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Publications

  1. Transmission electron microscopy studies on structure and defects in in crystalline yttria and lanthanum oxide thin films grown on single crystal sapphire by molecular beam synthesis, M. Tsuchiya, N. Bojarczuk, S. Guha and S. Ramanathan, Philosophical Magazine, in press, 2009

  2. Electrical triggering of the metal-insulator transition in nanoscale vanadium oxide junctions, D. Ruzmetov, G. Gopalakrishnan, J. Deng, V. Narayanamurti and S. Ramanathan, Journal of Applied Physics, 106, 083702 (2009)

  3. Fabrication and electrochemical performance of thin film solid oxide fuel cells with large area nanostructured membranes, A. C. Johnson, A. Baclig, D. Harburg, B.K. Lai and S. Ramanathan, Journal of Power Sources, 195, 1149 (2010)

  4. Photon-assisted synthesis of ultra-thin yttria-zoped zirconia membranes: Sturcture, variable temperature conductivity and micro-fuel cell devices, M. Tsuchiya, B.K. Lai, A.C.Johnson and S. Ramanathan, Journal of Power Sources, 195, 994 (2010)

  5. Electric field tuning of oxygen stoichiometry at oxide surfaces: molecular dynamics simulations studies on zirconia, S.K.R.S. Sankaranarayanan, E. Kaxiras and S. Ramanathan, Energy and Environmental Science, 2, 1196 (2009)

  6. Microstructural effects on electrical conductivity relaxation in nanoscale ceria thin films, M. Tsuchiya, N. Bojarczuk, S. Guha and S. Ramanathan, Journal of Chemical Physics, 130, 174711 (2009)

  7. Interface-mediated ultra-fast carrier conduction in oxide thin films and superlattices for energy, S. Ramanathan, Journal of Vacuum Science and Technology A, 27, 1126 (2009) (critical review) , also selected for publication in Virtual Journal of Ultrafast Science, August 2009 issue

  8. Low temperature electrochemical characterization of dense ultra-thin La0.6Sr0.4Co0.8Fe0.2O3 cathodes synthesized by RF-sputtering on nano-porous alumina supported yttria-doped zirconia membranes, H. Xiong, B. K. Lai, A.C. Johnson and S. Ramanathan, Journal of Power Sources, 193, 589, 2009

  9. Photon-assisted oxidation and oxide synthesis: A review, M. Tsuchiya, K.R.S.S. Sankaranarayanan and S. Ramanathan, Progress in Materials Science, 54, 981 (2009)

  10. Dispersive capacitance and conductance in thin film vanadium oxide devices, C. Ko and S. Ramanathan, Journal of Applied Physics, 106, 034101 (2009)

  11. Transference numbers for in-plane carrier conduction in thin film nanostructured gadolinia-doped ceria under varying oxygen partial pressures, A. Podpirka and S. Ramanathan, Journal of the American Ceramic Society, 92, 2400 (2009)

  12. Microstructure and microfabrication considerations for self-supported on-chip ultra-thin micro solid oxide fuel cell membranes, B. K. Lai, H. Xiong, A. C. Johnson, M. Tsuchiya and S. Ramanathan, Fuel Cells, 9, 699 (2009)

  13. On the relationship between non-stoichiometry and passivity breakdown in ultra-thin oxides: Combined depth-dependent spectroscopy, Mott-Schottky analysis and molecular dynamics simulations studies, C. L. Chang, K. R. S. S. Sankaranarayanan, M. Engelhard, V. Shutthanandan and S. Ramanathan, Journal of Physical Chemistry C, 119, 3502 (2009)

  14. Atomistic simulations of field enhanced oxidation of Al (100) beyond the Mott potential, S. K.R. S. Sankaranarayanan, E. Kaxiras and S. Ramanathan, Physical Review Letters, 102, 095504 (2009)

  15. Carrier density and magneto-resistance measurements on vanadium oxide thin films across the phase transition boundary, D. Ruzmetov, D. Heiman, B. Claflin, V. Narayanamurti and S. Ramanathan, Physical Review B, 75, 153107 (2009)

  16. Synthesis and variable temperature electrical conductivity studies highly ordered TiO2 nanotubes, R. Asmatulu, A. Karthiekyan, D. Bell, S. Ramanathan, M. J. Aziz, Journal of Materials Science, 44, 4613 (2009)

