AI Article Synopsis
- The study investigates how the roughness and thickness of alumina layers affect the adsorption of P1 dye on dye-sensitized photoelectrodes using vibrational sum frequency generation (VSFG) spectroscopy.
- Results show that on rougher surfaces, dye layers are poorly ordered, correlating with higher dye loading as measured by X-ray photoelectron spectroscopy (XPS).
- The combination of VSFG, XPS, and photoluminescence (PL) measurements reveals essential information about the ordering, density of adsorbed dyes, and their electronic states, which is crucial for enhancing the performance of photoelectrodes.
Article Abstract
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.
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| http://dx.doi.org/10.1002/cphc.202300203 | DOI Listing |
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