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7271946 
Journal Article 
Benzodifuran and benzodithiophene donor-acceptor polymers for bulk heterojunction solar cells 
Huang, P; Stefan, MC; Biewer, MC; Du, Jia; Gunathilake, SS; Rainbolt, EA; Murphy, JW; Black, KT; Barrera, D; Hsu, JWP; Gnade, BE; , 
2015 
1 
Journal of Materials Chemistry A
ISSN: 2050-7488
EISSN: 2050-7496 
ROYAL SOC CHEMISTRY 
CAMBRIDGE 
6980-6989 
WOS:000351552300035 
Four new donor-acceptor copolymers were synthesized by using benzo[1,2-b: 4,5-b']dithiophene and benzo[1,2-b: 4,5-b'] difuran as donors and thieno[3,4-b] thiophene was used as the acceptor building block. A systematic study was performed to determine the influence of the combinations of different heteroatoms in the donor-acceptor copolymer. In bulk heterojunction solar cells, the polymer with all furan building blocks in the electron donating units, poly[(4,8-bis(5-dodecyl-2-furanyl) benzo[1,2-b: 4,5-b'] difuran-2-yl)-alt-(2-ethyl-1-(3-fluorothieno[3,4-b] thiophen-2-yl)-1-hexanone)] (P4) (M-n = 66.7 kDa), achieved the highest power conversion efficiency of 5.23%.