  17. On the triggering mechanism for the metal-insulator transition in thin film vanadium oxide devices: Electric field versus thermal effects, G. Gopalakrishnan, D. Ruzmetov and S. Ramanathan, Journal of Materials Science, 44, 5345 (2009) (special issue on oxides)

  18. A post-growth processing methodology to achieve barium strontium titanate thin films with low dielectric loss and high tunability for reconfigurable tunable devices, M. W. Cole, A. Podpirka and S. Ramanathan, Journal of Materials Science, 44, 5332 (2009) (special issue on oxides)

  19. Correlation between metal-insulator transition characteristics and electronic structure changes in vanadium oxide thin films, D. Ruzmetov, S. D. Senanayake, V. Narayanamurti and S. Ramanathan, Physical Review B, 77, 195442 (2008)

  20. Direct measurement of oxygen incorporation into thin film oxides at room temperature under photon irradiation, M. Tsuchiya, V. Shutthandan, M. Engelhard and S. Ramanathan, Applied Physics Letters, 93, 263109 (2008)

  21. Observation of electric field-assisted phase transition in vanadium oxide thin films in a metal-oxide-semiconductor device geometry, C. Ko and S. Ramanathan, Applied Physics Letters, 93, 252101 (2008)

  22. An experimental investigation into micro-fabricated fuel cells utilizing ultra-thin LaSrCoFeO3 cathodes and yttria-doped zirconia electrolyte films, A.C. Johnson, B.K. Lai, H. Xiong and S. Ramanathan, Journal of Power Sources, 186, 252 (2009)

  23. Ultra-thin nanocrystalline Lanthanum Strontium Cobalt Ferrite thin films synthesis by RF-sputtering and temperature-dependent conductivity studies, B. Lai, A. C. Johnson, H. Xiong and S. Ramanathan, Journal of Power Sources, 186, 115 (2009)

  24. Infra-red reflectance and photoemission spectroscopy studies across the phase transition boundary in thin film vanadium oxide, D. Ruzmetov, K. Zawilski, S.D. Senanayake, V. Narayanamurti and S. Ramanathan, Journal of Physics: Condensed Matter, 20, 465204 (2008)

  25. Temperature-dependent interfacial carrier transport in low-dimensional oxides using ionic conductor-insulator (YSZ-SiO2) superlattices, A. Karthikeyan and S. Ramanathan, Journal of Applied Physics, 104, 124314 (2008)

  26. On the low temperature oxidation and ultra-thin oxide growth on Zr in the presence of atomic oxygen: A modeling study, S. K.R. S. Sankaranarayan and S. Ramanathan, Journal of Physical Chemistry C , 112, 17877 (2008)

  27. Photon effects in ultra-thin oxide films: Synthesis and Functional Properties, S. Ramanathan, M. Tscuhiya, C. Ko and C.L. Chang, Ceramic Transactions, 203, 143 (2009)

  28. Apatite-phase synthesis from interdiffusion in doped CeO2-SiO2 thin film superlattices and in-situ conductivity studies, A. Karthikeyan, M. Tsuchiya and S. Ramanathan, Electrochemical and Solid State Letters, 11, K101 (2008)

  29. Stability of electrical switching in thin film vanadium oxide upon multiple thermal cycling across the phase transition boundary, C. Ko and S. Ramanathan, Journal of Applied Physics, 104, 086105 (2008)

  30. Superior nanoscale passive oxide layers synthesized under photon irradiation for environmental protection, C. L. Chang, M. Engelhard and S. Ramanathan, Applied Physics Letters, 92, 263103 (2008)

  31. Enhanced grain growth under photon irradiation in yttria-doped zirconia thin film structures, M. Tsuchiya and S. Ramanathan, Philosophical Magazine Letters, 88, 583 (2008)

  32. Molecular dynamics simulations study on nanoscale passive oxide growth on Ni-Al alloy surfaces at low temperatures, S. K. R. S. Sankaranarayan and S. Ramanathan, Physical Review B, 78, 085420 (2008)

  33. Ultra-thin Y-doped zirconia membranes synthesized under photon irradiation: Structure evolution and high temperature electrochemical transport studies, M. Tsuchiya and S. Ramanathan, Electrochemical Society Transactions, 11, 9 (2008)

  34. Synthesis of nitrogen passivated rare-earth doped hafnia thin films and high temperature electrochemical conductivtiy studies, S. Ramanathan, A. Karthikeyan, S. A. Govindarajan and P. Kirsch, Journal of Vacuum Science and Technology B, 26, L33 (2008)

