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Differential Body-Factor Technique for Characterization of Interface Traps in MOSFETs

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9 Author(s)
Daeyoun Yun ; Sch. of Electr. Eng., Kookmin Univ., Seoul, South Korea ; Bae, Minkyung ; Jang, Jaeman ; Hagyoul Bae
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A differential body-factor technique (DBT) is proposed for characterization of interface traps in MOSFETs employing the differential body factor dm/dVGS instead of the subthreshold slope or the body factor itself. The DBT is independent of the threshold voltage variation and advantageous to apply to MOSFETs with strong nonlinearity in the subthreshold slope caused by a nonuniform distribution of traps over the band gap. We applied the DBT to n- and p-MOSFETs with W/L = 5/0.13, 5/0.18, and 2/0.13μm/μm on the same wafer and obtained identical results. Extracted interface trap density ranges Dit = 1010-1011 cm-2eV-1 with a U-shaped distribution over the band gap.

Published in:

Electron Device Letters, IEEE  (Volume:32 ,  Issue: 9 )

Date of Publication:

Sept. 2011

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