Role of 0.66 eV dominant trap in annealed low-temperature grown molecular beam epitaxial GaAs

N. C. Chen*, P. Y. Wang, Jenn-Fang Chen

*Corresponding author for this work

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

The sample considered herein is an annealed low-temperature (LT) molecular beam epitaxially grown GaAs of n-LT-i-p structure with the LT layer grown at 300°C. Characteristics involving the dominant trap level located at about 0.66 eV below the conduction band are obtained by analyzing the data of the admittance spectroscopy, capacitance-voltage, current-voltage, and frequency-dependent conductance experiments. This trap pins the fermi level of the LT layer and makes the LT layer semi-insulating. In this structure, the level interacts with both the conduction band and the valence band with a hole emission time constant characterized by an activation energy of 0.77 eV and a cross section of 1.1×10-13 cm2. This level is also an effective generation-recombination center when the temperature exceeds 300 K.

Original languageEnglish
Pages (from-to)1403-1409
Number of pages7
JournalJournal of Applied Physics
Volume83
Issue number3
DOIs
StatePublished - 1 Feb 1998

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