Truxene Functionalized Star-Shaped Non-fullerene Acceptor With Selenium-Annulated Perylene Diimides for Efficient Organic Solar Cells

Abstract

An electron acceptor with a truxene core and ring-fusion perylene diimide (PDI) tripolymer annulated by selenium (Se) branch, named as FTr-3PDI-Se, is designed and synthesized. FTr-3PDI-Se exhibits large conjugated planar conformation, strong absorption spectra in the regions of 300–400 and 450–550 nm, the deep HOMO energy level of 6.10 eV, and high decomposition temperature above 400°C. The FTr-3PDI-Se: PBDB-T-2Cl based device achieved a disappointing power conversion efficiency (PCE) of 1.6% together with a high Voc of 1.12 V. The low PCE was due to the large aggregates of blend film, the imbalanced hole/electron transport and low PL quenching efficiencies. The high Voc can be attributed to the high-lying LUMO level of FTr-3PDI-Se and the low-lying HOMO level of PBDB-T-2Cl. Our research presents an interesting and effective molecule-designing method to develop non-fullerene acceptor.

Recent advancements in perylene diimide as an electron acceptor in organic solar cells

“…Consequently, the resulting PCE of PBDB-T-2Cl:FTr-3PDI-Se is B1.6%. 80 The four PDI acceptors, FhPDI-IO2F, FhPDI-IO2Cl, Fh-PDI-IC2F, and FhPDI-IC2Cl, feature an A-D-A 0 -D-A structure, where A and D represent the acceptor and donor, respectively. Within this structural arrangement, A 0 serves as the central moiety of a graphene-like twisted PDI dimer, known as hPDI, which is selected for its high light absorbance properties.…”

Truxene π-Expanded BODIPY Star-Shaped Molecules as Acceptors for Non-Fullerene Solar Cells with over 13% Efficiency

“…Many star-shaped molecules of truxene have been successfully synthesized and broadly used in optoelectronic fields, i.e., dye-sensitized solar cells, hole-transport layers in perovskite solar cells, , photocatalysts, two-photon absorption materials, , organic light-emitting diodes, and photovoltaic devices. , Additionally, truxene has been effectively used in assembling the electron acceptors for OSCs. Many star-shaped electron acceptors created using the truxene moiety as a core skeleton were reported to construct high-performance NFSMAs. , Therefore, truxene has been proved to be an excellent star-shaped building block for constructing high-performance NFSMA materials.…”

“…Many star-shaped electron acceptors created using the truxene moiety as a core skeleton were reported to construct high-performance NFSMAs. 48,49 Therefore, truxene has been proved to be an excellent star-shaped building block for constructing highperformance NFSMA materials.…”

Truxene-Centered Electron Acceptors for Non-Fullerene Solar Cells: Alkyl Chain and Branched Arm Engineering

“…As the representative multiple branched arms materials, triphenylamine- and porphyrin-centered donors or acceptors have reported high molecular absorption coefficients exceeding 1.0 × 10 5 cm −1 [ 11 , 12 ]. In addition, multiple branched arms materials can balance the aggregation and exciton diffusion to achieve satisfactory electronic communication [ 13 , 14 ]. Meanwhile, for multiple branched arms materials, a suitable planarization and rigidification center is necessary, which not only exhibits horizontal orientation to capture photons, but also enhances π-electron delocalization and accelerates charge transfer property [ 15 ].…”