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Title:Polaron transport in silver bromide
Author(s):Wei, John Shi Sun
Doctoral Committee Chair(s):Brown, Frederick C.
Department / Program:Physics
Subject(s):polaron transport
silver bromide
transient Hall effect
amorphous semiconductors
Abstract:New experimental techniques have been developed in order to observe the transient Hall effect and photoconductivity. High sensitivity is achieved by applying large electric and magnetic fields and through improvements in signal to noise ratio by means of pulsed averaging. In order to observe the Hall effect in thin film samples a novel electrode geometry has been developed. The technique developed here may be applied to study the mechanism of conduction in amorphous semiconductors. The steep decline in Hall mobility observed at intermediate temperatures indicate the predominance of carrier scattering by longitudinal optical (LO) phonons. The Debye temperature of LO phonons, deduced from present data, is higher than that observed previously in transport studies; it is, however, consistent with optical data. At low temperatures, nonohmic behaviour in photoconductivity is observed at field less than 10 V/cm and is attributed to an actual decrease in mobility with increasing electric field. The importance of scattering by accoustic phonons at low temperatures is analyzed. Suggestions for a more complete theoretical treatment of the polaron problem in AgBr are made.
Issue Date:1974
Genre:Dissertation / Thesis
Other Identifier(s):2298889
Rights Information:©1974 Wei
Date Available in IDEALS:2012-04-22

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