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

• Material Type: 博士論文
• 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
• Author/Editor: Jamshaid, Afshan
• Author Heading: Jamshaid, Afshan
• Publication Date: 2021-05-31
• Publication Date (W3CDTF): 2021-05-31
• Alternative Title: Scanning Probe Microscopy Studies of Metal Halide Perovskite Materials
• Degree grantor/type: Okinawa Institute of Science and Technology Graduate University
• Date Granted: 2021-05-31
• Date Granted (W3CDTF): 2021-05-31
• Dissertation Number: 甲第75号
• Degree Type: Doctor of Philosophy
• Text Language Code: eng
• Target Audience: 一般
• Note (General): This thesis discusses the understanding of the structural and electronic properties of metal halide perovskite materials (e.g., CH3NH3PbI3) as well as the interaction with additive materials at the atomic scale. Metal halide perovskite materials are currently at the core of attention because of their high-efficiency attainable when utilized in solar cell applications as well as lost fabrication cost. However, the stability of these perovskite materials and perovskite-based solar cells is still a major challenge. The proposed atomic-scale research helps address the thermal instability and ambient air induced degradation issues commonly observed in perovskites. Incorporation of additive materials into the perovskite was reported to be an efficient strategy to enhance the stability. Cl and KI have been found to be eligible candidates but studies on the fundamental processes at the atomic scale of these additives are scarce. Therefore, we comprehensively investigated Cl incorporation in MAPbI3 at the atomic scale by combining scanning tunneling microscopy (STM), X-ray photoelectron, ultraviolet, and inverse photoemission spectroscopy. For the Cl concentration of 14.8 ± 0.6%, STM images confirm the presence of Cl ions on the MAPbI3 (MAPbI2.59Cl0.21) surface leading to the highest surface stability found from the viewpoint of both thermodynamics and kinetics by density functional theory and molecular dynamics calculations. This study evidence that Cl can substitute I ions of the surface structure and/or fill the surface I-vacancies and further enhance the structural stability of MAPbI3. Upon the PbCl2deposition on MAPbI3, only Cl ions were observed in MAPbI3 surface crystal structure while Pb ions were not observed by LT-STM. Before investigating the PbCl2 interaction with MAPbI3, the atomic structures of metallic-Pb and PbCl2 on Au (111) substrate need be studied by LT-STM. For the PbCl2/Au (111) system, a myriad of structures such as the intact form of PbCl2 as well as dissociated species in the forms of Cl ions, Cl-Cl dimer, Pb, and Pb-Pb dimers were observed. Furthermore, the KI additive was investigated by LT-STM, which reveals the I-I square atomic structure. After deposition protocol optimization, KI was deposited on MAPbI3 and characterized by XPS confirming K incorporation in MAPbI3. As a future plan, LT-STM studies can be conducted to find the optimal concentration of KI for enhancing the MAPbI3 surface stability. Also, it is important to point out that STM can be used to characterize mainly the surface atomic structures of perovskite materials.
• DOI: 10.15102/1394.00001966; https://doi.org/10.15102/1394.00001966
• Persistent ID (NDL): info:ndljp/pid/12701395; https://dl.ndl.go.jp/pid/12701395
• Collection: 障害者向け資料
• Collection (Materials For Handicapped People:1): テキストデータ
• Collection (particular): 国立国会図書館デジタルコレクション > デジタル化資料 > 博士論文; https://dl.ndl.go.jp/collections/A00014
• Acquisition Basis: 博士論文（自動収集）
• Date Accepted (W3CDTF): 2023-03-09T09:37:52+09:00
• Format (IMT): application/pdf
• Access Restrictions: 国立国会図書館内限定公開
• Service for the Digitized Contents Transmission Service: 図書館・個人送信対象外
• Availability of remote photoduplication service: 可
• Periodical Title (URI): http://dx.doi.org/10.15102/1394.00001966; https://oist.repo.nii.ac.jp/records/2182
• Data Provider (Database): 国立国会図書館 : 国立国会図書館デジタルコレクション; https://dl.ndl.go.jp

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2023-10-11 再収集

2023-10-11 再収集