Highly efficient polymer solar cells with a thienopyrroledione and benzodithiophene containing planar random copolymer

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Polymer Chemistry, ISSN: 1759-9962, Vol: 9, Issue: 10, Page: 1216-1222

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Kim, Taehyo; Lee, Ji Young; Heo, Jungwoo; Lim, Bogyu; Kim, Jin Young
Royal Society of Chemistry (RSC); The Royal Society of Chemistry; ROYAL SOC CHEMISTRY
Chemical Engineering; Biochemistry, Genetics and Molecular Biology; Materials Science; Chemistry
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article description
We synthesized and characterized a new low band-gap copolymer, PBTTFB, incorporating N-alkylthieno[3,4-c]pyrrole-4,6-dione (TPD) as the acceptor and benzodithiophene (BDT) and (2,5-difluorophenylene)dithiophene as the donor units with S⋯F and S⋯O non-covalent intramolecular interactions. The PBTTFB polymer replaced bis(dodecyloxy)benzo[c][1,2,5]thiadiazole (BT) in P1, a previously reported polymer, with 5-dodecyl-4H-thieno[3,4-c]pyrrole-4,6(5H)-dione and exhibited improved macromolecular planarity and molecular ordering of the molecular structure. UV-vis absorption, electrochemical properties, bulk-heterojuction (BHJ) film morphology, and molecular ordering as well as photovoltaic charaterization derived from PBTTFB were studied and analyzed to explore the effect of the thienopyrroledione unit instead of the benzodithiophene unit in the molecular backbone of the polymer. From photovoltaic charaterization, we obtained an enhanced Jvalue of 14.51 mA cmfrom the PBTTFB polymer compared to the Jvalue of 10.54 mA cmfrom P1 due to improved macromolecular planarity. Furthermore, PBTTFB exhibited the highest PCE of 8.25% by adding DPE as a processing additive due to better interpenetration networks for improving charge transport and collection.