Engineering of the alkyl chain branching point on a lactone polymer donor yields 17.81% efficiency

Abstract

Manipulation of the alkyl chain branching point has emerged as an effective strategy to enhance the performance of conjugated polymers in organic electronic devices. In this work, a highly efficient...

Low-bandgap small molecule acceptors with asymmetric side chains

“…The γ values for L1-S, A1, A2 and S1 are 25.2 mJ m −2 , 26.6 mJ m −2 , 27.7 mJ m −2 and 28.9 mJ m −2 , respectively (Table S14, ESI†). The closer γ values between L1-S and the asymmetric acceptors indicate the lower Flory–Huggins interaction parameters of L1-S:A1 and L1-S:A2 than those of L1-S:S1, 52–55 confirming the higher miscibility between L1-S and the asymmetric acceptors. Therefore, it is reasonable to speculate that the higher donor/acceptor miscibility in L1-S:A1 and L1-S:A2 blend films leads to a lower degree of phase separation, thus leading to finer nanofiber structures and more donor/acceptor interfaces in the active layer.…”

Revisiting the Bithiophene Imide‐Based Polymer Donors: Molecular Aggregation and Orientation Control Enabling New Polymer Donors for High‐Performance All‐Polymer Solar Cells†

“…[ 18 ] The calculations were carried out on three repeat units for each polymer, in which the alkyl chains in BTI or BDT moieties are replaced by methyl groups, isobutyl and propyl, respectively. [ 19 ] The detailed calculation results are shown in Figure S4 and Table S1. As can be seen in Figure 2b and Figure S4, the dihedral angles between thiophene π‐bridge and BTI are 10.73 o — 12.67 o and 11.49 o —12.69 o in G3 and G15, respectively.…”

An over 16% efficiency organic solar cell enabled by a low-cost pyrazine-based polymer donor

“…Compound 1 was synthesized according to the reported work. 35 Compound 2 was obtained by brominating compound 1 with NBS as the bromination agent, and then a nucleophilic substitution reaction was carried out to produce compound 3 . Subsequently, compound 4 was synthesized through coupling 2,5-dibromopyrazine with compound 3 , so as to produce organotin monomer 5 and brominated monomer 6 .…”