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21 Mar 2005

Volume 86, Issue 12, Articles (12xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 86, 123102 (2005); http://dx.doi.org/10.1063/1.1885187 (3 pages)

Jong H. Na, Robert A. Taylor, James H. Rice, James W. Robinson, Kwan H. Lee, Young S. Park, Chang M. Park, and Tae W. Kang
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Potential imaging of Si/HfO2/polycrystalline silicon gate stacks: Evidence for an oxide dipole

R. Ludeke, V. Narayanan, E. P. Gusev, E. Cartier, and S. J. Chey

Appl. Phys. Lett. 86, 122901 (2005); http://dx.doi.org/10.1063/1.1890483 (3 pages) | Cited 4 times

Online Publication Date: 17 March 2005

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Surface potential profiles of the junction area of a cleaved n-Si(100)/HfO2/p+-polycrystalline silicon (poly-Si) gate stack reveal a dipole potential in the oxide, hole trapping at the HfO2/poly-Si interface, with the Fermi level ∼ 0.4 eV below the Si conduction bandedge and enhanced and inhomogeneous hole depletion in the p+-poly-Si. The dipole accounts for band bending reduction in the n-Si and is consistent with flatband voltage shifts reported for similar gate stacks.
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73.40.Qv Metal-insulator-semiconductor structures (including semiconductor-to-insulator)
73.20.At Surface states, band structure, electron density of states
72.20.Jv Charge carriers: generation, recombination, lifetime, and trapping
85.30.Tv Field effect devices
68.35.B- Structure of clean surfaces (and surface reconstruction)

Improved microwave dielectric properties of (Mg1−(x+y)CaxLay)(Ti1−yAly)O3 ceramics

T. R. N. Kutty and S. Jayanthi

Appl. Phys. Lett. 86, 122902 (2005); http://dx.doi.org/10.1063/1.1883333 (3 pages) | Cited 3 times

Online Publication Date: 17 March 2005

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Phase-singular solids of the composition, (Mg1−(x+y) Cax Lay)(Ti1−yAly)O3 (x = 0 to 0.88; y = 0.05 to 0.35) having the cubic perovskite-type structure were prepared by the substitution of La3+ and Al3+ in equivalent quantities which brought about complete miscibility between MgTiO3 and CaTiO3. These ceramics showed relative permittivities of 16.5 to 50 (at 6 GHz) with increasing Ca content, high Q values of 10 000 to 30 000 and retained near-zero temperature coefficients in permittivity at optimum y values. Their dielectric characteristics are better accountable in terms of the positional disorder rather than the tolerance factor of perovskite structure.
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77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
77.22.Ch Permittivity (dielectric function)
64.75.-g Phase equilibria

Dielectric measurement of ferroelectric Sr0.61Ba0.39Nb2O6 single crystal fiber using cavity perturbation method

Chuanyong Huang, Amar S. Bhalla, M. T. Lanagan, L. Eric Cross, and Ruyan Guo

Appl. Phys. Lett. 86, 122903 (2005); http://dx.doi.org/10.1063/1.1891294 (3 pages) | Cited 4 times

Online Publication Date: 18 March 2005

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The nonlinear dielectric property of the ferroelectric Sr0.61Ba0.39Nb2O6 (SBN) crystal is essential to device application at various frequency ranges. The dielectric constant of the SBN single crystal fiber was investigated at x band microwave frequency using the resonant cavity perturbation method. It was found that compared with large and decreasing dielectric constant of SBN at low frequency, the dielectric property of the SBN crystal at x band frequency was smaller with similar value controlled by dipole orientation or atomic vibration.
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77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
77.22.Ch Permittivity (dielectric function)
77.22.Jp Dielectric breakdown and space-charge effects
77.22.Gm Dielectric loss and relaxation
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