{"id":{"repo_id":"mo-state","oai_identifier":"oai:bearworks.missouristate.edu:theses-1850"},"canonical_url":"https://search.dev.ndltd.org/etd/mo-state/oai:bearworks.missouristate.edu:theses-1850","repository":{"repo_id":"mo-state","name":"Missouri State University","base_url":"https://bearworks.missouristate.edu/do/oai/"},"display":{"title":"An Investigation of the Surface Properties of Sic For the Growth of Gan Thin Films and Epilayers","abstract":"6H-SiC is currently the best subtrate used in the growth of III-V quantum heterostructures due to a negligible lattice mismatch (~3.5%) between the substrate and the epilayer, compared to sapphire (14%). Considerable amount of research is currently being done all over the world on these III-V compounds, particularly the GaN based compounds, due to their characteristic absorption in the blue region of the electromagnetic spectrum. However, the success of achieving high quality thin films that would produce the needed quantum effect depends not only on the growth parmeters but also on the preparation of the surface of the SiC substrate. The project aimed to determine the most efficient method in the preparation of the substrate. Surface analysis of the SiC using Auger Electron Spectroscopy (AES) and X-ray Photoelectron Spectroscopy (XPS) showed that thermal annealing of the SiC substrate induces graphitization at temperatures as low as 840 °C, but surface oxides are removed only at 940 °C. UHV Si-beam etching was proposed as a cleaning method that would effectively clean the surface of oxides/carbon contaminants at low temperatures without the onset of graphitization. A UHV Si-beam etching apparatus, with a newly purchased evaporator used as the Si source, was built from concept, was designed and was successfully fabricated in-house. Assembly and test of the apparatus showed that it is capable of cleaning the substrate through resistive heating. Due to uncontrollable events, further experiments for its successful operation were recommended.","abstract_html":"6H-SiC is currently the best subtrate used in the growth of III-V quantum heterostructures due to a negligible lattice mismatch (~3.5%) between the substrate and the epilayer, compared to sapphire (14%). Considerable amount of research is currently being done all over the world on these III-V compounds, particularly the GaN based compounds, due to their characteristic absorption in the blue region of the electromagnetic spectrum. However, the success of achieving high quality thin films that would produce the needed quantum effect depends not only on the growth parmeters but also on the preparation of the surface of the SiC substrate. The project aimed to determine the most efficient method in the preparation of the substrate. Surface analysis of the SiC using Auger Electron Spectroscopy (AES) and X-ray Photoelectron Spectroscopy (XPS) showed that thermal annealing of the SiC substrate induces graphitization at temperatures as low as 840 °C, but surface oxides are removed only at 940 °C. UHV Si-beam etching was proposed as a cleaning method that would effectively clean the surface of oxides/carbon contaminants at low temperatures without the onset of graphitization. A UHV Si-beam etching apparatus, with a newly purchased evaporator used as the Si source, was built from concept, was designed and was successfully fabricated in-house. Assembly and test of the apparatus showed that it is capable of cleaning the substrate through resistive heating. Due to uncontrollable events, further experiments for its successful operation were recommended.","abstract_has_math":false,"creators":["Cabalu, Jasper S."],"institution":null,"degree_name":"Master of Science in Materials Science","degree_level":"Masters","degree_discipline":"Physics, Astronomy, and Materials Science","degree_department":null,"school":null,"contributors":["Shyang Hwang"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2000,"date_issued":"2000-07-01T07:00:00Z","date_published":"2000-07-01T07:00:00Z","updated_at":"2026-07-24T03:15:54Z","subjects":["Materials Science and Engineering"],"languages":[],"rights":["© Jasper S Cabalu"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://bearworks.missouristate.edu/theses/849","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Shyang Hwang"]},{"key":"dc:creator","label":"Author","values":["Cabalu, Jasper S."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics, Astronomy, and Materials Science"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science in Materials Science"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Materials Science and Engineering"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:rights","label":"Dc Rights","values":["© Jasper S Cabalu"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://bearworks.missouristate.edu/theses/849"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["6H-SiC is currently the best subtrate used in the growth of III-V quantum heterostructures due to a negligible lattice mismatch (~3.5%) between the substrate and the epilayer, compared to sapphire (14%). Considerable amount of research is currently being done all over the world on these III-V compounds, particularly the GaN based compounds, due to their characteristic absorption in the blue region of the electromagnetic spectrum. However, the success of achieving high quality thin films that would produce the needed quantum effect depends not only on the growth parmeters but also on the preparation of the surface of the SiC substrate. The project aimed to determine the most efficient method in the preparation of the substrate. Surface analysis of the SiC using Auger Electron Spectroscopy (AES) and X-ray Photoelectron Spectroscopy (XPS) showed that thermal annealing of the SiC substrate induces graphitization at temperatures as low as 840 °C, but surface oxides are removed only at 940 °C. UHV Si-beam etching was proposed as a cleaning method that would effectively clean the surface of oxides/carbon contaminants at low temperatures without the onset of graphitization. A UHV Si-beam etching apparatus, with a newly purchased evaporator used as the Si source, was built from concept, was designed and was successfully fabricated in-house. Assembly and test of the apparatus showed that it is capable of cleaning the substrate through resistive heating. Due to uncontrollable events, further experiments for its successful operation were recommended."]},{"key":"dc:title","label":"Title","values":["An Investigation of the Surface Properties of Sic For the Growth of Gan Thin Films and Epilayers"]}]}],"canonical_facts":{"dc:contributor":["Shyang Hwang"],"dc:creator":["Cabalu, Jasper S."],"dc:description.abstract":["6H-SiC is currently the best subtrate used in the growth of III-V quantum heterostructures due to a negligible lattice mismatch (~3.5%) between the substrate and the epilayer, compared to sapphire (14%). Considerable amount of research is currently being done all over the world on these III-V compounds, particularly the GaN based compounds, due to their characteristic absorption in the blue region of the electromagnetic spectrum. However, the success of achieving high quality thin films that would produce the needed quantum effect depends not only on the growth parmeters but also on the preparation of the surface of the SiC substrate. The project aimed to determine the most efficient method in the preparation of the substrate. Surface analysis of the SiC using Auger Electron Spectroscopy (AES) and X-ray Photoelectron Spectroscopy (XPS) showed that thermal annealing of the SiC substrate induces graphitization at temperatures as low as 840 °C, but surface oxides are removed only at 940 °C. UHV Si-beam etching was proposed as a cleaning method that would effectively clean the surface of oxides/carbon contaminants at low temperatures without the onset of graphitization. A UHV Si-beam etching apparatus, with a newly purchased evaporator used as the Si source, was built from concept, was designed and was successfully fabricated in-house. Assembly and test of the apparatus showed that it is capable of cleaning the substrate through resistive heating. Due to uncontrollable events, further experiments for its successful operation were recommended."],"dc:identifier":["https://bearworks.missouristate.edu/theses/849"],"dc:rights":["© Jasper S Cabalu"],"dc:subject":["Materials Science and Engineering"],"dc:title":["An Investigation of the Surface Properties of Sic For the Growth of Gan Thin Films and Epilayers"],"thesis:degree_discipline":["Physics, Astronomy, and Materials Science"],"thesis:degree_level":["Masters"],"thesis:degree_name":["Master of Science in Materials Science"]},"updated_at":"2026-07-24T03:15:54Z"}