Hyperbranched conjugated polymers based on 4,7-di(thiophen-2-yl)benzo[c][1,2,5]thiadiazole for ternary organic solar cells

Hyperbranched Polymers for Organic Semiconductors

“…As shown in Scheme 5d, Luo et al designed an end-modifiable HBP (HBP44) by an AB 2 monomer and carried out the end-modification of HBP44 by substituting the end-Br with a donor group 1-ethynyl-4-methoxybenzene to obtain the end-modified HBP (HBP45). [33] Ternary OPVs were constructed using two similar small molecule acceptors (IDTOTZ and IDTCPT) with HBP44 and HBP45, respectively. HBP45/ IDTCPT/IDTOTZ of terminal modification-based ternary OPV showed an optimal PCE of 4.86 % with V oc of 0.893 V, J sc of 11.71 mA/cm 2 , and FF of 45.18 %, better than devices based on HBP44/IDTOTZ/IDTCPT with PCE of 2.33 %.…”

“…As shown in Scheme 5d, Luo et al . designed an end‐modifiable HBP ( HBP44 ) by an AB 2 monomer and carried out the end‐modification of HBP44 by substituting the end‐Br with a donor group 1‐ethynyl‐4‐methoxybenzene to obtain the end‐modified HBP ( HBP45 ) [33] . Ternary OPVs were constructed using two similar small molecule acceptors (IDTOTZ and IDTCPT) with HBP44 and HBP45 , respectively.…”

Molecular strategy towards ROMP-derived hyperbranched poly(olefin)s featuring various π-bridged perylene diimides

“…For example, on many occasions, the use of HBPs in medicine, magnetic materials, coatings, additives, and supramolecular chemistry has been widely described. [2][3][4][5] The rapid progress in materials science has enabled this class of macromolecules to evolve into new research fields, such as biocompatible nanocomposites in electronics, dye-sensitized solar cells (DSSCs), organic light-emitting diodes (LEDs), organic field-effect transistors (OFETs), organic photovoltaics (OPVs), transistor memory devices, perovskites [6][7][8][9][10] and programmable memory devices. [11][12][13] The structural symmetry and planarity of the conjugated polymer backbone in branched conjugated polymers (BCPs) are able to enhance the electronic communication throughout the material to support the aggregation and formation of nanoparticles.…”

“…In recent years there has been significant interest in the preparation of highly conjugated polymers based on perylene diimide (PDI) building blocks. 8,[19][20][21][22][23][24][25] The use of PDI moiety for the design of HBPs framework to investigate π-π interactions is of great interest. The highly planar structure intrinsically enhances the π-π stacking interactions between planes, which favours the 1D growth of self-assemblies giving rise to supramolecular nanostructures 26 as well as electrical conductivity.…”

“…27 These features combined with the excellent optical, chemical and thermal stabilities, and the highly fused electron deficient core renders the PDI moiety to be a popular building block for optoelectronic applications. 8,[19][20][21][22][23][24][25] However, π-π interactions between the PDI moieties can become problematic from a solubility and processability standpoint. Thus, the performance of PDI based electron accepting systems are hindered by the excessive and uncontrolled molecular aggregation of the PDI moiety, which greatly affects the solubility, phase separation, dissociation and charge transport in polymeric materials.…”