I-V-T measurements on GaAs/AlGaAs heterojunctions interpreted on the basis of thermally assisted tunneling

A. Sellai, M. S. Raven, M. Henini

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

I-V-T data is routinely used to determine the conduction band discontinuity in heterojunction structures. In the present paper, capacitance-voltage and current-voltage-temperature measurements performed on AlGaAs/GaAs isotype heterojunctions are presented and analyzed over a wide temperature range (77 K-300 K). Considering thermionic emission alone when analyzing I-V-T data resulted in several problems. The Richardson plot [ln(J0/T2) vs. 1/T], in particular while suggesting that the thermally activated process is of importance in the overall conduction mechanism, shows two distinct linear regions of different slope over two temperature ranges. Also the derived activation energies and hence the band discontinuity from I-V-T data is very much lower than the value obtained from C-V profiling which is in very good agreement with values routinely published in literature. However, the results obtained from both I-V-T and C-V data are reconciled when considering a simple analytical expression for the current based on the assumption that thermally assisted tunneling is the dominant current generating mechanism over most of the temperature range.

Original languageEnglish
Pages (from-to)131-136
Number of pages6
JournalEPJ Applied Physics
Volume9
Issue number2
Publication statusPublished - Feb 2000

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aluminum gallium arsenides
Heterojunctions
heterojunctions
discontinuity
Thermionic emission
thermionic emission
Voltage measurement
electric potential
Conduction bands
Temperature measurement
Temperature
temperature
temperature measurement
conduction bands
Capacitance
Activation energy
plots
capacitance
slopes
activation energy

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

I-V-T measurements on GaAs/AlGaAs heterojunctions interpreted on the basis of thermally assisted tunneling. / Sellai, A.; Raven, M. S.; Henini, M.

In: EPJ Applied Physics, Vol. 9, No. 2, 02.2000, p. 131-136.

Research output: Contribution to journalArticle

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