Efficient Ternary Organic Solar Cells with Two Compatible Non‐Fullerene Materials as One Alloyed Acceptor

Abstract

Efficient ternary organic solar cells (OSCs) are fabricated by employing a polymer PBT1‐C as the donor and two non‐fullerene materials, MeIC and MeIC2, as one alloyed acceptor. The optimized ternary OSCs with 30 wt% MeIC2 in acceptors achieve a power conversion efficiency (PCE) of 12.55%, which is much higher than that of 11.47% for MeIC‐based binary OSCs and 11.41% for MeIC2‐based binary OSCs. The >9.4% improvement in PCE is mainly attributed to the optimized photon harvesting and morphology of ternary active layers, resulting in the simultaneously improved short‐circuit current and fill factor. Furthermore, good compatibility and similar lowest unoccupied molecular orbital energy levels of MeIC and MeIC2 are beneficial to form one alloyed acceptor for efficient electron transport in the ternary active layers. This work may provide new insight when selecting the third component for preparing efficient ternary OSCs.

Recent Progress on Photomultiplication Type Organic Photodetectors

“…The spectral response range of PM type OPDs can be extended by using ternary strategy or utilizing narrow bandgap non‐fullerene acceptor . The ternary strategy, as an effective method of achieving high‐efficiency organic solar cells, has been widely employed . The OPDs with broadband response were successfully demonstrated by doping poly[4,8‐bis(5‐(2‐ethylhexyl)thiophen‐2‐yl)benzo[1,2‐b:4,5‐b′]dithiophene‐co‐3‐fluorothieno [3,4‐b]‐thiophene‐2‐carboxylate] (PTB7‐Th) into P3HT:PC 71 BM active layer, and the weight ratios of donors to acceptor are kept constant as 100:1.…”

Benzodithiophenedione-based polymers: recent advances in organic photovoltaics

“…Many reports also presented different working mechanisms of ternary OSCs, such as charge transfer, energy transfer, the alloy-like model, and the parallel-linkage model, etc 64 . For example, Zhang et al developed efficient alloy-like ternary nonfullerene OPVs by utilizing P42 as a donor and two compatible nonfullerene small molecules of M1 and M2 as acceptors 65 . The ternary OPVs with 30 wt% M2 exhibited a higher PCE of 12.55%, which was higher than that of the binary OPVs containing a single acceptor.…”

Versatile Ternary Approach for Novel Organic Solar Cells: A Review

“…Based on the alloy model, a high performance TOSC with a PCE of 12.55% was obtained which is much higher than the counterpart binary OSC (≈11.4%). The enhancement in performance was mainly contributed to the efficient electron transport in the ternary blends which induced by the alloy acceptor …”

“…The enhancement in performance was mainly contributed to the efficient electron transport in the ternary blends which induced by the alloy acceptor. [59] After all, the charge carriers transfer and transport in TOSCs are relatively complex compared with binary solar cells. A deep understanding of the photophysical process in both models is currently still far from accomplished and they need to be studied further.…”