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https://hdl.handle.net/2142/16609
Description
Title
Photoconductive Hall effect in silver bromide
Author(s)
Burnham, Dwight Comber
Issue Date
1959
Doctoral Committee Chair(s)
Brown, F.C.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Photoconductive Hall effect
silver bromide
Language
en
Abstract
Using techniques developed by Kobayashi and Brown, the Hall mobility of electronic carriers in silver bromide was investigated in the low-temperature range. The sign of the dominant carrier is negative, and the Hall mobility of electrons varies from 150 cm2/volt-second at 125 ° K to about 29,000 cm2/volt-second at 6°K. The temperature dependence of the mobility seems to be intrinsic above about 33 °K and agrees with that predicted by scattering due to optical and acoustic modes of lattice vibration. Optical modes are dominant at temperatures above 40 °K, and the Debye temperature associated with these modes is 195 ° ± 15 °K. Acoustic scattering apparently is dominant between 35 ° and l5 °K. Some type of impurity scattering has an effect below 33 °K; plausibility arguments and agreement with data indicate that this scattering may be due to ionized impurities.
At temperatures above 19 °K the effects of high magnetic fields are in agreement with a semi-classical theory which assumes isotropic scattering and a spherical energy-band structure. The magnetoresistance effects also confirm the values of the mobility obtained directly. Below 15 °K it is believed that the mobility of holes is sufficiently high to affect the measured value of the Hall mobility. This hypothesis is supported by transient photoconductivity data which indicate that the ratio of electron range to hole range varies from several hundred at 80 °K to about five at 8 °K.
Other features of the transient photoconductivity of silver bromide were studied. The spectral response at 80° K and 8° K is similar to that of .silver chloride, except for a shift to longer wavelengths. The unit range of electrons at 80° K is somewhat longer in zone-refined silver bromide than in vacuum-grown silver chloride.
Two of the samples used in the Hall effect studies were cut from an ingot purified by zone-refining techniques. Zone-refining procedures and results are described.
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