Space-charge-limited current theory for a spatially non-uniform trap distribution

Bonham J.S. (1978) Space-charge-limited current theory for a spatially non-uniform trap distribution. Australian Journal of Chemistry, 31 10: 2117-2130. doi:10.1071/CH9782117


Author Bonham J.S.
Title Space-charge-limited current theory for a spatially non-uniform trap distribution
Journal name Australian Journal of Chemistry   Check publisher's open access policy
ISSN 1445-0038
Publication date 1978
Sub-type Article (original research)
DOI 10.1071/CH9782117
Volume 31
Issue 10
Start page 2117
End page 2130
Total pages 14
Subject 1600 Chemistry
Abstract The theory of space-charge-limited current, including diffusion, is discussed for an insulator containing a shallow or exponential distribution of traps whose concentration varies with position, being higher near the insulator surface than in the bulk. Two simple step-function spatial distributions are considered-one symmetric and one asymmetric. Analytic treatments are given for the open-circuit situation in both cases. For the symmetric case simple formulae are derived for the current-voltage relation. The current may be bulk- or surface-limited or there may be a transition from the former to the latter as the voltage is raised, giving rise to considerable structure in the current-voltage curves not predicted by theory which neglects diffusion. An asymmetric distribution may give rise to rectification at low voltages. This can be treated by considering the region of high trap density near one electrode to make an effectively blocking contact to the bulk of the insulator. Comparison of open-circuit potential profiles for the step-function and exponential spatial trap distributions suggests that the system is insensitive at low voltage to the nature of the spatial distribution; only the trap density in the vicinity of the surfaces is important.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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Created: Tue, 09 Aug 2016, 02:29:57 EST by System User