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

凭借化学研究仪器和设施：仪器开发（CRIF：ID）奖，亚利桑那大学化学系的奥利弗蒙蒂教授将开发一种灵敏的扫描光电离显微镜，以研究有机光伏电池中异质界面的电子结构。该仪器由钛宝石激光器、显微镜和一个新的光电子探测器组成，其中来自三倍频钛宝石激光器（800 nm）的紫外辐射（266 nm）用于6-10 eV范围内的多光子光电离。通过固定聚焦的紫外光束扫描样品，可以获得空间分辨的荧光和光电子成像，这种扫描光电离显微镜适用于价带和光电子谱，可以在亚微米尺度上收集空间分辨的化学和电子信息。重要的应用包括有机光伏（OPV）系统，有机/半导体界面，和潜在的单个纳米粒子的价带结构的检查。这将有助于对有机材料中分子过程的基本理解，最终改善更高效太阳能电池的工程。

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.