  35. An investigation into photon irradiation induced structural and interfacial phenomena in pure and alio-valently doped zirconia thin films, M. Tsuchiya and S. Ramanathan, Philosophical Magazine, 88, 2519 (2008)

  36. Effect of photon irradiation on the structural, insulating and dielectric properties of (Ba,Sr)TiO3 films, A. Podpirka, M. W. Cole and S. Ramanathan, Applied Physics Letters, 92, 212906 (2008)

  37. Oxygen surface exchange studies in Gd-doped ceria thin films, A. Karthikeyan and S. Ramanathan, Applied Physics Letters, 92, 243109 (2008)

  38. Effect of ultra-violet irradiation on the electrical resistance and phase transition characteristics of thin film vanadium oxide, C. Ko and S. Ramanathan, Journal of Applied Physics, 103, 106104 (2008)

  39. Effect of rare-earth doping and nitrogen passivation treatments on properties of ultra-thin hafnia films, S. Ramanathan, A. Karthikeyan, S. A. Govindarajan and P. Kirsch, Electrochemical Society Transactions, 16, 497 (2008)

  40. Synthesis and interfacial phenomena in ultra-thin ytrria-doped zirconia films grown by alloy oxidation under photon irradiation, M. Tsuchiya and S. Ramanathan, Applied Physics Letters, 92, 033107 (2008)

  41. Synthesis and phase stability in ultra-thin solid electrolytes: The case of zirconia thin films, M. Tsuchiya, A. M. Minor and S. Ramanathan, Electrochemical Society Transactions, in press (2008)

  42. X-ray absorption spectroscopy studies of vanadium oxide thin films across the phase transition boundary, D. Ruzmetov, S. Senanayake and S. Ramanathan, Physical Review B, 75, 195102 (2007)

  43. Effect of photon irradiation on structure of yttria-doped zirconia thin films grown on semiconductor substrates, M. Tsuchiya and S. Ramanathan, Applied Physics Letters, 91, 253104 (2007)

  44. Higher permittivity rare-earth doped HfO2 and ZrO2 for logic and memory applications, S. Govindarajan, T. S. Boscke, P. Kirsch, M. A. Quevedo-Lopez, P. Sivasubramani, S. C. Song, R.M. Wallace, B. Gnade, P. Y. Hung, J. Price, U. Schroder, S. Ramanathan, B. H. Lee, R. Jammy, Proceedings of Technical Papers, International Symposium on VLSI Technology, Systems and Applications, 44-45 (2007)

  45. Molecular beam synthesis and high temperature electrical characterization of crystalline ceria thin films, M. Tsuchiya, N. Bojarczuk and S. Ramanathan, Applied Physics Letters, 91, 223101 (2007)

  46. Structure-functional property relationships in RF-sputtered vanadium oxide thin films, D. Ruzmetov, K. Zawilski, V. Narayanamurti and S. Ramanathan, Journal of Applied Physics, 102, 113715 (2007)

  47. Effect of intrinsic stress from a nanoscale high-dielectric constant gate oxide on carrier transport in a semiconductor channel, H.T. Wang and S. Ramanathan, Applied Physics Letters, 91, 012106 (2007); also selected for publication in Virtual Journal of Nanoscale Science and Technology, July 16, 2007 issue

  48. Observation of uniform temperature dependence in the electrical resistance across the structural phase transition in thin film vanadium oxide, R. Mani and S. Ramanathan, Applied Physics Letters, 91, 062104 (2007)

  49. Atomic layer deposition of Y2O3/ZrO2 nanolaminates: a route to ultra-thin solid-state electrolyte membranes, C.N. Ginestra, R. Sreenivasan, A. Karthikeyan, S. Ramanathan and P.C. McIntyre, Electrochemical and Solid State Letters, 10, B161 (2007), also selected for publication in Virtual Journal of Nanoscale Science and Technology, August 6, 2007 issue

  50. Size-dependent phase transformations in nanoscale pure and Y-doped zirconia thin films, M. Tsuchiya, A. M. Minor and S. Ramanathan, Philosophical Magazine, 87, 5673 (2007)

  51. On the stability and oxidation of single crystal (100) InAs Surfaces, C.L. Chang, V. Shutthandan, S.C. Singhal and S. Ramanathan, Electrochemical Society Transactions, Physics and Technology of High-k Gate Dielectrics V, 11 (4), 409 (2007)

