Abstract: Disclosed are an organic proton-type ionic liquid, a film with a two-dimensional perovskite pure-phase quantum well structure, a preparation method and use thereof. The organic proton-type ionic liquid has a chemical formula of RNH3+·CH3COO? or RNH3+·RCOO?, where R represents an alkyl group of C4-8 or a phenyl group, preferably, the chemical formula thereof is CH3(CH2)3NH3+·CH3COO?. The organic proton-type ionic liquid can be used to prepare perovskite material, the perovskite film prepared thereby can form a pure-phase single quantum well, with a crystal grain size therein reaching a level of micrometers or even millimeters.

Abstract: Disclosed are a method for synthesizing a perovskite precursor solution of a formamidine-based ionic liquid, a cell device, and a solar cell. The method includes: adding an organic sodium salt and formamidine hydrochloride to ethanol, respectively, stirring to obtain a formamidine hydrochloride solution and a sodium alkyl carboxylate solution; dropwise adding the formamidine hydrochloride solution to the sodium alkyl carboxylate solution, stirring the mixed solution; filtering the reacted mixed solution and extracting a filtrate, performing rotary evaporation to remove ethanol, and performing oscillating washing; performing secondary filtration, extracting a filtrate, and performing rotary evaporation to remove the organic solvent, to obtain an organic acid formamidine ionic liquid; and dissolving lead iodide and formamidine hydriodide into the organic acid formamidine ionic liquid for reaction to obtain the perovskite precursor solution of the formamidine-based ionic liquid.

Abstract: Disclosed are an organic proton-type ionic liquid, a film with a two-dimensional perovskite pure-phase quantum well structure, a preparation method and use thereof. The chemical formula of the organic proton-type alkylamine acetate ionic liquid is RNH3+—RCOO?, where R represents an alkyl group of C4-8 or a phenyl group, preferably, the chemical formula of the organic proton-type alkylamine acetate ionic liquid is CH3(CH2)3NH3+—CH2COO?. The organic proton-type alkylamino acetate ionic liquid disclosed in the present disclosure can be used to prepare perovskite material, the prepared perovskite film thereby can form a pure-phase single quantum well, and the crystal grain size of the film can reach the level of micrometers or even millimeters.