IMR: Development of an Imaging Transport Instrument for Materials Research and Education

将在扫描电子显微镜（SEM）中开发一个集成传输系统，以执行传输现象的光学成像。该系统将通过与自由电荷重组相关的发光空间成像，提供载流子扩散和漂移、电荷注入和低维结构中的输运的直接成像。扫描电镜内的传输成像可以应用于任何具有发光特征的材料，并将实现光学系统难以获得的空间分辨率和控制。该系统将具有可变温度（300至5k）能力，并结合了扫描电镜和阴极发光成像选项。内部近场光学系统将分辨率限制扩展到~ 50 nm。利用这种新能力，在量子线中的输运、输运参数的无接触测量、近接触行为和宽禁带材料的输运研究等领域进行了研究。该仪器将通过将本科生和研究生、教师和工业科学家聚集在一起，促进研究和教育的整合。这笔拨款将支持加州大学伯克利分校现有的针对代表性不足群体的外展工作，并为海军研究生院（NPS）代表美国军方所有分支机构和广泛的国际社会的不同学生提供独特的互动机会。将开发一个集成传输系统，以允许直接成像自由电荷（例如电子）的运动，在为光电应用而设计的材料中。该系统将结合两种显微镜（扫描电子显微镜（SEM）和光学显微镜），能够直接成像由于扩散和在电场中运动的电子运动。这些现象是所有光子源和探测器操作的核心。这项技术的工作原理是对自由电荷重组时发出的光进行成像，可以应用于任何在电子束激发下发光的材料。该项目的一个主要目标是将现有的传输成像能力扩展到表征纳米技术结构所需的高分辨率（~ 50纳米）。这将通过引入近场光学来实现，它允许超越衍射施加的正常限制的分辨率。使用新设备的研究将在量子线、太阳能电池材料和用于生化传感的新型半导体材料上进行。通过将本科生和研究生、教师和工业科学家聚集在合作项目中，该仪器将有助于研究和教育的整合。这笔拨款将支持加州大学伯克利分校现有的针对代表性不足群体的外展工作，并为海军研究生院代表美国军方所有分支机构和广泛的国际社会的不同学生提供独特的互动机会。

An Integrated Transport System will be developed in a scanning electron microscope (SEM) to perform optical imaging of transport phenomena. The system will provide direct imaging of carrier diffusion and drift, charge injection and transport in low dimensional structures via the spatial imaging of luminescence associated with free charge recombination. Transport imaging within the SEM can be applied to any material with a luminescent signature and will achieve spatial resolution and control that is difficult to obtain with optical systems. The system will have variable temperature (300 to 5 K) capability and combined options for SEM and cathodoluminescence imaging. An internal near-field optical system will extend the resolution limit to ~ 50 nm. Research is proposed, using this new capability, in the areas of transport in quantum wires, contact-free measurements of transport parameters, near-contact behavior and transport studies in wide bandgap materials. The instrument will contribute to the integration of research and education by bringing together undergraduate and graduate students, faculty and industrial scientists. The grant will support existing outreach efforts to underrepresented groups at UC Berkeley and provide unique opportunities for interaction with diverse students at the Naval Postgraduate School (NPS) representing all branches of the US military and a broad international community. An Integrated Transport System will be developed to allow for direct imaging of the motion of free charge (e.g. electrons) within materials designed for optoelectronic applications. The system will combine two microscopes (a scanning electron microscope (SEM) and an optical microscope) to enable the direct imaging of electron motion due to diffusion and to movement in an electric field. These phenomena are at the heart of the operation of all photon sources and detectors. The technique works by imaging the light emitted when free charges recombine and can be applied to any material that emits light under electron beam excitation. One primary goal of the project is to extend the existing capability of transport imaging to the high resolutions (~ 50 nm) needed for characterization of nanotechnology structures. This will be done by introducing near-field optics, which allow for resolution beyond the normal limits imposed by diffraction. Research using the new equipment will be performed on quantum wires, solar cell materials, and newer semiconductor materials for application to biochemical sensing. The instrument will contribute to the integration of research and education by bringing together undergraduate and graduate students, faculty and industrial scientists in collaborative projects. The grant will support existing outreach efforts to underrepresented groups at UC Berkeley and provide unique opportunities for interaction with diverse students at the Naval Postgraduate School representing all branches of the US military and a broad international community.