Isomerization of two-dimensional non-fullerene electron acceptor materials for developing high-performance organic solar cells

Abstract

Three isomeric 2D NFA materials were constructed by one 2D core and four end groups, which implies that the isomerism of conjugated backbone is also an efficient method to turn the optoelectronic properties of NFA materials.

Two-Dimensional Central Fused Ring Enabled High-Performance Quad-Rotor-Shaped Nonfullerene Acceptor Materials

“…The results show that for 2DC-ICH, 2DN-ICH, 2DO-ICH, and 2DS-ICH, the surface areas are, respectively, 416, 420, 418, and 416 Å 2 , which are larger than that of Y6 (375 Å 2 ). 15 This finding suggests that when the 2D NFAs acquire an electron, the delocalization space will be greater than that of Y6, thus facilitating electron transport between neighboring molecules.…”

“…Therefore, increasing the number of π–π stacking interactions between end groups can efficiently enhance their electron mobility. In our previous research, − we demonstrated that utilizing a two-dimensional (2D) fused-ring core with four end groups can efficiently enhance the absorption, reduce the exciton binding energy, and improve the electron mobility. While the size and isomerization of 2D fused-ring cores have been extensively studied, there remains a lack of research on different types of 2D fused-ring cores.…”

On the relationship of the effective mobility and photoconductance mobility in organic solar cells

“…[25][26][27] Furthermore, numerous different synthetic strategies have been employed and investigated in search for viable NFAs in the past. [28][29][30][31][32][33] Organic solar cells typically have a twocomponent active layer in a bulk-heterojunction (BHJ) configuration, consisting of a donor and acceptor material with a large donor-acceptor (D:A) interface (cf. Fig.…”