University of Illinois Urbana-Champaign

Polaron transport in silver bromide

Wei, John Shi Sun

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https://hdl.handle.net/2142/30730

Description

Title
Polaron transport in silver bromide
Author(s)
Wei, John Shi Sun
Issue Date
1974
Doctoral Committee Chair(s)
Brown, Frederick C.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
  • polaron transport
  • silver bromide
  • transient Hall effect
  • photoconductivity
  • amorphous semiconductors
Language
en
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.
Type of Resource
text
Permalink
http://hdl.handle.net/2142/30730
Copyright and License Information
©1974 Wei

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