ. Mater. Chem. 2012, 22, 11224–11234.

  45. C. Vijayakumar, B. Balan, M.-J. Kim, M. Takeuchi*; No-covalent functionalization of SWNTs with azobenzene-containing polymers: Solubility, stability, and enhancement of photoresponsive properties; J. Phys. Chem. C 2011, 115, 4533–4539.

  46. C. Vijayakumar, V. K. Praveen, K. K. Kartha, A. Ajayaghosh*; Excitation energy migration in oligo(p-phenylenevinylene) based organogels: structure-property relationship and FRET efficiency; Phys. Chem. Chem. Phys. 2011, 13, 4942–4949.

  47. C. Vijayakumar, K. Sugiyasu, M. Takeuchi*; Oligofluorene-based electrophoretic nanoparticles in aqueous medium as a donor scaffold for fluorescence resonance energy transfer and white light emission; Chem. Sci. 2011, 2, 291–294.

  48. C. Vijayakumar, G. Tobin, W. Schmitt, M.-J. Kim, M. Takeuchi*; Detection of explosive vapors with a charge transfer molecule: Self-assembly assisted morphology tuning and enhancement in sensing efficiency; Chem. Commun. 2010, 46, 874–876.

  49. C. Vijayakumar, V. K. Praveen, A. Ajayaghosh*; RGB emission through controlled donor self-assembly and modulation of excitation energy transfer: A novel approach to white light emitting organogels; Adv. Mater. 2009, 21, 2059–2063.

  50. V. K. Praveen, S. S. Babu, C. Vijayakumar, R. Varghese, A. Ajayaghosh*; Helical supramolecular architectures of self-assembled linear pi-systemsBull. Chem. Soc. Jpn. 2008, 81, 1196–1211.

  51. A. Ajayaghosh*, V. K. Praveen, C. Vijayakumar; Organogels as scaffolds for excitation energy transfer and light harvestingChem. Soc. Rev. 2008, 37, 109–122.

  52. A. Ajayaghosh*, V. K. Praveen, C. Vijayakumar, S. J. Goerge; Molecular wire encapsulated into pi-organogels: efficient supramolecular light harvesting antennae with color-tunable emissionAngew. Chem. Int. Ed. 2007, 46, 6260–6265.

  53. V. K. Praveen, S. J. George, R. Varghese, C. Vijayakumar, A. Ajayaghosh*; Self-assembled pi-nanotapes as donor scaffolds for selective and thermally gated fluorescence resonance energy transfer (FRET)J. Am. Chem. Soc. 2006, 128, 7542-7550.

  54. A. Ajayaghosh*, C. Vijayakumar, V. K. Praveen, S. S. Babu, R. Varghese; Self-location of acceptors as “isolated” or “stacked” energy traps in a supramolecular donor self-assembly: A strategy to wavelength tunable FRET emissionJ. Am. Chem. Soc. 2006, 128, 7174-7175.

  55. A. Ajayaghosh*, R. Varghese, S. J. George, C. Vijayakumar; Transcription and amplification of molecular chirality to oppositely biased supramolecular pi-helices; Angew. Chem. Int. Ed. 2006, 45, 1141-1144. (VIP article with front cover page)

  56. A. Ajayaghosh*, C. Vijayakumar, R. Varghese, S. J. George; Cholesterol-aided supramolecular control over chromophore packing: Twisted and coiled helices with distinct optical, chiroptical and morphological features; Angew. Chem. Int. Ed. 2006, 45, 456-460. (VIP article)


  1. A. Ajayaghosh, C. Sandeep, C. Vijayakumar; A thermoresponsive self-assembled organic material as photonic ink and a process of making thereof; Filed

  2. B. Deb, C. Vijayakumar, I. Vijitha, M. R. Meshram, J.Singh, T. P. Yuvaraj; Thermoelectric material and process for the preparation thereof; Filed (0068NF2018)

  3. A. Ajayaghosh, C. Vijayakumar, V. K. Praveen White light emitting organogel and process thereof IN200702749-I1; US2010283006-A1; WO2009084006-A1.