Wang, Kai published the artcileSolvent Annealing Effects in Dithieno[3,2-b:2′,3′-d]pyrrole-5,6-Difluorobenzo[c][1,2,5]thiadiazole Small Molecule Donors for Bulk-Heterojunction Solar Cells, Recommanded Product: 2-Bromo-3-(2-ethylhexyl)thiophene, the publication is Chemistry of Materials (2016), 28(15), 5415-5425, database is CAplus.
Low-bandgap small mol. (SM) donors that can be solution-processed with fullerene acceptors (e.g., PC61/71BM) are proving to be particularly promising in bulk-heterojunction (BHJ) solar cells. Compared to their π-conjugated polymer counterparts, SM donors are well-defined (monodisperse) and more synthetically modular, with relatively wide ranges of bandgaps that can be achieved in stepwise couplings of various donor and acceptor motifs. However, the optimization of SM-fullerene morphologies and BHJ device efficiencies relies more specifically on the use of processing additives, postprocessing thermal, or solvent vapor annealing (SVA) approaches, and achieving adequate interpenetrating networks and structural order in BHJ thin films can be challenging. In this report, we examine the correlated effects of mol. structure and postprocessing SVA on the BHJ solar cell performance of a set of π-extended SM donors composed of dithieno[3,2-b:2′,3′-d]pyrrole (DTP) and 5,6-difluorobenzo[c][1,2,5]thiadiazole ([2F]BT) units. In these systems (SM1-SM3), the introduction of addnl. alkyl substituents and unsubstituted thiophene rings on the peripheral unit groups critically impacts the effects of SVA steps on BHJ solar cell efficiency. We show that the more π-extended and alkyl-substituted analog SM3 stands out, with BHJ device efficiencies of ∼6% obtained from SVA with CS2, while SVA-treated SM3-based active layers also show the most favorable ordering and carrier mobility patterns. However, unlike numbers of SM donors reported in recent years, DTP-[2F]BT SM analogs are in general not prone to dramatic performance variations in BHJ thin films cast with processing additives. Our results indicate that the role of SVA steps is not independent of the mol. structure of the SM donors used in the BHJ solar cells.
Chemistry of Materials 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 C3H5F3O, Recommanded Product: 2-Bromo-3-(2-ethylhexyl)thiophene.
Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary