Development of a Spatially Resolved Photoionization Microscope for Chemically Selective Mesoscale Spectroscopy in Organic Photovoltaic Cells

亚利桑那大学化学系的Oliver Monti教授获得了化学研究仪器和设施：仪器开发（CRIF:ID）奖，他将开发一种灵敏的扫描光电离显微镜来研究有机光伏电池中异质界面的电子结构。该仪器由Ti：蓝宝石激光器、显微镜和新型光电子探测器组成，其中使用频率为三倍的Ti：蓝宝石激光器（800 nm）发出的266 nm紫外辐射在6-10 eV范围内进行多光子光电离。空间分辨荧光和光电子成像将产生扫描样品在固定聚焦紫外线束。所提出的扫描光电离显微镜适用于价带和光发射光谱，能够在亚微米尺度上收集空间分辨的化学和电子信息。重要的应用包括检查有机光伏（OPV）系统的价带结构，有机/半导体界面，以及潜在的单纳米颗粒。这将有助于对有机材料分子过程的基本理解，最终提高更高效太阳能电池的工程水平。

With a Chemistry Research Instrumentation and Facilities :Instrument Development (CRIF:ID) award, Professor Oliver Monti in the Department of Chemistry at the University of Arizona will develop a sensitive scanning photoionization microscope to investigate the electronic structure of heterogeneous interfaces in organic photovoltaic cells. The instrument consists of a Ti:Sapphire laser, microscope, and a new photoelectron detector, in which ultraviolet radiation (266 nm) from a frequency tripled Ti:Sapphire laser (800 nm) is used for multiphoton photoionization in 6-10 eV range. Spatially resolved fluorescence and photoelectron imaging would result from scanning the sample over the stationary focused uv beam.The proposed scanning photoionization microscope is suitable for valence band and photoemission spectroscopy enabling the collection of spatially resolved chemical and electronic information on a submicron length-scale. Important applications include the examination of the valence band structure of organophotovoltaic (OPV) systems, organic/semiconductor interfaces, and potentially single nanoparticles. This should contribute to the basic understanding of molecular processes in organic materials, ultimately improving the engineering of more efficient solar cells.