UNSPECIFIED (1997) Structural and electrical properties of p(+)n junctions in Si by low energy Ga+ implantation. JOURNAL OF APPLIED PHYSICS, 82 (10). pp. 4990-4993. ISSN 0021-8979

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Abstract

Ultrashallow p(+)n junctions have been formed in silicon by low energy (5.5 keV) Ga+ implantation into n-type substrates. This avoids the use implantation of molecular species such as BF2+ or preamorphization with Ge+ or Si+, which degrade the integrity of p(+)n junctions in metastably strained SixGe1-x layers. High resolution secondary ion mass spectroscopy measurements indicate an implant peak at less than 10 nm, except for postanneal temperatures above 800 degrees C, for which severe loss of profile control was observed. Electrical characteristics of the implanted junctions were determined from diode current-voltage measurements and Hall data. At low anneal temperatures, these showed good rectification behavior, with an ideality factor of 1.1+/-0.1 and a reverse bias leakage of approximate to 3 mu A cm(-2) in a relatively large junction area of 5 x 10(-2) cm(2). The electrical properties of the p(+)n junctions were found to be sensitive to implant dose, improving with increasing dose. At 580degrees>C, implant doses were achieved that were completely activated at levels above previously published Ga equilibrium solubility data. For temperatures of 800 degrees C, reverse annealing occurred, observed as a reduction in carrier concentration with increasing anneal time and severe profile broadening. (C) 1997 American Institute of Physics.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Journal or Publication Title:	JOURNAL OF APPLIED PHYSICS
Publisher:	AMER INST PHYSICS
ISSN:	0021-8979
Date:	15 November 1997
Volume:	82
Number:	10
Number of Pages:	4
Page Range:	pp. 4990-4993
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/16234

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