TY - JOUR
T1 - Benzo[1,2-b:4,5-b’]dithiophene-Pyrido[3,4-b]pyrazine Small-Molecule Donors for Bulk Heterojunction Solar Cells
AU - Wolf, Jannic Sebastian
AU - Babics, Maxime
AU - Wang, Kai
AU - Saleem, Qasim
AU - Liang, Ru-Ze
AU - Hansen, Michael Ryan
AU - Beaujuge, Pierre
N1 - KAUST Repository Item: Exported on 2020-10-01
PY - 2016/2/17
Y1 - 2016/2/17
N2 - We report on the synthesis, material properties and BHJ solar cell characteristics of a set of π-conjugated small-molecule (SM) donors composed of benzo[1,2-b:4,5-b′]dithiophene (BDT) and pyrido[3,4-b]pyrazine (PP) units – examining the perspectives of alkyl-substituted PP acceptor motifs in SM designs. In these systems (SM1-4), both the type of side chains derived from the PP motifs and the presence of ring-substituents on BDT critically impact (i) molecular packing, and (ii) thin-film morphologies and charge transport in BHJ solar cells. With the appropriate side-chain pattern, the ring-substituted analogue SM4 stands out: achieving efficiencies of ca. 6.5% with PC71BM, and fine-scale morphologies comparable to those obtained with some of the best-performing polymer donors in BHJ solar cells. 1H-1H DQ-SQ NMR analyses are used to examine the distinct self-assembly pattern of SM4, expected to factor into the development of the BHJ morphology.
AB - We report on the synthesis, material properties and BHJ solar cell characteristics of a set of π-conjugated small-molecule (SM) donors composed of benzo[1,2-b:4,5-b′]dithiophene (BDT) and pyrido[3,4-b]pyrazine (PP) units – examining the perspectives of alkyl-substituted PP acceptor motifs in SM designs. In these systems (SM1-4), both the type of side chains derived from the PP motifs and the presence of ring-substituents on BDT critically impact (i) molecular packing, and (ii) thin-film morphologies and charge transport in BHJ solar cells. With the appropriate side-chain pattern, the ring-substituted analogue SM4 stands out: achieving efficiencies of ca. 6.5% with PC71BM, and fine-scale morphologies comparable to those obtained with some of the best-performing polymer donors in BHJ solar cells. 1H-1H DQ-SQ NMR analyses are used to examine the distinct self-assembly pattern of SM4, expected to factor into the development of the BHJ morphology.
UR - http://hdl.handle.net/10754/594968
UR - http://pubs.acs.org/doi/abs/10.1021/acs.chemmater.5b04726
UR - http://www.scopus.com/inward/record.url?scp=84964786340&partnerID=8YFLogxK
U2 - 10.1021/acs.chemmater.5b04726
DO - 10.1021/acs.chemmater.5b04726
M3 - Article
SN - 0897-4756
VL - 28
SP - 2058
EP - 2066
JO - Chemistry of Materials
JF - Chemistry of Materials
IS - 7
ER -