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

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.