Highly Efficient Binary Solvent Additive‐Processed Organic Solar Cells by the Blade‐Coating Method

Abstract

Blade-coating, a prototype tool for slot-die coating is a promising technique showing high compatibility with large-area roll-to-roll coating. Here, a high-performance PM6:Y6-based device is fabricated with chlorobenzene (CB) through a novel binary solvent additive (1-chloronaphthalene (CN):diphenyl ether (DPE)). It can be found that the binary solvent additive can improve the crystallinity of the acceptor and forms a better phase separation domain, which would promote the effective separation of charge and inhibit charge recombination. As a result, high power conversion efficiency (PCE) of 15.77% can be achieved with the spin-coating method, which is similar to the best organic solar cells (OSCs) processed with chloroform (CF) solution. Moreover, a blade-coated OSC is also processed with CB and demonstrates a promising PCE of 11.69% with large-area device (1.2 cm 2 ). These results are critical for the large-scale production of highly efficient OSCs.

High Sensitivity of Non‐Fullerene Organic Solar Cells Morphology and Performance to a Processing Additive

“…Routes to overcome such an issue include introducing alternative additives, [55] binary solvent additives, [56] nonvolatile solid additives, and third components as in ternary OSCs. [15,57] For example, we have previously substituted the halogen element Cl in the CN molecule with F or Br to mitigate phase separation in PM6:Y6 OSCs and achieved 17.5% PCE.…”

Binary solvent engineering for small-molecular organic semiconductor crystallization

“…162 Fo et al reported binary solvents composed of 1-chloronaphthalene (CN) and diphenyl ether (DPE) as additives to improve the crystallinity and phase segregation domain of the acceptor material, which in turn inhibits charge recombination and enhances power conversion efficiency. 163 In addition to the organic semiconductors, the binary solvent system has also been studied on other types of semiconductors such as small molecular MoS 2 , and C 60 . For example, Majd et al reported a binary solvent method composed of N,N -dimethylformamide (DMF) and IPA to obtain two-dimensional MoS 2 nanosheets with an enlarged surface area for application in detecting miRNA-155 in breast cancer.…”

Non-halogenated and non-volatile solid additive for improving the efficiency and stability of organic solar cells

“…4,5 Several methodologies, such as thermal annealing (TA), 6 vapor annealing, 7 and processing additives, 8,9 have been developed to achieve a ne morphology with optimal nanoscale phase separation. Among these techniques, the introduction of additives, such as 1,8-diiodooctane (DIO), 10,11 1-chloronaphthalene (CN), 12,13 and diphenyl ether (DPE), 14,15 into the host solvent has been widely employed to optimize the nanomorphology of the active layer because of its facile and efficient processability. The presence of solvent additives with a high boiling point and selective solubility reduces the overaggregation of small-molecule acceptors in photoactive lms, resulting in a favorable BHJ morphology.…”