"A variable frequency, a.c. Hall effect measurement technique has been designed for mobility studies in very high resistivity (>10⁹ ohm·cm) materials exhibiting electrode space charge polarization effects. It incorporates a neutralized input capacitance preamplifier detector which reduces the total input shunting capacitance, including the sample interelectrode capacitances, to a very low, definable value (<0.1 pf) and thereby provides very high and well defined a.c. detector input impedances (4 x 10⁹ and 7 x 10⁹ ohms at 600 and 200 Hz, respectively). Lumped parameter equivalent circuits have been defined to approximate the electrical behavior of sample materials in the measurement configuration. These equivalent circuits, together with independent measurements of the detector input and sample impedances, allow one to correct the detected Hall voltage and obtain the true value from which mobility data may be derived. The validity of these circuits has been established by independent a.c. and d.c. measurements on photoconductive CdS (dark resistivity >10¹⁰ ohm·cm) which exhibited maximum differences of less than 4%. The existing literature has been critically reviewed and the measurement criteria established by this study have been applied to resolve differences in reported data and to suggest improvements in the resolution of previously employed experimental techniques"--Abstract, page ii.
Hill, Otto H.
Hensley, Eugene B.
Wesley, James Paul
Dillman, Norman G., 1938-2010
Andrews, William A., 1922-2009
James, William Joseph
Ph. D. in Physics
Missouri University of Science and Technology. Graduate Center for Materials Research
University of Missouri--Rolla
viii, 98 pages
© 1969 James Dale Boyd, All rights reserved.
Dissertation - Open Access
Library of Congress Subject Headings
Electric resistance -- Measurement
Print OCLC #
Electronic OCLC #
Link to Catalog Recordhttp://laurel.lso.missouri.edu/record=b2614184~S5
Boyd, James Dale, "A.C. Hall effect measurements on very high resistivity materials exhibiting electrode polarization" (1969). Doctoral Dissertations. 2119.