Ethylene glycol-containing ammonium salt for developing highly compatible interfaces in perovskite solar cells

•An ethylene glycol-modified passivator was developed for perovskite solar cells.•New passivator provided compatible surfaces with various hole transport materials.•Efficiencies over 24 % was obtained with doped hole transport material.•Efficiencies over 22 % was achieved with dopant-free hole transport material.•The interfaces were characterized by collection efficiency simulation.