Layered organic-inorganic perovskites having metal-deficient inorganic frameworks
AssigneeInternational Business Machines Corporation
InventorDavid Brian Mitzi
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Abstract
An organic-inorganic perovskite having alternating layers of an inorganic anion layer and an organic cation layer is provided. More particularly, the inorganic anion layer of the organic-inorganic perovskite has a trivalent or higher valent metal halide framework and the organic cation layer has a plurality of organic cations capable of templating the metal-deficient inorganic anion layers within the perovskite structure. Methods of preparing the organic-inorganic perovskite according to the present invention are also provided.
Claims23
An organic-inorganic perovskite, comprising alternating layers of:
- an inorganic anion layer having a metal-deficient framework of corner-sharing metal halide octahedra, wherein said metal has a valence n of greater than 2, said metal halide layer being represented by the formula:
- (Mn+)2/nV(n−2)/nX42−
- wherein M is a metal;
- V is a vacancy;
- X is a halide;
- and n is an integer greater than 2;
- and
- an organic cation layer having a plurality of organic cations capable of templating said metal-deficient inorganic anion layers within the perovskite structure.
A method of preparing an organic-inorganic perovskite having alternating inorganic anion and organic cation layers, said method comprising the steps of:
- (a) contacting (i) a hydrogen halide salt of an organic diamine and (ii) a metal halide having a metal valence greater than 2, wherein said contacting is carried out in the presence of a solvent and hydrogen halide to produce a solution;
- and
- (b) supersaturating said solution to precipitate said perovskite.
A method of preparing an organic-inorganic perovskite having alternating inorganic anion and organic cation layers, said method comprising the step of:
- contacting (i) a hydrogen halide salt of an organic diamine and (ii) a metal halide having a metal valence greater than 2, wherein said contacting is carried-out at a temperature and for a length of time sufficient to produce a perovskite.
Dependencies are inferred from the claim text.