A team of chemists from Kaunas University of Technology (KTU), Lithuania together with physicists from Helmholtz Zentrum Berlin (HZB) science institute, Germany, offers a novel approach for selective layer formation in perovskite solar cells. The molecule, synthesised by the KTU chemists, assembles itself into a monolayer, which can cover a variety of surfaces and can function as an economical hole-transporting material in a perovskite solar cell.