328092-46-2Relevant academic research and scientific papers
Low-bandgap donor-acceptor copolymers with 4,6-bis(3′-(2-ethylhexyl) thien-2′-yl)thieno[3,4-c][1,2,5]thiadiazole: Synthesis, optical, electrochemical, and photovoltaic properties
Cimrova, Vera,Kminek, Ivan,Pavlackova, Petra,Vyprachticky, Drahomir
, p. 3426 - 3436 (2011)
Two new low-bandgap alternating copolymers (CEHTF and CEHTP) consisting of 4,6-bis(3′-(2-ethylhexyl)thien-2′-yl)thieno[3,4-c][1,2,5] thiadiazole and 9,9-bis(2-ethylhexyl)fluorene or 2,5-bis(isopentyloxy)benzene were synthesized by Suzuki coupling reaction of corresponding comonomers. Their optical, electrochemical, and photovoltaic (PV) properties were studied and are reported. Both the copolymers exhibited long-wavelength absorption covering the whole visible spectral region, which is in CEHTP thin films extended up to near infrared region, ambipolar redox properties, and electrochromism. High-electron affinities and low-optical bandgap values, 1.37 and 1.15 eV, were determined for CEHTF and CEHTP, respectively. PV devices with bulk heterojunction made of blends of copolymers and fullerene derivative [6,6]-phenyl-C61- butyric acid methyl ester ([60]PCBM) were prepared and characterized. Effects of intramolecular charge transfer strength and side-chain nature and length on photophysical properties are discussed.
