{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/30730"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/30730","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Polaron transport in silver bromide","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.","abstract_html":"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.","abstract_has_math":false,"creators":["Wei, John Shi Sun"],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Brown, Frederick C."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2012,"date_issued":"2012-04-22T17:23:41Z","date_published":"2012-04-22T17:23:41Z","updated_at":"2026-07-22T22:25:29Z","subjects":["polaron transport","silver bromide","transient Hall effect","photoconductivity","amorphous semiconductors"],"languages":["en"],"rights":["©1974 Wei"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["2298889"],"render_values":[{"text":"2298889","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/30730","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Brown, Frederick C."]},{"key":"dc:creator","label":"Author","values":["Wei, John Shi Sun"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2012-04-22T17:23:41Z","10000-01-01","1974"]},{"key":"dc:type","label":"Dc Type","values":["Dissertation / Thesis","text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["polaron transport","silver bromide","transient Hall effect","photoconductivity","amorphous semiconductors"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["©1974 Wei"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/30730","2298889"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["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"]},{"key":"dc:title","label":"Title","values":["Polaron transport in silver bromide"]}]}],"canonical_facts":{"dc:contributor":["Brown, Frederick C."],"dc:creator":["Wei, John Shi Sun"],"dc:date":["2012-04-22T17:23:41Z","10000-01-01","1974"],"dc:description":["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. 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