Current Crowding Phenomenon
In JBS Structures
Author(s)
T. Rang, R. Kurel, G. Higelin & L. Poirier
Abstract
In this paper the current crowding phenomenon in complementary 6H-SiC JBS
structures using numerical simulation tools MEDICI and DYNAMIT-2D is
investigated. The influence of ambient temperatures, barrier height (work
function) and epilayer concentration on behaviour of current flow is treated.
Three different types of current crowding mechanisms could be observed in JBS
devices. Two of them take place under forward bias conditions (caused by the
inhomogeneities at the SiC metal interface or introducing the comparable lateral
current component through the arbitrary pn-junction). When the change of the
barrier height has a very strong influence on current flow distribution, then in
other situations a clear current crowding effect can be seen only in some special
combinations of influencing parameters and especially around the areas where
the arbitrary pn-junction reaches the upper contact of the structures near the edge
of the Schottky interface. Under reverse bias, when the current flows away from
region under the arbitrary pn-junction of the JBS device and concentrates into
the section under the Schottky contact due to the built-in electrical field inside
the JBS device, which deforms the Schottky barrier height and width as well, a
clear current crowding situation is followed. In this paper both of the last two
mechanisms are discussed.
Keywords: SiC, pn-junction, Schottky junction, current crowding, numerical
modelling.
1 Introduction
Silicon Carbide (SiC) is considered to be a very promising material for high
temperature and high power applications due to its high breakdown field and
Keywords
SiC, pn-junction, Schottky junction, current crowding, numerical
modelling.
Related Book
Other papers in this volume
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