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The effect of the planar doping on the electrical transport properties at the Al:n-GaAs(100) interface: Ultrahigh effective doping (1993)

Geraldo, J. M. ; Rodrigues, W. N. ; Medeiros-Ribeiro, G. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 73 (1993), S. 820-823

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: Measurements of the current density as a function of the applied bias have been performed to study the electronic properties of the Al:n-GaAs(100) interface. The samples were grown by molecular beam epitaxy. A Si planar doping was placed in GaAs(100) at different depths underneath the metal-semiconductor interface and the charge transport across this interface has been investigated. An increasing tunneling contribution to the net current through the Schottky barrier has been observed by decreasing the planar doping depth. For sufficiently small depths, the tunneling current dominated. Planar doping near the metal-semiconductor interface was found to be equivalent, concerning charge transport properties, to a bulk semiconductor doped well beyond the currently achievable limit.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.353343

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The diffuse behavior of the ferroelectric transition in poly(vinylidene fluoride-trifluoroethylene) copolymers (1994)

Moreira, R. L. ; Lobo, R. P. S. M. ; Medeiros-Ribeiro, G. ; [et al.]

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part B: Polymer Physics 32 (1994), S. 953-959

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ISSN: 0887-6266

Keywords: vinylidene fluoride ; trifluoroethylene copolymers ; ferroelectrics ; phase transitions ; Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Physics

Notes: The ferroelectric-to-paraelectric phase transition in poly(vinylidene fluoride-trifluoroethylene) copolymers has been investigated using calorimetric and dielectric technics. In these materials, as it is well known, the ferro- and paraelectric phases coexist at large temperature intervals, which produces a smearing of the physical anomalies within the transition region. Thus, in order to treat our data, we have used an extended Landau-Devonshire treatment, which has provided a quantitative analysis of the macroscopic behavior of the systems. In particular, the Landau expansion parameters, the sample crystallinities, the spontaneous polarizations, and the coercive electric fields have been estimated for the copolymers with 25, 30, and 40 mol% of trifluoroethylene. © 1994 John Wiley & Sons, Inc.

Additional Material: 4 Ill.