Synthesis and photoactivity of chemically asymmetric polymeric porphyrin films made by interfacial polymerization

Planarized Star‐Shaped Oligothiophenes as a New Class of Organic Semiconductors for Heterojunction Solar Cells

“…Thus, for compound 2, the passage from the solution to the solid-state produces an hypsochromic shift of k max to 319 nm and the emergence of a weak new transition at 417 nm. This splitting of the singlet excited state already observed for nTs and oligothienylenevinylenes (nTVs), [12,17] has been attributed to the exciton interactions between adjacent molecules in a closepacked organization. As shown already, for both nTs and nTVs, these spectral features are associated with a vertical orientation of the molecules on the surface of the substrate.…”

“…[1,3,7,11] Thus, conversion efficiencies exceeding 1 % have been reported for solar cells based on phthalocyanines and acceptors derived from perylene or fullerenes C 60 . [1,3,7,11] Whereas thiophene-based p-conjugated oligomers have been widely investigated as organic semiconductors for application in organic field-effect transistors (OFETs), [12] their possible use in solar cells has attracted less attention. [13,14] It is well known that a vertical orientation of the p-conjugated chains on the surface of the substrate favors high hole mobility in the corresponding OFETs.…”

“…[13,14] It is well known that a vertical orientation of the p-conjugated chains on the surface of the substrate favors high hole mobility in the corresponding OFETs. [12] Conversely, a large absorption of the incident light required for efficient PV conversion implies that the dipole of the chromophore is perpendicular to the direction of the incident light and hence parallel to the surface of the substrate. This problem has been analyzed by Fichou and co-workers, who have shown that alignment of octithiophene molecules parallel to the surface of the substrate produces a substantial improvement in power conversion efficiency of the resulting solar cells.…”

Metalloporphyrins—Applications and clinical significance

“…Porphyrins have been incorporated into polymers as pendant groups, in the backbone of networks (36) and linear polymers and as coordination polymers. Thin films for catalysis studies have been prepared on electrodes by electropolymerization (37,38).…”

Free-Energy-Driven Transfer of Charge in Dense Electrochemically Active Monomolecular Films

“…Even though the σ-coupling is efficient within macro-chains 11 or thick films 12 , the ways of creating extended continuous σ-coupled 2D networks are yet to be found. Despite that π-and through space couplings provide smaller range for the single-barrier tunneling 13 than the σ-coupling 9,10 , the multistep electron transfer through the π-stacked purine strands of DNA has proved itself efficient 6,14,15 .…”