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Title: Suppression of oxidation enhanced boron diffusion in silicon by carbon implantation and characterization of MOSFETs with carbon implanted channels

Abstract

Scaling of MOSFETs into the deep submicron regime requires shallow doping profiles with abrupt doping transitions in the MOSFET active region. In NMOS transistors with boron doped channels, oxidation enhanced diffusion is a key contributor to boron profile broadening. Starting from the arguments presented in several recent reports on the role of carbon in silicon as a sink for self-interstitials, we have explored the feasibility of using carbon in the MOSFET in the active region to retard boron diffusion during gate oxidation. MOSFETs with carbon and boron implanted channels have been fabricated. Boron diffusion, activation, and critical electrical parameters such as subthreshold swing, threshold voltage, and off-state leakage current have been evaluated as a function of the carbon dose. We have shown that carbon can effectively suppress boron diffusion during gate oxidation. However, at dose levels around 10{sup 14}cm{sup -2} carbon results in poor boron activation and degradation in MOSFET performance.

Authors:
;  [1];  [2]
  1. North Carolina State Univ., Raleigh, NC (United States)
  2. National Semiconductor Corporation, Santa Clara, CA (United States)
Publication Date:
OSTI Identifier:
621324
Report Number(s):
CONF-9606110-
CNN: Grant 8721545;Grant 95-SJ-081; TRN: 98:002114-0067
Resource Type:
Conference
Resource Relation:
Conference: 11. international conference on ion implantation technology, Austin, TX (United States), 17-21 Jun 1996; Other Information: PBD: 1996; Related Information: Is Part Of Ion implantation technology - 96; Ishida, E.; Banerjee, S.; Mehta, S. [eds.] [and others]; PB: 859 p.
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BORON IONS; CARBON IONS; DIFFUSION; INTERSTITIALS; ION IMPLANTATION; LEAKAGE CURRENT; MOSFET; OXIDATION; SILICON

Citation Formats

Ban, I, Oeztuerk, M C, and Demirlioglu, E. Suppression of oxidation enhanced boron diffusion in silicon by carbon implantation and characterization of MOSFETs with carbon implanted channels. United States: N. p., 1996. Web.
Ban, I, Oeztuerk, M C, & Demirlioglu, E. Suppression of oxidation enhanced boron diffusion in silicon by carbon implantation and characterization of MOSFETs with carbon implanted channels. United States.
Ban, I, Oeztuerk, M C, and Demirlioglu, E. Tue . "Suppression of oxidation enhanced boron diffusion in silicon by carbon implantation and characterization of MOSFETs with carbon implanted channels". United States.
@article{osti_621324,
title = {Suppression of oxidation enhanced boron diffusion in silicon by carbon implantation and characterization of MOSFETs with carbon implanted channels},
author = {Ban, I and Oeztuerk, M C and Demirlioglu, E},
abstractNote = {Scaling of MOSFETs into the deep submicron regime requires shallow doping profiles with abrupt doping transitions in the MOSFET active region. In NMOS transistors with boron doped channels, oxidation enhanced diffusion is a key contributor to boron profile broadening. Starting from the arguments presented in several recent reports on the role of carbon in silicon as a sink for self-interstitials, we have explored the feasibility of using carbon in the MOSFET in the active region to retard boron diffusion during gate oxidation. MOSFETs with carbon and boron implanted channels have been fabricated. Boron diffusion, activation, and critical electrical parameters such as subthreshold swing, threshold voltage, and off-state leakage current have been evaluated as a function of the carbon dose. We have shown that carbon can effectively suppress boron diffusion during gate oxidation. However, at dose levels around 10{sup 14}cm{sup -2} carbon results in poor boron activation and degradation in MOSFET performance.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1996},
month = {12}
}

Conference:
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