Institute for Chemical Technology of Inorganic Materials, Johannes Kepler University Linz, Altenberger Str. 69, A-4040 Linz, Austria.
Chemphyschem. 2013 Feb 25;14(3):560-7. doi: 10.1002/cphc.201200656. Epub 2013 Jan 16.
Principles of localised photoelectrochemistry are summarised and an experimental approach is described that allows the performance of the most important photoelectrochemical experiments within a diameter of 100 μm. Various light sources, such as a continuum emitter with a monochromator, LEDs, and lasers are coupled into a multi-mode fibre to illuminate a small spot that is wetted by the electrolyte from a capillary. Reference electrode, counter electrode, and optical fibre are installed in the capillary system. The performance of this system is demonstrated by photocurrent measurements on n-doped Si and p-doped Si as model substrates. A thickness-graded aluminium thin film for partial shadowing on Si proves the applicability for material library investigations in combinatorial materials science. Further experiments demonstrate the possibility of electrical light chopping as well as impedance spectroscopy with subsequent Mott-Schottky analysis for the determination of charge-carrier concentration and type, flat-band potential, and inversion layer formation. Photoelectrochemical scanning droplet cell microscopy (PE-SDCM) is an extremely versatile tool for the screening of water splitting photoelectrodes, the characterisation of photocatalysts, and high throughput characterisation of microgram amounts of new solar cell materials.
局部光电化学的原理被总结，描述了一种实验方法，该方法允许在 100μm 的直径内进行最重要的光电化学实验。各种光源，如带有单色仪的连续发射器、LED 和激光器，被耦合到多模光纤中，以照射由毛细管润湿的小光斑。参考电极、对电极和光纤安装在毛细管系统中。该系统的性能通过 n 型掺杂硅和 p 型掺杂硅作为模型衬底的光电流测量来证明。用于 Si 部分遮光的梯度厚度铝薄膜证明了在组合材料科学中用于材料库研究的适用性。进一步的实验证明了电光斩波以及随后的 Mott-Schottky 分析进行阻抗谱的可能性，用于确定载流子浓度和类型、平带电位和反型层形成。光电化学扫描液滴池显微镜（PE-SDCM）是一种非常通用的工具，可用于筛选水分解光电电极、表征光催化剂以及高通量表征微克量的新型太阳能电池材料。
