Photoelectrochemistry and Heterogeneous Photoprocesses at Semiconductors

这个项目是在一般地区的分析和表面 化学和光电化学领域。 这 研究活动继续进行，并扩大了对 电化学和光电化学反应， 半导体电极的表征 在NSF授予CHE-8304666的任期内。 本研究是 提供了对自然的基本见解， 半导体/液体连接和化学和光化学 这些反应可以在这样的节点上进行。 这些 界面体系对应用具有直接意义 例如将太阳能转化为电能和有用化学品 产品、半导体光刻、分析传感器和 非线性光学器件 这项研究强调新的方法 通过扫描半导体界面的特征 隧道显微术和椭圆偏振术，以及尺寸和 颗粒半导体中的掺杂效应。 调查 “综合化学系统”的设计和应用， 半导体、催化剂、敏化剂的定制布置， 氧化还原电对在载体内，具有结构组织， 为了促进所需的光反应， 追求。 这一广泛的研究活动提供了新的基础知识， 半导体中光致电荷转移过程 界面的结构和有序化学的影响 这些过程的效率。 此外，本发明还 这些研究将产生新的光电化学装置 和增强的半导体加工技术 材料.

This project is in the general area of analytical and surface chemistry and in the subfield of photoelectrochemistry. This research activity continues and broadens investigations of electrochemical and photoelectrochemical reactions and the characterization of semiconductor electrodes that were initiated during the tenure of NSF grant CHE-8304666. This research is providing fundamental insights into the nature of the semiconductor/liquid junction and the chemical and photochemical reactions that can be carried out at such junctions. These interfacial systems are of direct significance to applications such as solar energy conversion to electricity and useful chemical products, photoetching of semiconductors, analytical sensors, and nonlinear optical devices. This research stresses new approaches to the characterization of the semiconductor interface by scanning tunneling microscopy and ellipsometry, and the study of size and doping effects in particulate semiconductors. Investigations of the design and application of "integrated chemical systems" having tailored arrangements of semiconductor, catalyst, sensitizer, and redox couples within a support, with structural organization at the micrometer level, to promote desired photoreactions will be pursued. This broad research activity provides new, fundamental knowledge of photoinduced charge transfer processes at semiconductor interfaces and the effects of structure and ordered chemical composition on the efficiency of these processes. Additionally, these studies should give rise to new photoelectrochemical devices and enhanced technologies for the processing of semiconductor materials.