Ho-Kei Chan, Yan Zhou, Chi-Hang Lam & Franklin G. Shin, Theory of Time-dependent Space-charge-limited Conduction, Proceedings of the 9th IEEE International Conference on Solid Dielectrics, 9th IEEE International Conference on Solid Dielectrics, Winchester, U. K., 8-13 July 2007, IEEE, 2007, 35 - 38
We have developed a theory of timedependent
space-charge-limited conduction in recent
years to understand a hysteresis-shift phenomenon of
graded ferroelectric films. The theory is a generalization
of the conventional steady-state space-charge-limited
conduction model to include (i) two carrier types (ptype
and n-type), (ii) intrinsic conductivity and (iii) time
dependence. Later, the theory was also applied to
understand the hysteresis behaviour of homogeneous
ferroelectric films. In this paper, a full and updated
version of the theory is presented. At the limit of zero
intrinsic conductivity, the theory implies the dominance
of either carrier type. Accordingly, the independent
assumptions of (i) a single carrier type and (ii) a
negligible intrinsic conductivity in the conventional
steady-state conduction model are interrelated.
PUBLISHED Winchester, U. K. This paper presents an updated version of the time-dependent space-charge-limited conduction model that was originally developed for the study of polarization offsets in compositionally graded ferroelectric films. It provides a more comprehensive justification of the mass-action approximation which is the cornerstone of the model.
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