Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1979-02-13
1980-08-12
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
324 62, 324158D, G01R 3126, G01R 2702
Patent
active
042175470
ABSTRACT:
A method for determining the compensation density of narrow-gap semiconductors. Photo-excited carriers are generated by uniformily irradiating a sample with a laser pulse of a particular density and pulse width for a particular time length and at a low sample temperature. The laser wavelength is chosen with a photon energy sufficiently high that carriers are excited from the conduction band by normal intrinsic absorption (one-photon absorption). Subsequent to the laser pulse, conductivity-voltage measurements are taken as a function of time during the photo-electron decay. Such measurements are made for different applied source-detector connections on the same sample with identical pulse-time values for each different correction. The sample is then laser-pulsed as before with a magnetic field normal to the sample surface to obtain Hall-voltage measurements. The measurements are averaged for the same time duration and the average of all curves are used in the determination. From the conductivity-voltage measurments and the Hall-voltage measurements, the mobility .mu., and carrier density n, can be determined. The time dependence of .mu. and n measured during the photo-electron decay yields values of mobility as a function of n. A mobility vs carrier density curve is then prepared and compared with previously prepared curves to obtain a match and thereby determine the quality of the sample. Thus characterization of n-type narrow-gap semiconductors can be made.
REFERENCES:
patent: 3745454 (1973-07-01), Nikirk et al.
Nimtz et al., "Transient Carrier Decay"; Physical Review B; vol. 10; No. 8; ct. 15, 1974; pp. 3302-3310.
Allen Roger E.
Bartoli Filbert J.
Esterowitz Leon
Kruer Melvin R.
Crane Melvin L.
Karlsen Ernest F.
Schneider Philip
Sciascia R. S.
The United States of America as represented by the Secretary of
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