Defect Reduction Study of Molecular Beam Epitaxially Grown Cdte Thin Flims by Ex-Situ Annealing

dc.contributor.advisor Selamet, Yusuf
dc.contributor.author Bakali, Emine
dc.date.accessioned 2016-04-29T13:22:30Z
dc.date.available 2016-04-29T13:22:30Z
dc.date.issued 2015
dc.description Thesis (Master)--Izmir Institute of Technology, Physics, Izmir, 2015 en_US
dc.description Full text release delayed at author's request until 2018.11.16 en_US
dc.description Includes bibliographical references (leaves: 75-77) en_US
dc.description Text in English; Abstract: Turkish and English en_US
dc.description xiv, 83 leaves en_US
dc.description.abstract Molecular Beam Epitaxy (MBE) grown CdTe thin films were annealed in this study to decrease the number density of defects. For annealing, a system was designed and constructed. During anneals; anneal temperature, anneal time, anneal cycle and hydrogen gas effects were analyzed. The effects of annealing parameters were analyzed by Scanning Electron Microscope (SEM), Atomic Force Microscope (AFM), Everson Etch method, resonance Raman spectroscopy and Photoluminescence measurement. In our studies, dislocation density decreased for 5 min. annealing when annealing temperature increased. Dislocation density decreased with increasing annealing time. Besides, dislocation density decreased when cycle number increased. Te precipitation decreased with annealing. Raman mode at 144 cm-1 was investigated and that mode was decided as Te E mode. Also I2LO/ILO ratio decreased with increasing annealing temperature and annealing time. I2LO/ILO ratio were approached to 1 at 80oK due to so called ‘resonance Raman scattering’. Extra peaks were also observed by Raman scattering. On the surface, small pits occurred when annealing temperature increased. Surface roughness decreased with increasing cycle number. en_US
dc.description.abstract Büyütme sırasında oluşan kusurları azaltmak için, Moleküler Demet Epitaksi (MBE) ile büyütülen CdTe ince filmler tavlandı. Tavlama için bir sistem tasarlandı. Tavlamalar sırasında; tavlama sıcaklığı, tavlama süresi, tavlama devri ve hidrojen gazı etkileri incelendi. Tavlama parammetreleri etkileri Taramalı Uç Mikroskobu (SEM), Atomik Kuvvet Mikroskobu (AFM), Everson eç metodu, resonans Raman Spektroskopisi ve fotoluminesans ölçümleri ile incelendi. Araştırmalar sonucunda 5 dakika boyunca tavlanan örneklerde dislokasyon yoğunluğu tavlama sıcaklığı artarken düşmüştür. Dislokasyon yoğunluğu tavlama süresi arkarken düşmüştür. Ayrıca tavlama devri artarken dislokasyon yoğunluğu düşmüştür. Te çökeltisi tavlamalar sonuda azalmıştır. 144 cm-1 deki raman modu Te E moduna ait olduğu kararlaştırılmıştır. I2LO/ILO oranı tavlama sıcaklığı ve tavlama süresi artarken düşmüştür ve rezonans Raman saçılmasında I2LO/ILO oranı 80oK de 1’e yaklaşmıştır. Raman saçılmalarında yeni pikler gözlemlenmiştir. Sıcaklık artarken örnek yüzeyinde küçük çukurlar oluşmuştur. Yüzey pürüzlülüğü tavlama devri artığında düşmüştür. en_US
dc.description.sponsorship ASELSAN and SSM en_US
dc.identifier.citation Bakali, E. (2015). Defect reduction study of molecular beam epitaxially grown CdTe thin flims by ex-situ annealing. Unpublished master's thesis, İzmir Institute of Technology, İzmir, Turkey en_US
dc.identifier.uri https://hdl.handle.net/11147/4583
dc.language.iso en en_US
dc.publisher Izmir Institute of Technology en_US
dc.rights info:eu-repo/semantics/openAccess en_US
dc.subject Infrared en_US
dc.subject Detectors en_US
dc.subject Thin films en_US
dc.subject Annealing en_US
dc.subject Scanning Electron Microscope en_US
dc.subject Atomic Force Microscope en_US
dc.subject Raman spectroscopy en_US
dc.title Defect Reduction Study of Molecular Beam Epitaxially Grown Cdte Thin Flims by Ex-Situ Annealing en_US
dc.title.alternative Moleküler Demet Epitaksiye Büyütülen Cdte İnce Filmlerin Tavlama ile Kusur Azaltma Çalışması en_US
dc.type Master Thesis en_US
dspace.entity.type Publication
gdc.author.institutional Bakali, Emine
gdc.coar.access open access
gdc.coar.type text::thesis::master thesis
gdc.description.department Thesis (Master)--İzmir Institute of Technology, Physics en_US
gdc.description.publicationcategory Tez en_US
gdc.description.scopusquality N/A
gdc.description.wosquality N/A
relation.isAuthorOfPublication.latestForDiscovery b05cafc7-74a3-4cf2-8942-f862badc3424
relation.isOrgUnitOfPublication.latestForDiscovery 9af2b05f-28ac-4009-8abe-a4dfe192da5e

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