Perovskite Solar\nCells Made by a Self-Quenching Method\nUsing a Volatile Perovskite Ink with Safer Alternatives to 2‑Methoxyethanol

Four solvents from the glycol ether (GE) family were\nevaluated\nas safer alternatives to the highly toxic 2-methoxyethanol (2ME) used\nfor the fabrication of perovskite solar cells (PSCs). A self-quenching\nprocess by spin-coating the acetonitrile (ACN)-based ink for 7 s was\ndeveloped. The influence of the ACN:GE ratio on the coverage of perovskite\nlayers and cell efficiency was investigated to find that with the\nACN:GE ratio of 8:1 the four solvents studied here can produce PSCs\nwith an efficiency similar to 2ME and therefore can be used as a replacement\nfor the latter.