Molecular structure–property engineering for photovoltaic applications: Fluorene-acceptor alternating conjugated copolymers with varied bridged moieties

Synthesis, characterization and photovoltaic properties of platinum-containing poly(aryleneethynylene) polymers with phenanthrenyl-imidazole moiety

“…It is known that the ICT effect can be strengthened with the enhancement of electron-donating ability of donor unit or electron-withdrawing ability of acceptor [50,51]. Therefore, the addition of thiophene unit in P2 could result in more rapid charge transfer from the polymeric main chain to the electronwithdrawing phenanthrenyl-imidazole-tethered side chains and then to PCBM [23].…”

Photo- and electroluminescence in a series of PPV type terpolymers containing fluorene, thiophene and phenylene units

“…For example, intrachain energy transfer, energy migration and conformational relaxation processes in conjugated copolymers are complex phenomena which strongly depend on chemical structure and chain conformation. For polymer with donor and acceptor units, charge separation after excitation is a very efficient process and polymers with these groups are potentially useful in photovoltaics [9,10]. Literature data on conjugated terpolymers report mainly on systems based on Suzuki cross coupling or Yamamoto polycondensations that is, without double bonds between the choromophores.…”

Synthesis and characterization of a thiadiazole/benzoimidazole‐based copolymer for solar cell applications

“…Relative to the absorption spectrum of TDBI unit ( M1 ), the absorption peak of PCTDBI exhibited a red shift of 78 nm that was caused by an increase in the conjugation length and the presence of intramolecular charge transport between TDBI and carbazole units. The longer‐wavelength absorption maximum of PCTDBI was located at 596 nm; this signal appeared at a higher wavelength than that of the corresponding carbazole‐derivative polymer featuring benzothiadiazole segments as the acceptor (545 nm),27 presumably because the presence of the coplanar imidazole structure in the polymer backbone increased the degree of coplanarity which provided a longer effective conjugation length and better intramolecular charge transfer 42, 43. The absorption spectrum of the polymer thin film was red‐shifted related to its solution spectrum, suggesting intermolecular interactions and aggregation in the solid state.…”