Thiazolothiazole-containing polythiophenes with low HOMO level and high hole mobility for polymer solar cells
(4875–4885)Journal of Polymer Science Part A: Polymer  Chemistry 49 #22 (2011)
Shi et al of theChinese Academy of Sciences, China, synthesized two regiochemically defined polythiophenes containing thiazolothiazole acceptor unit by palladium(0)-catalyzed Stille coupling reaction.  Polymer solar cells (PSCs) were fabricated based on the blend of the polymers and methanofullerene[6,6]-phenyl C71-butyric acid methyl ester (PC71BM). The PSC based on P1:PC71BM (1:2, w/w) exhibits a power conversion efficiency of 2.7% under AM 1.5, 100 mW cm−2, two times of that based on P2:PC71BM. The higher efficiency is attributed to lower HOMO (−5.6 eV) and smaller phase separation scale in P1:PC71BM blend. (RDC 10/13/2011)