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Mechanism of Dopant Activation Enhancement in Shallow Junctions by Hydrogen

Published online by Cambridge University Press:  01 February 2011

A. Vengurlekar ,
S. Ashok ,
Christine. E. Kalnas  and
H. Win Ye
A. Vengurlekar
Affiliation:
Department of Engineering Science, Pennsylvania State University, University Park, PA 16802
S. Ashok
Affiliation:
Department of Engineering Science, Pennsylvania State University, University Park, PA 16802
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Abstract

The ability to activate greater amounts of dopants is a significant challenge for the realization of shallow junctions in device scaling for Si CMOS technology. Dopant activation is difficult to achieve in shallow junctions due to higher concentrations of dopants and possible formation of dopant clusters. The high temperatures currently used to activate dopants result in increased junction depth and process integration issues with high-k dielectrics. However, lowering the annealing temperature results in lesser dopant activation and problems with transient enhanced diffusion. Our previous work reported on the enhancement of activation in boron implanted at a dose of 5E14/cm2 and annealed at temperatures of 450 °C and below, by the incorporation of atomic hydrogen introduced by exposing the substrate to a hydrogen plasma at 250 °C. In this work, further experiments have been carried out to get a better understanding of the mechanisms responsible for boron activation enhancement. Hydrogen-related activation was studied in boron, phosphorus and antimony implanted samples. The experimental results shed new light on the interactions among atomic hydrogen, point defects and dopants.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 864: Symposium E – Semiconductor Defect Engineering-Materials, Synthesis Structures and Devices , 2005 , E9.28
Copyright
Copyright © Materials Research Society 2005

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