4 research outputs found
Organic Chromophores in Self-Assembled Monolayers and Supramolecular Arrays
Large aromatic chromophores, e.g. phthalocyanines or perylene derivatives are widely used in modern photonic applications. For these systems, well-organized films of the chromophores are very important. One of the ways to ensure the order on molecular level is to bind the organic dyes covalently to a solid substrate with a suitable anchor group. Expanding the concept, multilayered supramolecular assemblies can be built on surfaces as well.In the present Thesis various chromophores with a capability to anchor onto a solid surface were prepared. Synthesized molecules were porphyrins, phthalocyanines, and perylene mono- and diimides with different substituents. The anchor-surface pairs were of several types, and the chromophores were attached to a surface by one- or two-step methods.Two of the perylene monoimide derivatives were found to be a perfect basement for construction of multilayered films. Using a metal-ligand interaction it was possible to prepare stable double layers, as well ten molecules thick stable deeply colored multilayer films. The developed approach is versatile and will allow in future to expand the capabilities of molecular film architecture
Organic Chromophores in Self-Assembled Monolayers and Supramolecular Arrays
Large aromatic chromophores, e.g. phthalocyanines or perylene derivatives are widely used in modern photonic applications. For these systems, well-organized films of the chromophores are very important. One of the ways to ensure the order on molecular level is to bind the organic dyes covalently to a solid substrate with a suitable anchor group. Expanding the concept, multilayered supramolecular assemblies can be built on surfaces as well.In the present Thesis various chromophores with a capability to anchor onto a solid surface were prepared. Synthesized molecules were porphyrins, phthalocyanines, and perylene mono- and diimides with different substituents. The anchor-surface pairs were of several types, and the chromophores were attached to a surface by one- or two-step methods.Two of the perylene monoimide derivatives were found to be a perfect basement for construction of multilayered films. Using a metal-ligand interaction it was possible to prepare stable double layers, as well ten molecules thick stable deeply colored multilayer films. The developed approach is versatile and will allow in future to expand the capabilities of molecular film architecture
Effect of Hole Transporting Material on Charge Transfer Processes in Zinc Phthalocyanine Sensitized ZnO Nanorods
The photoinduced electron transfer
processes were studied for hybrid
systems consisting of self-assembled monolayer of zinc phthalocyanine
(ZnPc) assembled on ZnO nanorods and a film of organic hole transporting
material (HTM) atop. Polythiophene (P3HT) or Spiro-OMeTAD were used
as HTM. The study was carried out by ultrafast transient absorption
spectroscopy technique with selective excitation of ZnPc at 680 nm
or P3HT at 500 nm. Data analysis revealed that photoexcitation of
ZnPc in the structure ZnO|ZnPc|P3HT results in a fast (1.8 ps) electron
transfer from ZnPc to ZnO, which is followed by a hole transfer from
the ZnPc cation to P3HT roughly in 30 ps. However, in the case of
ZnO|ZnPc|Spiro-OMeTAD structure, the primary reaction upon excitation
of ZnPc is a fast (0.5 ps) hole transfer from ZnPc to Spiro-OMeTAD,
and
the second step is electron injection from the ZnPc anion to ZnO in
roughly 120 ps. Thus, we demonstrate two structurally very similar
hybrid architectures that implement two different mechanisms for photoinduced
charge separation found in dye-sensitized or in organic solar cells