  52. Studies on structure-electrochemical conduction relationships in doped-zirconia thin films, A. Karthikeyan, M. Tsuchiya and S. Ramanathan, Solid State Ionics, 179, 1234 (2008) (SSI-16 special issue)

  53. In-situ studies on stoichiometry and structure of thin film yttria-stabilized zirconia under thermal processing, C.L. Chang, V. Shutthanandan, S.C. Singhal and S. Ramanathan, Mater. Res. Soc. Symp. Proc. 1023-JJ01-07(2007)

  54. A theoretical approach to investigate nanoscale oxidation of metal surfaces under ultra-violet irradiation , C.L. Chang and S. Ramanathan, Journal of the Electrochemical Society, 154, G160 (2007)

  55. Tunable conductivity in nanoscale Gd-doped ceria thin films, A. Karthikeyan, M. Tsuchiya, C.L. Chang and S. Ramanathan, Applied Physics Letters, 90, 263108 (2007)

  56. Higher permittivity rare earth doped hafnium oxide for sub-45nm Metal-Insulator-Semiconductor devices, S. Govindarajan, T. S. Böscke, P. Sivasubramani, U. Schröder, S. Ramanathan, P.D. Kirsch, B. E. Gnade, B.H. Lee, H.-H. Tseng, R. Jammy, Applied Physics Letters, 91, 062906 ( 2007)

  57. Non-invasive high-resolution acoustic microscopy technique using embedded nanostructures, D. Wulin and S. Ramanathan, Mater. Res. Soc. Symp. Proc.1019-FF06-02 (2007)

  58. In-situ ion scattering and X-ray photoelectron spectroscopy studies of stability and nanoscale oxidation of single crystal (100) InAs, C.L. Chang, V. Shutthanandan, S.C. Singhal and S. Ramanathan, Applied Physics Letters, 90, 203109 (2007)

  59. Effect of photon irradiation on conductivity of nanoscale yttria-doped zirconia thin films, A. Karthikeyan and S. Ramanathan, Applied Physics Letters, 90, 093107 (2007)

  60. High temperature conductivity studies of nanoscale yttria-doped zirconia films and size effects, A. Karthikeyan, C.L. Chang and S. Ramanathan, Applied Physics Letters, 89, 183116 (2006)

  61. Theoretical investigation of on-chip sub-ambient microprocessor cooling, A. Jain and S. Ramanathan, Proceedings of ITHERM, 765-770 (2006)

  62. High-frequency acoustic microscopy studies on buried interfaces in silicon, S. Ramanathan, J. E. Semmens and L. W. Kessler, Proceedings of ECTC, 1865-1868 (2006)

  63. Theoretical analysis of thermal conductivitiy in amorphous inter-layer dielectrics, M. Samsa, P. Morrow and S. Ramanathan, Mater. Res. Soc. Symp. Proc., 914, F03-01 (2006)

  64. High-resolution non-invasive picosecond ultrasonic microscopy of buried interfaces, S. Ramanathan and D. G. Cahill, Journal of Materials Research: Rapid Communications, 21, 1204 (2006)

  65. Three-dimensional wafer stacking via Cu-Cu bonding integrated with 65 nm strained Si/low-k CMOS tchnology, P. Morrow, C. M. Park, S. Ramanathan, M. Kobrinsky and M. Harmes, IEEE Electron Device Letters, 27, 335 (2006)

  66. Non-destructive high-resolution characterization of buried interfaces for advanced interconnect and packaging architectures: experiments and modeling; S. Ramanathan, C. Hu, E. Pickett, P. Morrow, Y. Liu and R. Dias, Microelectronic Engineering, 82, 84 (2005)

  67. Advanced fault isolation and failure analysis techniques for future package technologies, M. Pacheco, Z. Wang, L. Skoglund, Y. Liu, A. Medina, A. Raman, R. Dias, D. Goyal and S. Ramanathan, Intel Technology Journal, 9, 337 (2005)

  68. Solid-state refrigeration for cooling microprocessors, S. Ramanathan and G. Chrysler, IEEE Transactions on Components, Packaging and Manufacturing Technologies, 29, 179 (2006)

  69. Wafer-level three-dimensional (3-D) interconnects via copper bonding, P. Morrow, M. Kobrinsky, S. Ramanathan, C. M. Park, M. Harmes, V. Ramachandrarao, S. Kim and S. List, Proc. Advanced Metallization Conference, 2005

  70. Charge-trapping studies in ZrO2 and HfO2 gate dielectrics grown by ultra-violet ozone oxidation, S. Ramanathan, P.C. McIntyre, S. Guha and E.P. Gusev, Applied Physics Letters, 84, 389 (2004)

  71. Ultra-violet ozone oxidation of metal films, S. Ramanathan, D. Chi, P.C. McIntyre, C.J. Wetteland and J.R. Tesmer, Journal of Electrochemical Society, 150, F110 (2003).

