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Exploiting the Lability of Metal Halide Perovskites for Doping Semiconductor Nanocomposites.

ABSTRACT: Cesium lead halides have intrinsically unstable crystal lattices and easily transform within perovskite and nonperovskite structures. In this work, we explore the conversion of the perovskite CsPbBr₃ into Cs₄PbBr₆ in the presence of PbS at 450 °C to produce doped nanocrystal-based composites with embedded Cs₄PbBr₆ nanoprecipitates. We show that PbBr₂ is extracted from CsPbBr₃ and diffuses into the PbS lattice with a consequent increase in the concentration of free charge carriers. This new doping strategy enables the adjustment of the density of charge carriers between 10¹⁹ and 10²⁰ cm^-3, and it may serve as a general strategy for doping other nanocrystal-based semiconductors.

SUBMITTER: Calcabrini M

PROVIDER: S-EPMC7887873 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature

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Exploiting the Lability of Metal Halide Perovskites for Doping Semiconductor Nanocomposites.

Calcabrini Mariano M Genç Aziz A Liu Yu Y Kleinhanns Tobias T Lee Seungho S Dirin Dmitry N DN Akkerman Quinten A QA Kovalenko Maksym V MV Arbiol Jordi J Ibáñez Maria M

ACS energy letters 20210121 2

Cesium lead halides have intrinsically unstable crystal lattices and easily transform within perovskite and nonperovskite structures. In this work, we explore the conversion of the perovskite CsPbBr3 into Cs4PbBr6 in the presence of PbS at 450 °C to produce doped nanocrystal-based composites with embedded Cs4PbBr6 nanoprecipitates. We show that PbBr2 is extracted from CsPbBr3 and diffuses into the PbS lattice with a con ...[more]

PMID: 33614964

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