IEICE Electronics Express
Online ISSN : 1349-2543
LETTER
Effective mobility and interface-state density of La2O3 nMISFETs after post deposition annealing
Jin-Aun NgNobuyuki SugiiKuniyuki KakushimaParhat AhmetKazuo TsutsuiTakeo HattoriHiroshi Iwai
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2006 Volume 3 Issue 13 Pages 316-321

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Abstract

In this paper, we reported the effective mobility and the interface-state density of La2O3 nMISFETs fabricated under different post deposition annealing (PDA) conditions; annealing temperature (300°C - 600°C) and ambient (N2 or O2). High effective mobility of 312cm2/Vs and low interface-state density of 6 × 1010cm-2/eV were obtained from La2O3 nMISFET with equivalent oxide thickness (EOT) of 1.7nm after PDA at 300°C in N2 ambient for 10 minutes. Gate leakage current density was 6.8 × 10-6A/cm2. We found that peak effective mobility decreased with increasing anneal temperature, regardless of annealing ambient. We also observed a monotonous relationship between effective mobility and interface-state density. This behavior suggests that lowering the interface-state density is essential to obtain high mobility in the high-κ/Si structure.

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© 2006 by The Institute of Electronics, Information and Communication Engineers
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