{"created":"2023-06-26T11:01:28.005922+00:00","id":2182,"links":{},"metadata":{"_buckets":{"deposit":"700bfae7-d264-47e2-81f2-801b89bd12aa"},"_deposit":{"created_by":22,"id":"2182","owners":[22],"pid":{"revision_id":0,"type":"depid","value":"2182"},"status":"published"},"_oai":{"id":"oai:oist.repo.nii.ac.jp:00002182","sets":["7:224"]},"author_link":[],"item_10006_creator_3":{"attribute_name":"Author","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Jamshaid, Afshan","creatorNameLang":"en"}]}]},"item_10006_date_granted_11":{"attribute_name":"Degree Conferral Date","attribute_value_mlt":[{"subitem_dategranted":"2021-05-31"}]},"item_10006_degree_grantor_9":{"attribute_name":"Degree Conferrral Institution","attribute_value_mlt":[{"subitem_degreegrantor":[{"subitem_degreegrantor_name":"Okinawa Institute of Science and Technology Graduate University"}],"subitem_degreegrantor_identifier":[{"subitem_degreegrantor_identifier_name":"38005","subitem_degreegrantor_identifier_scheme":"kakenhi"}]}]},"item_10006_degree_name_8":{"attribute_name":"Degree","attribute_value_mlt":[{"subitem_degreename":"Doctor of Philosophy"}]},"item_10006_description_7":{"attribute_name":"Abstract","attribute_value_mlt":[{"subitem_description":"This thesis discusses the understanding of the structural and electronic properties \nof metal halide perovskite materials (e.g., CH3NH3PbI3) as well as the interaction with \nadditive materials at the atomic scale. Metal halide perovskite materials are currently at \nthe core of attention because of their high-efficiency attainable when utilized in solar cell \napplications as well as lost fabrication cost. However, the stability of these perovskite \nmaterials and perovskite-based solar cells is still a major challenge. The proposed \natomic-scale research helps address the thermal instability and ambient air induced \ndegradation issues commonly observed in perovskites. Incorporation of additive \nmaterials into the perovskite was reported to be an efficient strategy to enhance the \nstability. Cl and KI have been found to be eligible candidates but studies on the \nfundamental processes at the atomic scale of these additives are scarce. Therefore, we \ncomprehensively investigated Cl incorporation in MAPbI3 at the atomic scale by \ncombining scanning tunneling microscopy (STM), X-ray photoelectron, ultraviolet, and \ninverse photoemission spectroscopy. For the Cl concentration of 14.8 ± 0.6%, STM \nimages confirm the presence of Cl ions on the MAPbI3 (MAPbI2.59Cl0.21) surface leading \nto the highest surface stability found from the viewpoint of both thermodynamics and \nkinetics by density functional theory and molecular dynamics calculations. This study \nevidence that Cl can substitute I ions of the surface structure and/or fill the surface I-\nvacancies and further enhance the structural stability of MAPbI3. Upon the PbCl2\ndeposition on MAPbI3, only Cl ions were observed in MAPbI3 surface crystal structure \nwhile Pb ions were not observed by LT-STM. Before investigating the PbCl2 interaction \nwith MAPbI3, the atomic structures of metallic-Pb and PbCl2 on Au (111) substrate need \nbe studied by LT-STM. For the PbCl2/Au (111) system, a myriad of structures such as \nthe intact form of PbCl2 as well as dissociated species in the forms of Cl ions, Cl-Cl \ndimer, Pb, and Pb-Pb dimers were observed. Furthermore, the KI additive was \ninvestigated by LT-STM, which reveals the I-I square atomic structure. After deposition \nprotocol optimization, KI was deposited on MAPbI3 and characterized by XPS \nconfirming K incorporation in MAPbI3. As a future plan, LT-STM studies can be \nconducted to find the optimal concentration of KI for enhancing the MAPbI3 surface \nstability. Also, it is important to point out that STM can be used to characterize mainly \nthe surface atomic structures of perovskite materials.","subitem_description_type":"Other"}]},"item_10006_dissertation_number_12":{"attribute_name":"Degree Referral Number","attribute_value_mlt":[{"subitem_dissertationnumber":"甲第75号"}]},"item_10006_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.15102/1394.00001966","subitem_identifier_reg_type":"JaLC"}]},"item_10006_rights_13":{"attribute_name":"Copyright Information","attribute_value_mlt":[{"subitem_rights":"© 2021 The Author."}]},"item_10006_text_24":{"attribute_name":"Exam Date","attribute_value_mlt":[{"subitem_text_value":"2021-04-30"}]},"item_10006_version_type_18":{"attribute_name":"Version Format","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"open access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_abf2"}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2022-06-01"}],"displaytype":"detail","filename":"Jamshaid Full Text.pdf","filesize":[{"value":"11.7 MB"}],"format":"application/pdf","licensefree":"CC BY4.0\nCreative Commons Attribution 4.0 International (https://creativecommons.org/licenses/by/4.0/)","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"Full Text","objectType":"fulltext","url":"https://oist.repo.nii.ac.jp/record/2182/files/Jamshaid Full Text.pdf"},"version_id":"5f43e1fd-3c32-4d81-a10c-bd66b1eb81a0"},{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2021-08-13"}],"displaytype":"detail","filename":"Jamshaid Final Exam Abstract.pdf","filesize":[{"value":"42.9 kB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"Final Exam Abstract","objectType":"abstract","url":"https://oist.repo.nii.ac.jp/record/2182/files/Jamshaid Final Exam Abstract.pdf"},"version_id":"45f8903f-f2f0-4030-bcf6-bd71cad8917a"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"doctoral thesis","resourceuri":"http://purl.org/coar/resource_type/c_db06"}]},"item_title":"走査型プローブ顕微鏡を用いた金属ハロゲン化物ペロブスカイト型材料の研究","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"走査型プローブ顕微鏡を用いた金属ハロゲン化物ペロブスカイト型材料の研究","subitem_title_language":"ja"},{"subitem_title":"Scanning Probe Microscopy Studies of Metal Halide Perovskite Materials","subitem_title_language":"en"}]},"item_type_id":"10006","owner":"22","path":["224"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2021-05-31"},"publish_date":"2021-05-31","publish_status":"0","recid":"2182","relation_version_is_last":true,"title":["走査型プローブ顕微鏡を用いた金属ハロゲン化物ペロブスカイト型材料の研究"],"weko_creator_id":"22","weko_shared_id":-1},"updated":"2023-08-31T05:46:42.229677+00:00"}