<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "Work Function Tuning at Interfaces by Monomolecular Films"^^ . "The control over the work function of surfaces and interfaces is one of the most\r\nimportant issues of modern surface science and nanotechnology, e.g. in context\r\nof organic electronics and photovoltaics. The goal of this work was to look for\r\nnew ways to control the work function of metal substrates by using molecular\r\nself-assembly. Two different strategies were used. The first strategy was to use\r\naliphatic and aromatic molecules which contain an embedded dipolar group (midchain\r\nfunctionalization). Such self-assembled monolayers (SAMs) allow for tuning\r\nthe substrate work function in a controlled manner, independent of the docking\r\nchemistry and, most importantly, without modifying the SAM-ambient interface.\r\nIn the case of aliphatic films, we used alkanethiols functionalized with an embedded\r\nester dipole, with the length of both top and bottom segments as well as the\r\ndirection of the embedded dipole being varied. In the case of aromatic systems, we\r\nused terphenyl based thiols functionalized with an embedded pyrimidine dipolar\r\ngroup, with the direction of the dipole being varied. The electronic and structural\r\nproperties of these embedded-dipole SAMs were thoroughly analyzed using\r\na number of complementary characterization techniques combined with quantummechanical\r\nmodeling. It is shown that such mid-chain-substituted monolayers\r\nare highly interesting from both fundamental and application viewpoints, as the\r\ndipolar groups are found to induce a potential discontinuity inside the monolayer,\r\nelectrostatically shifting the core-level energies in the regions above and below the\r\ndipoles relative to one another. Particularly imptortant, in context of the present\r\nwork, is the fact that the mid-chain functionalized films are indeed well suited to\r\nadjust the work function of metal substrates. This could be e.g. done by varying\r\nthe orientation of the dipolar group but also by mixing the molecules with\r\ndifferently oriented dipoles as was demonstrated in the present work. Within the\r\nsecond strategy, we used photoresponsive systems, viz. azobenzene substituted\r\nalkanethiols, having a specially designed architecture to control the packing density\r\nand carrying an additional dipolar tail group. These novel SAMs were studied\r\nin detail by using spectroscopic and microscopic techniques. Performing photoisomerization\r\nexperiments we obtained a reproducible, stimuli-responsive change in\r\nthe work function which was, however, limited to some extent due to the strong\r\nsteric hindrance effects. In order to reduce these effects, we diluted the azobenzene\r\nmolecules with short spacer molecules, which resulted in an improvement in the\r\nphotoswitching behavior."^^ . "2015" . . . . . . . "Swen"^^ . "Schuster"^^ . "Swen Schuster"^^ . . . . . . "Work Function Tuning at Interfaces by Monomolecular Films (PDF)"^^ . . . "PhD_Thesis_Swen_Schuster.pdf"^^ . . . "Work Function Tuning at Interfaces by Monomolecular Films (Other)"^^ . . . . . . "indexcodes.txt"^^ . . . "Work Function Tuning at Interfaces by Monomolecular Films (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "Work Function Tuning at Interfaces by Monomolecular Films (Other)"^^ . . . . . . "preview.jpg"^^ . . . "Work Function Tuning at Interfaces by Monomolecular Films (Other)"^^ . . . . . . "medium.jpg"^^ . . . "Work Function Tuning at Interfaces by Monomolecular Films (Other)"^^ . . . . . . "small.jpg"^^ . . "HTML Summary of #19776 \n\nWork Function Tuning at Interfaces by Monomolecular Films\n\n" . "text/html" . . . "530 Physik"@de . "530 Physics"@en . . . "540 Chemie"@de . "540 Chemistry and allied sciences"@en . .