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Nitroxide mediated controlled radical polymerization (NMRP) and Grignard metathesis polymerisation (GRIM) are used for diverse polymer chitecture guaranteeing control in molecular weight, low polydispersity and variable composition.
Examples are
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Side-chain crystalline poly(perylene bisimides): PPerAcr |
Side-chain amorphous triphenylamines: PvTPAs |
Main-chain conjuated polymers: Poly(3-hexylthiophene) (P3HTs) |
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PS-block-amorphous-crystalline PPerAcr: | PS-block-PvTPAs amorphous-crystalline | PS-block-P3HT, PtBA-block-P3HT: crystalline-amorphous |
PvTAA-block-PPerAcr: amorphous-crystalline
P3HT-block-PPerAcr (crystalline-crystalline)
In the field of n-type semiconductors, diverse structures of perylene bisimides were developed using unsymetrical substitution of perylene bisimide core resulting in crystalline, liquid crystalline and hydrogen bonding derivatives.
In the field of light harvesting dyes for applications in solar cells secondary donor antenna groups are introduced to improve absorption and to retard recombination kinetics.
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N 719 | Ru-TPA | Ru-TPD |
Improvement in absorption as well as retardation of recombination