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Study of carrier concentration profiles in Al‐implanted Ge by micro‐Raman spectroscopy under different excitation wavelengths
Author(s) -
Sanson A.,
Giarola M.,
Napolitani E.,
Impellizzeri G.,
Privitera V.,
Carnera A.,
Mariotto G.
Publication year - 2013
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.4249
Subject(s) - raman spectroscopy , excitation , excitation wavelength , analytical chemistry (journal) , materials science , wavelength , germanium , laser , penetration depth , spectroscopy , spreading resistance profiling , chemistry , optics , optoelectronics , doping , silicon , physics , electrical engineering , chromatography , quantum mechanics , engineering
The distribution profile of Al implanted in crystalline Ge has been investigated by micro‐Raman spectroscopy. Using different excitation laser lines, corresponding to different optical penetration depths, the Al concentration at different depths beneath the sample surface has been studied. We have found a strong correlation between the intensity of the Al–Ge Raman peak at ~370 cm −1 , which is due to the local vibrational mode of substitutional Al atoms, and the carrier concentration profile, obtained by the spreading resistance profiling analysis. A similar connection has been also observed for both shape and position of the Ge–Ge Raman peak at ~300 cm −1 . According to these experimental findings, we propose here a fast and nondestructive method, based on micro‐Raman spectroscopy under different excitation wavelengths, to estimate the carrier concentration profiles in Al‐implanted Ge. Copyright © 2013 John Wiley & Sons, Ltd.