  72. Phase separation in hafnium silicates for alternative gate dielectrics, S. Ramanathan, P. C. McIntyre, J. Luning, P.S. Lysaght, Y. Yang, Z. Chen and S. Stemmer, Journal of Electrochemical Society, 150, F173 (2003)

  73. Germanium MOS capacitors incorporating ultra-thin high-k dielectric, C.O. Chui, S. Ramanathan, B. Triplett, P.C. McIntyre and K.C. Saraswat, IEEE Electron Device Letters, 23, 473 (2002).

  74. Structural studies on zirconia dielectrics, S. Ramanathan, P.C. McIntyre, J. Luning, P. Pianetta and D.A. Muller, Philosophical Magazine Letters, 82, 519 (2002).

  75. Ultra-thin zirconia / SiO2 dielectric stacks grown by ultra-violet ozone oxidation, S. Ramanathan and P.C. McIntyre, Applied Physics Letters, 80, 3793 (2002).

  76. Electrical properties of ultrathin zirconia films grown by UV ozone oxidation, S. Ramanathan, C.M. Park and P.C. McIntyre, Journal of Applied Physics, 91, 4521-4527 (2002).

  77. Room temperature grown ultra-thin zirconia / SiO2 stacks with 1 nm EOT, S. Ramanathan, P.C. McIntyre, S. Guha and E.P. Gusev, IEEE Device Research Conference Digest, p.101 (2002).

  78. Ultra-thin high-k gate dielectric technology for Germanium MOS applications, C. O. Chui, S. Ramanathan, B. B. Triplett, P. C. McIntyre, and K. C. Saraswat, IEEE Device Research Conference Digest, p. 191-192 (2002)

  79. Growth and characterization of ultra-thin zirconia dielectrics grown by UV-ozone oxidation, S. Ramanathan, G.D. Wilk, D.A. Muller, C.M. Park and P.C. McIntyre, Applied Physics Letters, 79, 2621-2623 (2001).

  80. Effect of oxygen stoichiometry on electrical properties of zirconia dielectrics, S. Ramanathan, D.A. Muller, G. Wilk, C.M. Park and P.C. McIntyre, Applied Physics Letters, 79, 3311-3313 (2001).

  81. Microstructural study of epitaxial Pt films and permalloy / Pt films on (0001) Sapphire, S. Ramanathan, B.M. Clemens, P.C. McIntyre and U. Dahmen, Philosophical Magazine A, 81, 2073-2094 (2001).

  82. Effects of deposition and annealing conditions on the structure and electrical properties of LPCVD silicon thin films, S. Das, S. Ramanathan, P.R.S. Rao and K.N. Bhat, Journal of Materials Science, 35, 4743-4746 (2000).

  83. Epitaxial Pt on (0001) sapphire A microstructural study, S. Ramanathan, P.C. McIntyre and U. Dahmen, Proceedings of Electron Microscopy Society of America, 6, p. 437 (2000).

  84. On the growth of BSCCO whiskers, S. Ramanathan, Z. Li and K. Ravichandar, Physica C, 289, 192 (1997)

Book Chapters

  • Exploratory studies on silicon-based oxide fuel cell power sources incorporating ultra-thin nanostructured platinum and cerium oxide films as anode components, B.K. Lai, A.C. Johnson, H. Xiong, C. Ko and S. Ramanathan, Future Trends in Microelectronics: Unmapped Roads, Wiley-IEEE Press, submitted, (Ed. A Zaslavsky, J. Xu and S. Luryi) 2009

Other Publications

  1. Materials and Devices for Beyond CMOS Scaling, edited by S. Ramanathan, Mater. Res. Soc. Symp. Proc. Volume 1067E, Warrendale, PA, 2008

  2. Towards low temperature solid oxide fuel cells, A.C. Johnson and S. Ramanathan, World Ecology Report, XIX, 2 (2007)

Ph.D. Dissertation

  • Studies on sub-100nm Fluorite-Derivative Oxide Films: Structural Evolution, Electrical Properties and Photon Effects, Masaru Tsuchiya, Harvard University, 2009

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