Doctoral Dissertations

Abstract

"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.

Advisor(s)

Hill, Otto H.

Committee Member(s)

Hensley, Eugene B.
Wesley, James Paul
Dillman, Norman G., 1938-2010
Andrews, William A., 1922-2009
James, William Joseph

Department(s)

Physics

Degree Name

Ph. D. in Physics

Sponsor(s)

Missouri University of Science and Technology. Graduate Center for Materials Research

Publisher

University of Missouri--Rolla

Publication Date

1969

Pagination

viii, 98 pages

Note about bibliography

Includes bibliographical references (pages 96-97).

Rights

© 1969 James Dale Boyd, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Subject Headings

Hall effectElectric resistance -- MeasurementPolarization (Electricity)

Thesis Number

T 2306

Print OCLC #

5152443

Electronic OCLC #

841488031

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