The effect of as-implanted damage on the microstructure of threading dislocations in MeV implanted silicon

Document Type

Article

Publication Date

8-1-1999

Abstract

The dose dependence of as-implanted damage and the density of threading dislocations formed after MeV implants into Si is measured. The role of the damage and amorphization in the evolution of dislocation microstructure is assessed. As-implanted damage is analyzed by Rutherford backscattering spectroscopy and channeling. Defect etching is used to delineate threading dislocations in near-surface regions of annealed (900°C, 30 min) samples. For a variety of implants with 1.1 μm projected range (600 keV B, 1 MeV P, and 2 MeV As) we observe a sharp onset for formation of threading dislocations with a peak in dislocation density at a dose of about 1 × 1014 cm-2, this dose depends on the ion mass. With a further increase in dose, the dislocation density decreases. This decrease, however, is drastically different for the different ions: sharp (4-5 orders of magnitude) reduction for P and As implants and slow decline for B implant. The sharp decrease in the density of threading dislocations at higher doses is correlated with the onset of amorphization observed by channeling for P and As implants. Our data for low-temperature implants provide conclusive proof that a reduction in the dislocation density for P and As implants is a result of amorphization. © 1999 American Institute of Physics.

Identifier

0000618496 (Scopus)

Publication Title

Journal of Applied Physics

External Full Text Location

https://doi.org/10.1063/1.370874

ISSN

00218979

First Page

1221

Last Page

1225

Issue

3

Volume

86

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