Synthesis, characterization and application of n-dithieno[3,2-B:2’,3’-D]pyrroles/fluorene derivatives based conjugated molecules/polymers

Semiconducting conjugated materials have attracted intensive interests during recent decades due to their potential applicability in organic electronics, such as organic photovoltaics and organic transistors. The structural modification of conjugated materials significantly influences their optical and electronic properties. This dissertation examined novel conjugated materials based on N-functionalized dithieno[3,2-b:2’,3’-d]pyrrole (DTP) and fluorene derivatives. The study was focused on the preparation and characterization of donor and acceptor (p- and n-type) materials which are potential candidates in organic electronics. For the p-type materials, polymers based on N-functionalized DTP units have been prepared using Stille coupling reactions with good yields in Chapter 3 and 4. Their structures are confirmed by NMR and elemental analyses. They are soluble in common organic solvents such as chloroform and THF. TGA results showed that they have good thermal stability. The investigation of their optical and electrical properties revealed that these polymers (discussed in chapter 3 and chapter 4) are low band gap (