182483-20-1Relevant academic research and scientific papers
Efficient organic photovoltaic cells based on thiazolothiazole and benzodithiophene copolymers with π-conjugated bridges
Park, Junhoo,Park, Jong Baek,Ha, Jong-Woon,Park, Hea Jung,Kang, In-Nam,Hwang, Do-Hoon
, p. 1978 - 1988 (2018)
New donor–π–acceptor (D–π–A) type conjugated copolymers, poly[(4,8-bis((2-hexyldecyl)oxy)benzo[1,2-b:4,5-b′]dithiophene)-alt-(2,5-bis(4-octylthiophen-2-yl)thiazolo[5,4-d]thiazole)] (PBDT-tTz), and poly[(4,8-bis((2-hexyldecyl)oxy)benzo[1,2-b:4,5-b′]dithiophene)-alt-(2,5-bis(6-octylthieno[3,2-b]thiophen-2-yl)thiazolo[5,4-d]thiazole)] (PBDT-ttTz) were synthesized and characterized with the aim of investigating their potential applicability to organic photovoltaic active materials. While copolymer PBDT-tTz showed a zigzagged non-linear structure by thiophene π-bridges, PBDT-ttTz had a linear molecular structure with thieno[3,2-b]thiophene π-bridges. The optical, electrochemical, morphological, and photovoltaic properties of PBDT-tTz and PBDT-ttTz were systematically investigated. Furthermore, bulk heterojunction photovoltaic devices were fabricated by using the synthesized polymers as p-type donors and [6,6]-phenyl-C71-butyric acid methyl ester as an n-type acceptor. PBDT-ttTz showed a high power conversion efficiency (PCE) of 5.21% as a result of the extended conjugation arising from the thienothiophene π-bridges and enhanced molecular ordering in the film state, while PBDT-tTz showed a relatively lower PCE of 2.92% under AM 1.5 G illumination (100 mW/cm2).
