2023-01-012024-05-13https://scholars.lib.ntu.edu.tw/handle/123456789/651538有機無機混成鹵素鈣鈦礦已成功表現出顯著的能源光伏效應。同時，簡單的樣品製備以及低成本考量，已讓有機無機混成鈣鈦礦為備具有高度潛力的重點光電材料。 在物理機制上，很多理論猜測有機無機鈣鈦礦材料中的有機分子之定向是決定有機無機鈣鈦礦材料備具高轉換效率之表現。然而，實驗上，對於直接提供微觀起源之證據以及探討有關光和物質間的耦合物理機制是相當困難。主要原因源自於探討分子相關的物理機制，實驗上需要提供直接區域性的觀察以及呈現出原子級解析度的實驗結果。 掃描穿隧顯微鏡和能譜可能是當今唯一可以進行量測以及觀察有機分子如何影響鈣鈦礦物質表現的實驗量測工具。基於這個研究需求和重要性，在本研究計畫中，擬利用目前實驗室量測工具，剖面掃描穿隧顯微鏡，對能源鈣鈦礦幾項代表性本質穩定的材料結構，如摻雜效應、物質維度效應，以及全無機化鈣鈦礦材料，進行量測。 另外，本研究計畫中，除探討鈣鈦礦本質穩定材料結構之外，同時提升剖面掃描穿隧顯微鏡為備有光可調控性以及外加側向偏壓於掃描平台之功能。這二大功能將協助瞭解能源鈣鈦礦材料於實際材料元件運作之情況下，探討在光與物質間的耦合效應下，原子級的有機分子之定向如何影響有機無機鈣鈦礦材料結構以及電性之表現。 本計畫著重以直接原子級的實驗證據探討在光與物質間的耦合效應下，原子級的有機分子之定向如何影響有機無機鈣鈦礦材料結構以及電性之表現。研究成果對於有機無機鈣鈦礦材料的高能源光伏表現以及載子於真實材料元件運作之下的物理機制，將提出更完整的了解。 The organic-inorganic halide perovskites have shown a remarkable photovoltaics in solar cell performance, surpassing previously the top efficiency achieved with conventional silicon-based solar cells. In addition, due to the preparation via simple and low-cost solution processes, organic-inorganic halide perovskites demonstrate the immense potential alternative to the future commercially photovoltaic technologies. Many theoretical reports predicted that the orientation of the organic molecules plays a fundamental role in determining the perovskite-based optoelectronic properties. However, experimentally, to directly explore the microscopic origin about the underlying photophysics involving photon-lattice coupling and the role played by the organic molecules in the light-illuminating process still remains poorly understood. Scanning tunneling microscopy and spectroscopy (STM/S) could be presently the only approachable technique to investigate the organic molecule-related issues in halide perovskites. Thus, in this proposal, we intend to improve the present capability of the cross-sectional STM technique in our lab with the light-modulated function and the externally electric availability to mimic the real perovskite-based operation conditions. With the advances of the cross-sectional STM/S technique, the latest cutting-edge problems with atomic resolution involving the role of organic molecules in halide perovskites can be revealed. In this project, several organic molecule-related problems regarding compositional engineering, mixed dimensions (two-dimensional mixed three-dimensional, 2D/3D), and all-inorganic perovskite materials will be studied. In addition, experimentally, utilizing the light-modulated XSTM/S technique, the simultaneous molecule dipole orientation pattern and the electrostatic potential with atomic resolution under light illumination or under an externally applied electric field can be directly mapped. We identify and work on the exploration of the microscopic origin of the halide perovskites in this project. With the atomically-resolved XSTM results, the challenging organic molecules-related problems in halide perovskites will be discussed. In addition, to mimic the real device operation conditions, the atomically-resolved XSTM measurements can be performed under light-modulated situations and an externally electric availability. We expect to provide the direct observations for developing a comprehensive physical understanding of charge carrier dynamics and high photovoltaic performance in halide perovskites under actual operation conditions.掃描穿隧顯微鏡和能譜;有機無機混成鹵素鈣鈦礦;光可調控性;外加側向偏壓;有機分子定向;cross-sectional STM; organic-inorganic halide perovskites; light-modulated functions; externally electric availability; molecule dipole orientation