Perylene Diimide Hexamer Based on Combination of Direct and Indirect Linkage Manners for Non‐fullerene Organic Solar Cells

Abstract

Perylene diimide (PDI) is one of the most intensively studied building blocks for the construction of non-fullerene acceptors (NFAs). In this contribution, based on combination of the direct and indirect linkage manners of PDI units at the bay position, a propeller-shaped PDI hexamer T-DPDI was designed and synthesized. The singly bonded PDI dimer DPDI and the benzene ring cored PDI trimer TPDI were synthesized for comparison. The photovoltaic performances of these three PDI derivatives were investigated using the commercially available PTB7-Th as electron donor. A best power conversion efficiency (PCE) of 6.58% was obtained for T-DPDI based organic solar cells (OSCs), which is higher than those of DPDI and TPDI based ones. The superior photovoltaic performance of T-DPDI can be ascribed to its stronger absorption and more favorable morphology. This study presents an interesting example of improving the photovoltaic performances of PDI based NFAs by hybridizing the direct and indirect linkage manners.

Perylene-diimide for organic solar cells: current scenario and prospects in molecular geometric, functionalization, and optoelectronic properties

“…Because the constituent PDI monomers of the NFA are rotated in different orientations, the natural aggregation propensity of PDIs is mitigated owing to this strategy. [235][236][237] Additionally, the intermolecular self-aggregation that occurs in BHJ lms can be addressed by constructing twisted threedimensional (3D) molecular geometry, which can reduce unwanted domain sizes in PDI-based fullerene-free OSCs (Fig. 12).…”

“…Because the constituent PDI monomers of the NFA are rotated in different orientations, the natural aggregation propensity of PDI s is mitigated owing to this strategy. 235–237…”

Structural symmetry-breaking of a perylene diimide acceptor at the N-position for enhanced photovoltaic performance

“…Thus, a number of twisted PDI derivatives have been constructed by linking two or more PDI units directly together or with congested spacers. [20][21][22][23][24][25] Based on an exceptional molecular design strategy, Nuckolls and Wang's groups independently reported an exotic series of PDI oligomers that consists of PDI panels fused together by ethylene bridges. [26][27][28] These PDI oligomers exhibit extraordinary n-type mobilities and power conversion efficiencies (PCEs) in OFETs and OSCs, respectively.…”