Synthesis and characterization of an anthracene-based low band gap polymer for photovoltaic devices.
We have synthesized an anthracene-based conjugated polymer, poly[(9,10-bis(oct-1-ynyl)anthracene)-alt-(5,6-bis(octyloxy)-4,7-bis(thiophen-2-yl)benzo-[c][1,2,5]-thiadiazole)] (PANTBT), for application in organic photovoltaic devices. It exhibited a number average molecular weight of 14,300 g/mol and was fairly soluble in chlorinated organic solvents due to flexible octynyl- and octyloxy side chains on the anthracene and benzothiadiazole moieties. PANTBT showed absorption covering 300-660 nm. Through the bond alternation between the electron-sufficient anthracene (and thiophene) and electron-deficient benzothiadiazole units, a band gap of PANTBT was decreased to 1.89 eV, showing a deep HOMO level of -5.31 eV. As a result, PANTBT exhibited promising photovoltaic properties with a PCE value of 1.90% (VOC = 0.77 V, JSC = -6.50 mA/cm2, FF = 0.38) upon blending with PC71, BM under AM 1.5G.
In Hwan
IH
Jung
Hoyeon
H
Kim
Wonho
W
Lee
Byung Jun
BJ
Jung
Han Young
HY
Woo
Seunghyup
S
Yoo
Hong-Ku
HK
Shim
D000873:Anthracenes / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D010777:Photochemistry; D011108:Polymers / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization; D013056:Spectrophotometry, Ultraviolet
D000873:Anthracenes; D011108:Polymers; C034020:anthracene