Fabrication of an ultrathin PEG-modified PEDOT:PSS HTL for high-efficiency Sn–Pb perovskite solar cells by an eco-friendly solvent etching technique

We have creatively introduced an eco-friendly solvent etching techniques to prepare ultra-thin PEDOT:PSS layers modified with PEG. The PCE of Sn–Pb PSCs using PEG-PEDOT:PSS HTL is increased from 20.52% to 21.58%, and the stability of the device is also improved.