New Donor-Acceptor polymers with a wide absorption range for photovoltaic applicationsстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 7 июля 2020 г.
Аннотация:For conjugated polymers of interest in photovoltaic applications, control of the bandgap as well as the energylevels of the molecules are of great importance to improve the efficiency and performance of the resultingpolymer solar cells. A general tactic for adjusting these properties via modification of the conjugated polymerstructure is by using different and chosen molecular groups for copolymerization. This communication presentsthe synthesis of conjugated donor–acceptor type polymers that have the same benzotrithiophene (BTT) donorand different acceptor units, i.e. DPP andfluoro-carbazole substituted thieno[3,4-b]pyrazine (FCTP) denoted asP(BTT-DPP) (P1) and P(BTT-FCTP) (P2), respectively, and their photovoltaic performance using as donor, andnon-fullerene acceptor (PDIF) in the bulk heterojunction active layer. The bandgaps as well as the HOMO andLUMO energy levels are effectively tuned. The P(BTT-FCTPZ) structure exhibits a smaller bandgap as comparedto P(BTT-DPP) that results from the lower LUMO energy and higher HOMO energy due to the FCTP unit. Havingoptimized the active layers, the PSCs that were based on P(BTT-DPP) and P(BTT-FCTPZ gave an overall powerconversion efficiency of about 9.77% and 10.97%, respectively, using a wide bandgap PDIF non-fullerene ac-ceptor, and 8.38% and 9.05, respectively, using PC71BM as electron accept