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Brown, Frederick C. Wei, John Shi Sun 2012-04-22T17:23:41Z 2012-04-22T17:23:41Z 10000-01-01 1974 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. Submitted by William Weathers (weathrs2@illinois.edu) on 2012-04-22T17:23:41Z No. of bitstreams: 1 1974_wei.pdf: 2438886 bytes, checksum: 5ed90e01d455e8d055678d5dee792d71 (MD5) Made available in DSpace on 2012-04-22T17:23:41Z (GMT). No. of bitstreams: 1 1974_wei.pdf: 2438886 bytes, checksum: 5ed90e01d455e8d055678d5dee792d71 (MD5) Previous issue date: 1974 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by William Weathers (weathrs2@illinois.edu) on 2012-04-22T17:23:41Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:33:59-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis Thesis U of I Only http://hdl.handle.net/2142/30730 2298889 en ©1974 Wei polaron transport silver bromide transient Hall effect photoconductivity amorphous semiconductors Polaron transport in silver bromide Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.