1250951-96-2Relevant academic research and scientific papers
Dialkylthienosilole and N-alkyldithienopyrrole-based copolymers: Synthesis, characterization, and photophysical study
El-Shehawy, Ashraf A.,Abdo, Nabiha I.,El-Hendawy, Morad M.,Abdallah, Abdul-Rahman I.A.,Lee, Jae-Suk
, (2020/03/04)
We synthesized and characterized a set of D-π-A conjugated copolymers containing thiophene π-bridge. While benzothiadiazole serves as an acceptor (A) unit, the 4,4-dialkyldithieno[3,2-b:2′,3′-d]silole (DTSi) or N-alkyldithieno[3,2-b:2′,3′-d]pyrrole (DTP) act as a donor (D) unit. The copolymers were synthesized via the commonly Stille cross-coupling reaction and exhibited molecular weights of 18.6 to 31.3 kg/mol. The main structural differences among the copolymers are the type of donor moiety (DTSi or DTP) and the position of hexyl side chains on the thiophene π-bridge units between the D and A moieties. The ultimate goal of this work is to explore the effect of three structural factors that could control the photophysical properties of polymers in order to help in the rational design of polymers having specific properties used in optoelectronic devices. The physical properties include thermal stability, photophysical, and electrochemical properties. The structural factors are (a) the power of donor moiety, (b) the position of alkyl side chain on the thiophene π-bridge, and (c) the nature of the alkyl side chain. Also, we utilized the density functional theory calculations to calculate the geometric and electronic structures. A good agreement was remarked between the experimental and theoretical findings.
Monodispersed vs. polydispersed systems for bulk heterojunction solar cells: The case of dithienopyrrole/anthracene based materials
Grisorio, Roberto,Allegretta, Giovanni,Suranna, Gian Paolo,Mastrorilli, Piero,Loiudice, Anna,Mazzeo, Marco,Gigli, Giuseppe,Rizzo, Aurora
, p. 19752 - 19760,9 (2020/08/31)
The article reports on the properties of a new class of arylene-ethynylene semiconductors incorporating anthracene and the bridged bithiophene dithienopyrrole. Two monodispersed structures were synthesised: the first with a dithienopyrrole core bound to two anthracenyl-ethynyl side groups namely the 2,6-bis(anthracen-9-ylethynyl)-4-(2-ethylhexyl)-4H-dithieno[3,2-b:2′, 3′-d]pyrrole (ADA); in the second structure the anthracene core was functionalised with two dithienopyrrolylethynyl groups, obtaining 9,10-bis((4-(2-ethylhexyl)-4H-dithieno[3,2-b:2′,3′-d]pyrrol-2-yl) ethynyl)anthracene (DAD). The properties of these materials were compared with those of the corresponding polymer: poly[4-(2-ethylhexyl)-4H-dithieno[3,2-b: 2′,3′-d]pyrrole-2,6-diylethynylene-anthracen-9,10-diylethynylene] (polyAD). Devices employing PC61BM as an electron acceptor revealed that the monodispersed materials (ADA and DAD) were better performing than polyAD, seemingly due to the better homogeneity of the donor-acceptor blend, as revealed by AFM. The PCE value (1.3%) obtained with DAD ranks among the highest reported for non-polymeric small molecule-based BHJ solar cells constructed without the use of additives or annealing processes, thus demonstrating that ethynylene-containing electron-rich systems are promising donors for organic solar cell applications.
