UNAM Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Ankara, Turkey.
ACS Nano. 2010 Apr 27;4(4):1851-60. doi: 10.1021/nn9014196.
We report characterization of photovoltaic and photoconductivity effects on nanostructured surfaces through light induced changes in the X-ray photoelectron spectra (XPS). The technique combines the chemical specificity of XPS and the power of surface photovoltage spectroscopy (SPV), with the addition of the ability to characterize photoconductivity under both static and dynamic optical excitation. A theoretical model that quantitatively describes the features of the observed spectra is presented. We demonstrate the applicability of the model on a multitude of sample systems, including homo- and heterojunction solar cells, CdS nanoparticles on metallic or semiconducting substrates, and carbon nanotube films on silicon substrates.
我们通过 X 射线光电子能谱（XPS）中光诱导的变化来报告对纳米结构表面的光伏和光电导效应的特性。该技术结合了 XPS 的化学特异性和表面光电压谱（SPV）的优势，并且还具有在静态和动态光激发下对光电导性进行表征的能力。我们提出了一个定量描述所观察到的光谱特征的理论模型。我们通过多种样品系统证明了该模型的适用性，包括同质结和异质结太阳能电池、金属或半导体衬底上的 CdS 纳米粒子以及硅衬底上的碳纳米管薄膜。
