Kim, Ji-Hoon published the artcileHigh open-circuit voltage organic photovoltaic cells fabricated using semiconducting copolymers consisting of bithiophene and fluorinated quinoxaline or triazole derivatives, Quality Control of 303734-52-3, the publication is Synthetic Metals (2014), 88-96, database is CAplus.
Two new alternating copolymers consisting of bithiophene and fluorinated quinoxaline or fluorinated benzotriazole derivatives, namely, poly[{4,4′-bis(2-ethylhexyl)-2,2′-bithiophene-5,5′-diyl}-alt-{6,7-difluoro-5,5-(5,8-di-2-thienyl-2,3-bis(4-octyloxyl)phenyl) quinoxaline}] (PBT-DFDTQX) and poly[{4,4′-bis(2-ethylhexyl)-2,2′-bithiophene-5,5′-diyl}-alt-{4,7-bis(5-thiophen-2-yl)-5,6-difluoro-2-(heptadecan-9-yl)-2H-benzo[d][1,2,3]triazole}] (PBT-DFDTBTz), were synthesized by the Stille cross coupling reaction for application in organic photovoltaic cells. The optical band gaps of PBT-DFDTQX and PBT-DFDTBTz are 1.77 and 1.90 eV, resp. The synthesized polymers showed relatively deep HOMO energy levels (-5.52 eV for PBT-DFDTQX and -5.54 eV for PBT-DFDTBTz) owing to the strong electron accepting nature of F. The polymers were used to fabricate bulk heterojunction photovoltaic devices with [6,6]-Ph C71-butylic acid Me ester (PC71BM) as the electron acceptor. Devices fabricated using PBT-DFDTQX and PBT-DFDTBTz showed the maximum power conversion efficiency (PCE) of 4.01 and 4.22%, resp., with a high open-circuit voltage of over 0.95 V under AM 1.5 G (100 mW/cm2) conditions.
Synthetic Metals published new progress about 303734-52-3. 303734-52-3 belongs to bromides-buliding-blocks, auxiliary class Thiophene,Bromide, name is 2-Bromo-3-(2-ethylhexyl)thiophene, and the molecular formula is C12H19BrS, Quality Control of 303734-52-3.
Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary