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Optical Engineering

Pulsed laser annealing of GaAs implanted with Se and Si
Author(s): Andrew Rys; Yanan Shieh; Alvin D. Compaan; H. Walter Yao; Ajit Bhat
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Paper Abstract

Carrier activation and mobility were studied by Raman spectroscopy and the Hall effect in pulsed laser annealed samples of GaAs implanted with doses of Si and Se from 2.2x 1012 to 6.Ox 1014 cm-2. The samples were annealed using a pulsed XeCl excimer laser (? = 308 nm) and a pulsed dye laser (? = 728 nm) with energy densities from 0.06 to 0.9 J/cm2 and pulse durations of about 10 ns. Very high carrier concentrations of 3x1019 and 1.5x 1019 cm-3 were obtained for the best n-type GaAs samples annealed with the dye and excimer lasers, respectively. The dye laser consistently produced higher activation than excimer laser annealing. A transient reflectivity signal was used to identify the GaAs melt threshold and the melt phase dynamics of the GaAs under the nitride cap. The threshold energies for cap damage were 0.34 and 0.12 J/cm2 for the excimer and dye lasers, respectively. Raman spectroscopy was used to identify the threshold energies for the GaAs implant layer recrystallization and for optimum carrier activation. Four major peaks were observed on the photoinduced current transient spectra in the temperature range of 60 to 400 K, corresponding to traps with activation energies between 0.06 to 0.80 eV.

Paper Details

Date Published: 1 April 1990
PDF: 10 pages
Opt. Eng. 29(4) doi: 10.1117/12.55603
Published in: Optical Engineering Volume 29, Issue 4
Show Author Affiliations
Andrew Rys
Yanan Shieh, Kansas State Univ. (United States)
Alvin D. Compaan, Univ. of Toledo (United States)
H. Walter Yao, Univ. of Nebraska/Lincoln (United States)
Ajit Bhat, Univ. of Toledo (United States)

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