Alliance for Sustainable Energy, LLC

Brown University

Nitin Prabhakar Padture

Kai Zhu

Yuanyuan Zhou

Mengjin Yang

Jinhui Tong

Jue Gong

The present disclosure relates to a composition that includes a perovskite having a stoichiometry comprising AFASnB(IX), where A is a first cation, B is a second cation, X is a halide, and 0.5≤x≤0.9, 0.5≤y≤0.9, and 0≤z≤1. In some embodiments of the present disclosure, A may include at least one of cesium, guanidinium, and/or methylammonium. In some embodiments of the present disclosure, X may include at least one of bromide and/or chloride. In some embodiments of the present disclosure, z may be equal to zero.

Methods for making low bandgap perovskites

An aspect of the present disclosure is a method that includes exchanging at least a portion of a first cation of a perovskite solid with a second cation, where the exchanging is performed by exposing the perovskite solid to a precursor of the second cation, such that the precursor of the second cation oxidizes to form the second cation and the first cation reduces to form a precursor of the first cation.

Methods for producing perovskite halide films

An aspect of the present disclosure is a method that includes applying a solution that includes a first solvent, a halogen-containing precursor, and a metal halide to a substrate to form a coating of the solution on the substrate, contacting the coating with a second solvent to form a first plurality of organo-metal halide perovskite crystals on the substrate, and thermally treating the first plurality of organo-metal halide perovskite crystals, such that at least a portion of the first plurality of organo-metal halide perovskite crystals is converted to a second plurality of organo-metal halide perovskite crystals on the substrate. The halogen-containing precursor and the metal halide are present in the solution at a molar ratio of the halogen-containing precursor to the metal halide between about 1.01:1.0 and about 2.0:1.0, and a property of the second plurality of organo-metal halide perovskite crystals is improved relative to a property of the first plurality of organo-metal halide perovskite crystals.

Organo-metal halide perovskites films and methods of making the same

Methods' and compositions for making coated substrates using a co-solvent method are disclosed. Embodiments of the present disclosure relate in general to methods and compositions for making thin films of organometallic halides. According to one aspect, organometallic halides are deposited from solution on the surface of a substrate at temperatures between about 10 C and 50 C. According to one aspect, organometallic halides are deposited from solution on the surface of a substrate at room temperature.

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Providence, RI, United States of America

Nitin Prabhakar Padture