Mixed organic-inorganic perovskite formulations
AssigneeOxford Photovoltaics Limited
InventorsNicola Beaumont, Brett Akira Kamino, Benjamin Langley, Edward James William Crossland
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Abstract
A formulation for use in the preferential formation of thin films of a perovskite material AMX 3 with a certain required crystalline structure, wherein said formulation comprises two or more compounds which between them comprise one or more first organic cations A; one or more metalcations M; one or more second cations A′; one or more first anions X and one or more second anions X′.
Claims16
A formulation for use in the formation of a light absorbing perovskite material having a general formula (I) of:
- AMX3 (I)
- wherein A is one or more monovalent cations, M is one or more divalent metal cations, and X is one or more halide anions, the formulation comprising two or more compounds which between them comprise:
- the one or more monovalent cations A;
- the one or more divalent metal cations M;
- the one or more halide anions X;
- one or more further monovalent cations A′;
- and
- one or more further halide anions X′;
- wherein the one or more further monovalent cations A′ and the one or more further halide anions X′ are selected to form one or more A′X′-containing compounds which are able to be fully separated from the AMX3 material at a temperature of less than 200° C.
A precursor solution for use to make a perovskite material of the general formula AMX3, said precursor solution comprising a suitable solvent system and two or more compounds which between them comprise one or more first cations A;
- one or more metal cations, M;
- one or more second cations A′;
- one or more first anions X and one or more second anions X′;
- and further wherein the ratio of ions is selected such that A:M:X is 1:1:3, and the amount of and choice of the one or more second cations A′ and second anions X′ is selected to form one or more A′X′-containing compounds which are able to be fully separated from the AMX3 material at a temperature of less than 200° C.
Dependencies are inferred from the claim text.