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Arsenic-Segregated Rare-Earth Silicide Junctions: Reduction of Schottky Barrier and Integration in Metallic n-MOSFETs on SOI

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5 Author(s)
Larrieu, Guilhem ; Inst. d''Electron. et de Microelectron. et de Nanotechnol., Villeneuve-d''Ascq, France ; Yarekha, Dmitri A. ; Dubois, E. ; Breil, N.
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As an attempt to considerably reduce the equivalent contact resistivity of Schottky junctions, this letter studies the integration of rare-earth silicides, known to feature the lowest Schottky barriers (SBs) to electrons, coupled with a dopant segregation based on arsenic (As+) implantation. Both erbium (Er) and ytterbium (Yb) have been considered in the implant-before-silicide (IBS) and implant-to-silicide flavors. It is shown that the two schemes coupled with a limited thermal budget (500degC) produce an SB below the target of 0.1 eV. The implementation of IBS arsenic-segregated YbSi1.8 junctions in an n-type SB-MOSFET is demonstrated for the first time resulting in a current-drive improvement of more than one decade over the dopant-free counterpart.

Published in:

Electron Device Letters, IEEE  (Volume:30 ,  Issue: 12 )

Date of Publication:

Dec. 2009

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