Evidence from spectral emissometry for conduction intraband transitions in the intrinsic regime for silicon |
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Authors: | S Abedrabbo J C Hensel A T Fiory N M Ravindra |
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Affiliation: | (1) Kearfott Guidance and Navigation Corporation, Little Falls, NJ;(2) New Jersey Institute of Technology, Newark, NJ;(3) Lucent Technologies, Murray Hill, NJ |
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Abstract: | From emissometry measurements in lightly doped Si at elevated temperatures, we have observed an anomalous absorption band
in the wavelength range of 1–5 μm. The wavelength at which the band peaks, λ≈2.3 μm, shows a negligible dependence on temperature
while the peak intensity increases with temperature presumably as a result of the increasing intrinsic carrier concentration.
Spitzer and Fan reported a similar absorption band in direct absorption measurements at room temperature for n-type Si with
extrinsic electron concentrations of 1014 to 1019cm−3. No such structure was found in extrinsic p-type Si. Spitzer and Fan were unable to identify the mechanism for this anomalous
absorption. In both the experiments, this absorption of free electrons is due to intraband transitions in the conduction band
from the Δ1 conduction band edge across an energy gap of E ∼ 0.5 eV to a higher lying Δ2′ conduction band. |
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Keywords: | Spectral emissometry absorption band intraband transitions conduction band edge temperature emissivity |
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