Numerical investigation of the effects of graded layer on the performance of AlGaAs/GaAs heterojunction bipolar transistors

Debbar, Nacer; Alhokail, H.

doi:10.1080/002072100415594

Cited by 1 publication

(2 citation statements)

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“…4 In AlGaAs-GaAs HBTs, increase recombination in graded emitters decreases the offset voltage and the current gain, and increases the current driving capability, charging time, and emitter-base capacitance. 6 In addition, numerical simulations predict an enhancement of the off current and the on/off current ratio in a laterally graded junctionless transistor with a minimum doping concentration at the center of the channel. 7 Intentional or unintentional inhomogeneous doping profiles in nanostructures can be introduced by the vacuum spray method, 2 high pressure pulsed laser deposition, 8 or by the vapor-liquid-solid method.…”

Section: Introductionmentioning

confidence: 99%

“…[3][4][5][6][7]12 Quantum effects in such structures have been investigated primarily in systems that are inhomogeneous in spatial dimensions. 13,14 In this paper, we study the transport properties, in particular, the transmission, through nanoscale two dimensional (2D) conductors, known as nanoribbons, in which the spatial distribution of scattering centers is inhomogeneous.…”

Section: Introductionmentioning

confidence: 99%

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Effects of graded distribution of scattering centers on ballistic transport

Mitran

Nemneş

Ion

et al. 2014

Journal of Applied Physics

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Ballistic quantum transport in a nanoscale metal-oxide-semiconductor field effect transistorThe transmission coefficient of a two dimensional scattering region connected to ideal leads was calculated for the case of electrons interacting with an inhomogeneous distribution of repulsive or attractive scattering centers. The scattering centers with Gaussian profiles were positioned at regular intervals perpendicular to the transport direction, but were spaced according to a power law along this direction. The transmission function was obtained using a scattering formalism based on the R-matrix method. The simulations revealed that although, overall, the transmission coefficient decreases and becomes almost monotonously dependent on energy as the inhomogeneity of both attractive and repulsive scattering centers increases, the redistribution of transmission between open channels depends on the type of scattering centers. V C 2014 AIP Publishing LLC.

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Section: Introductionmentioning

confidence: 99%