A METHOD OF FORMING A LIGHT ABSORBING PEROVSKITE LAYER FOR A PHOTOVOLTAIC CELL AND A PHOTOVOLTAIC CELL COMPRISING THE LIGHT ABSORBING PEROVSKITE LAYER

摘要

The present disclosure is directed to perovskite materials of the formula ABX₃ formed by simultaneous ion hybridisation via A-site cation hybridisation (metal-organic) and X-site anion hybridisation (halide-pseudohalide) and their use in stable hybrid perovskite based photovoltaic devices. In preferred embodiments the A-site cation hybridisation is done by hybridising formamidinium ion (FA⁺) with either caesium ion (Cs⁺) or rubidium ion (Rb⁺), the X-site anion hybridisation is done by hybridising one of iodide ion (I''), bromide ion (Br") or chloride ion (CI") with one of thiocyanate ion (SCN"), selenocyanate ion (SeCN") or cyanate ion (OCN"). In embodiments the cation B is selected to be Pb²⁺. Additionally contemplated are photovoltaic devices comprising: a substrate; an electron transport layer; a light-absorbing layer comprising the perovskite material of the present disclosure; a hole transport layer; and a contact arrangement.