De Ratnadip, Bera Anupam, Schmidt Heiner, Neumann Christof, Paa Wolfgang, Gawlik Annett, Turchanin Andrey, Dietzek-Ivanšić Benjamin
Department of Functional Interfaces, Leibniz Institute of Photonic Technology Jena, Albert-Einstein-Strasse 9, 07745, Jena, Germany.
Institute of Physical Chemistry, Friedrich Schiller University Jena, Helmholtzweg 4, 07743, Jena, Germany.
Chemphyschem. 2023 Sep 15;24(18):e202300203. doi: 10.1002/cphc.202300203. Epub 2023 Jul 26.
The effect of roughness and thickness of alumina layers, mimicking the passivation layer commonly used in dye-sensitized photoelectrodes, on the molecular adsorption of P1 dye, 4-(bi(4-(2,2-dicyano-vinyl)-thiophene-2-yl]-phenyl]-aminobenzoic acid) has been studied using surface-sensitive vibrational sum frequency generation(VSFG) spectroscopy. The VSFG spectra reveal the formation of poorly ordered dye layers on relatively rough surfaces where XPS measures a higher dye loading. Furthermore, these poorly ordered dye molecules are responsible for the generation of trapped electronic states as probed by successive photoluminescence (PL) measurements. Surface sensitive VSFG spectroscopy in combination with XPS and PL measurements provide complementary spectral information on ordering of the adsorbed dyes, their density on the surface and electronic states of the adsorbed monolayer which are prerequisite for improving our understanding of molecularly functionalized photoelectrodes and their further development.
通过表面敏感的振动和频产生（VSFG）光谱，研究了模仿染料敏化光电极中常用钝化层的氧化铝层的粗糙度和厚度对P1染料（4-（双（4-（2,2-二氰基乙烯基）-噻吩-2-基]-苯基]-氨基苯甲酸）分子吸附的影响。VSFG光谱揭示了在相对粗糙的表面上形成了无序的染料层，而X射线光电子能谱（XPS）测量显示这些表面上的染料负载量更高。此外，这些无序的染料分子导致了通过连续光致发光（PL）测量所探测到的捕获电子态的产生。表面敏感的VSFG光谱与XPS和PL测量相结合，提供了关于吸附染料的有序性、其在表面的密度以及吸附单层的电子态的互补光谱信息，这些对于增进我们对分子功能化光电极的理解及其进一步发展是必不可少的。
